TY  - CONF
AU  - Džunuzović, Jasna
AU  - Jovanović, Slobodan
AU  - Lechner, Manfred D.
AU  - Vodnik, Vesna
PY  - 2010
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/6711
AB  - Rheological (in solution and in melt) and thermal properties of aliphatic hydroxy-functional Boltorn® hyperbranched polyesters of different pseudo generation were investigated in this work. The obtained results show that 40 wt.% solutions of Boltorn® samples in N-methyl-2-pyrrolidinon exhibit Newtonian behaviour at 30 oC and that zero shear viscosity increases with increase of the  generation number, i.e. molar mass. On the other side, vales of the Tg show only slight increase with increase of the molar mass. Thermal stability of investigated samples increases with increase of the number of generation.
PB  - Society of Physical Chemists of Serbia
C3  - Proceedings - 10th International Conference on Fundamental and Applied Aspects of Physical Chemistry, Physical Chemistry 2010, 21-24 September 2010, Belgrade, Serbia
T1  - Rheological and thermal properties of Boltorn® hyperbranched polyesters
VL  - 2
SP  - 473
EP  - 475
UR  - https://hdl.handle.net/21.15107/rcub_cer_6711
ER  - 

@conference{
author = "Džunuzović, Jasna and Jovanović, Slobodan and Lechner, Manfred D. and Vodnik, Vesna",
year = "2010",
abstract = "Rheological (in solution and in melt) and thermal properties of aliphatic hydroxy-functional Boltorn® hyperbranched polyesters of different pseudo generation were investigated in this work. The obtained results show that 40 wt.% solutions of Boltorn® samples in N-methyl-2-pyrrolidinon exhibit Newtonian behaviour at 30 oC and that zero shear viscosity increases with increase of the  generation number, i.e. molar mass. On the other side, vales of the Tg show only slight increase with increase of the molar mass. Thermal stability of investigated samples increases with increase of the number of generation.",
publisher = "Society of Physical Chemists of Serbia",
journal = "Proceedings - 10th International Conference on Fundamental and Applied Aspects of Physical Chemistry, Physical Chemistry 2010, 21-24 September 2010, Belgrade, Serbia",
title = "Rheological and thermal properties of Boltorn® hyperbranched polyesters",
volume = "2",
pages = "473-475",
url = "https://hdl.handle.net/21.15107/rcub_cer_6711"
}

Džunuzović, J., Jovanović, S., Lechner, M. D.,& Vodnik, V.. (2010). Rheological and thermal properties of Boltorn® hyperbranched polyesters. in Proceedings - 10th International Conference on Fundamental and Applied Aspects of Physical Chemistry, Physical Chemistry 2010, 21-24 September 2010, Belgrade, Serbia
Society of Physical Chemists of Serbia., 2, 473-475.
https://hdl.handle.net/21.15107/rcub_cer_6711

Džunuzović J, Jovanović S, Lechner MD, Vodnik V. Rheological and thermal properties of Boltorn® hyperbranched polyesters. in Proceedings - 10th International Conference on Fundamental and Applied Aspects of Physical Chemistry, Physical Chemistry 2010, 21-24 September 2010, Belgrade, Serbia. 2010;2:473-475.
https://hdl.handle.net/21.15107/rcub_cer_6711 .

Džunuzović, Jasna, Jovanović, Slobodan, Lechner, Manfred D., Vodnik, Vesna, "Rheological and thermal properties of Boltorn® hyperbranched polyesters" in Proceedings - 10th International Conference on Fundamental and Applied Aspects of Physical Chemistry, Physical Chemistry 2010, 21-24 September 2010, Belgrade, Serbia, 2 (2010):473-475,
https://hdl.handle.net/21.15107/rcub_cer_6711 .

TY  - JOUR
AU  - Džunuzović, Jasna
AU  - Jovanović, Slobodan M.
AU  - Lechner, Manfred D.
PY  - 2010
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/728
AB  - In this paper, properties of the commercially available Boltorn® hydroxy-functional aliphatic hyperbranched polyesters of the second, third and fourth pseudo generation, were investigated. Additionally, samples of the third and fourth pseudo generation were fractionated using the precipitation fractionation method to obtain three fractions of each sample, which were also investigated in this paper. According to the results obtained by GPC analysis, molar mass and polydispersity of the investigated Boltorn® hyperbranched polyesters increased with increase of the pseudo generation number. Value of the limiting viscosity number of the investigated samples, determined using the viscosity measurements of dilute solutions of these polymers in N-methyl-2-pyrrolidone, increased with the increase of the pseudo generation number. On the other hand, the value of the limiting viscosity number of the fractions decreased from the first up to the third fraction. The same trend was also observed for the values of the hydrodynamic diameter of parent samples and their fractions, determined by dynamic light scattering using N-methyl-2-pyrrolidone as solvent. The thermal properties of the investigated Boltorn® hyperbranched polyesters were determined by thermogravimetry in nitrogen atmosphere and it has been shown that thermal stability of these samples increased with increase of the pseudo generation number. End hydroxyl groups of the second and third pseudo generation samples were modified with β-alanine to obtain hyperbranched samples soluble in water. That was fully accomplished only for the Boltorn® hyperbranched polyester of the second pseudo generation. On the other hand, it was possible to dissolve the modified sample of the third pseudo generation in water only after adding a small amount of the NaOH.
AB  - U ovom radu prikazani su rezultati ispitivanja tri uzorka Boltorn® hidroksi-funkcionalnih hiperrazgranatih alifatskih poliestara druge, treće i četvrte pseudo generacije, kao i frakcija uzoraka treće i četvrte pseudo generacije. Primenom GPC analize pokazano je da sa povećanjem broja pseudo generacije dolazi do rasta molarne mase ali i polidisperznosti ovih uzoraka. Vrednosti graničnog viskozitetnog broja i hidrodinamičkog prečnika ispitivanih poliestara, određenih u N-metil-2-pirolidonu kao rastvaraču, rastu sa povećanjem broja pseudo generacije, dok kod frakcija ove vrednosti opadaju od prve do treće frakcije. Na osnovu termogravimetrijskih rezultata konstantovano je da termička stabilnost ovih uzoraka raste sa povećanjem broja pseudo- generacije. Modifikovanjem krajnjih hidroksilnih grupa Boltorn® hiperrazgranatog poliestra druge pseudo generacije β-alaninom dobijen je uzorak rastvoran u vodi, dok se uzorak treće pseudo generacije, takođe modifikovan β-alaninom, rastvorio u vodi nakon dodavanja male količine NaOH.
PB  - Association of Chemical Engineers of Serbia
T2  - Hemijska industrija
T1  - Characterization of the commercial hyperbranched polyesters
T1  - Karakterizacija komercijalnih hiperrazgranatih poliestara
VL  - 64
IS  - 6
SP  - 547
EP  - 553
DO  - 10.2298/HEMIND101014060D
ER  - 

@article{
author = "Džunuzović, Jasna and Jovanović, Slobodan M. and Lechner, Manfred D.",
year = "2010",
abstract = "In this paper, properties of the commercially available Boltorn® hydroxy-functional aliphatic hyperbranched polyesters of the second, third and fourth pseudo generation, were investigated. Additionally, samples of the third and fourth pseudo generation were fractionated using the precipitation fractionation method to obtain three fractions of each sample, which were also investigated in this paper. According to the results obtained by GPC analysis, molar mass and polydispersity of the investigated Boltorn® hyperbranched polyesters increased with increase of the pseudo generation number. Value of the limiting viscosity number of the investigated samples, determined using the viscosity measurements of dilute solutions of these polymers in N-methyl-2-pyrrolidone, increased with the increase of the pseudo generation number. On the other hand, the value of the limiting viscosity number of the fractions decreased from the first up to the third fraction. The same trend was also observed for the values of the hydrodynamic diameter of parent samples and their fractions, determined by dynamic light scattering using N-methyl-2-pyrrolidone as solvent. The thermal properties of the investigated Boltorn® hyperbranched polyesters were determined by thermogravimetry in nitrogen atmosphere and it has been shown that thermal stability of these samples increased with increase of the pseudo generation number. End hydroxyl groups of the second and third pseudo generation samples were modified with β-alanine to obtain hyperbranched samples soluble in water. That was fully accomplished only for the Boltorn® hyperbranched polyester of the second pseudo generation. On the other hand, it was possible to dissolve the modified sample of the third pseudo generation in water only after adding a small amount of the NaOH., U ovom radu prikazani su rezultati ispitivanja tri uzorka Boltorn® hidroksi-funkcionalnih hiperrazgranatih alifatskih poliestara druge, treće i četvrte pseudo generacije, kao i frakcija uzoraka treće i četvrte pseudo generacije. Primenom GPC analize pokazano je da sa povećanjem broja pseudo generacije dolazi do rasta molarne mase ali i polidisperznosti ovih uzoraka. Vrednosti graničnog viskozitetnog broja i hidrodinamičkog prečnika ispitivanih poliestara, određenih u N-metil-2-pirolidonu kao rastvaraču, rastu sa povećanjem broja pseudo generacije, dok kod frakcija ove vrednosti opadaju od prve do treće frakcije. Na osnovu termogravimetrijskih rezultata konstantovano je da termička stabilnost ovih uzoraka raste sa povećanjem broja pseudo- generacije. Modifikovanjem krajnjih hidroksilnih grupa Boltorn® hiperrazgranatog poliestra druge pseudo generacije β-alaninom dobijen je uzorak rastvoran u vodi, dok se uzorak treće pseudo generacije, takođe modifikovan β-alaninom, rastvorio u vodi nakon dodavanja male količine NaOH.",
publisher = "Association of Chemical Engineers of Serbia",
journal = "Hemijska industrija",
title = "Characterization of the commercial hyperbranched polyesters, Karakterizacija komercijalnih hiperrazgranatih poliestara",
volume = "64",
number = "6",
pages = "547-553",
doi = "10.2298/HEMIND101014060D"
}

Džunuzović, J., Jovanović, S. M.,& Lechner, M. D.. (2010). Characterization of the commercial hyperbranched polyesters. in Hemijska industrija
Association of Chemical Engineers of Serbia., 64(6), 547-553.
https://doi.org/10.2298/HEMIND101014060D

Džunuzović J, Jovanović SM, Lechner MD. Characterization of the commercial hyperbranched polyesters. in Hemijska industrija. 2010;64(6):547-553.
doi:10.2298/HEMIND101014060D .

Džunuzović, Jasna, Jovanović, Slobodan M., Lechner, Manfred D., "Characterization of the commercial hyperbranched polyesters" in Hemijska industrija, 64, no. 6 (2010):547-553,
https://doi.org/10.2298/HEMIND101014060D . .

TY  - JOUR
AU  - Vuković, Jasna
AU  - Jovanović, Slobodan
AU  - Lechner, Manfred D.
AU  - Vodnik, Vesna
PY  - 2009
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/6887
AB  - Rheological behavior in melt of aliphatic hyperbranched polyesters (AHBP), synthesized using pseudo-one-step and one-step procedure, was investigated in this work. Three commercially available AHBP were also examined. Because of the presence of relatively strong hydrogen bonds between numerous end hydroxyl groups, AHBP of lower generation number, as well as the sample of tenth pseudo generation, show non-Newtonian behavior in the entire investigated frequency and temperature region. However, for other examined AHBP, the slope of the frequency dependence of complex viscosity (g* ¼ f(x)) becomes smaller with the temperature increase. Therefore, samples of fourth, fifth, and sixth pseudo generations show Newtonian behavior at temperatures higher than 70 C. Value of glass transition temperature, melt flow activation energy, fractional free volume, and thermal expansion coefficient were determined for the investigated AHBP. The influence of the type of end groups on rheological properties of AHBP was also examined.
PB  - Wiley
T2  - Journal of Applied Polymer Science
T1  - Melt Rheology of Aliphatic Hyperbranched Polyesters
VL  - 112
SP  - 2925
EP  - 2934
DO  - 10.1002/app.29836
ER  - 

@article{
author = "Vuković, Jasna and Jovanović, Slobodan and Lechner, Manfred D. and Vodnik, Vesna",
year = "2009",
abstract = "Rheological behavior in melt of aliphatic hyperbranched polyesters (AHBP), synthesized using pseudo-one-step and one-step procedure, was investigated in this work. Three commercially available AHBP were also examined. Because of the presence of relatively strong hydrogen bonds between numerous end hydroxyl groups, AHBP of lower generation number, as well as the sample of tenth pseudo generation, show non-Newtonian behavior in the entire investigated frequency and temperature region. However, for other examined AHBP, the slope of the frequency dependence of complex viscosity (g* ¼ f(x)) becomes smaller with the temperature increase. Therefore, samples of fourth, fifth, and sixth pseudo generations show Newtonian behavior at temperatures higher than 70 C. Value of glass transition temperature, melt flow activation energy, fractional free volume, and thermal expansion coefficient were determined for the investigated AHBP. The influence of the type of end groups on rheological properties of AHBP was also examined.",
publisher = "Wiley",
journal = "Journal of Applied Polymer Science",
title = "Melt Rheology of Aliphatic Hyperbranched Polyesters",
volume = "112",
pages = "2925-2934",
doi = "10.1002/app.29836"
}

Vuković, J., Jovanović, S., Lechner, M. D.,& Vodnik, V.. (2009). Melt Rheology of Aliphatic Hyperbranched Polyesters. in Journal of Applied Polymer Science
Wiley., 112, 2925-2934.
https://doi.org/10.1002/app.29836

Vuković J, Jovanović S, Lechner MD, Vodnik V. Melt Rheology of Aliphatic Hyperbranched Polyesters. in Journal of Applied Polymer Science. 2009;112:2925-2934.
doi:10.1002/app.29836 .

Vuković, Jasna, Jovanović, Slobodan, Lechner, Manfred D., Vodnik, Vesna, "Melt Rheology of Aliphatic Hyperbranched Polyesters" in Journal of Applied Polymer Science, 112 (2009):2925-2934,
https://doi.org/10.1002/app.29836 . .

TY  - CHAP
AU  - Vuković, Jasna
AU  - Jovanović, Slobodan
AU  - Lechner, Manfred D.
AU  - Vodnik, Vesna
PY  - 2009
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/6786
AB  - The results obtained by investigation of the influence of synthesis procedure on the molecular structure of aliphatic hyperbranched polyesters (AHBP) are presented in this work. Different pseudo generations of these three-dimensional polymers were synthesized via an acid-catalyzed polyesterification of 2,2-bis(hydroxymethyl)propionic acid (bis-MPA) and di-trimethylolpropane (DiTMP) using two different procedures: pseudo one-step (samples of the series I) and one-step (samples of the series II). In pseudo one-step procedure the sample of certain pseudo generation was obtained starting from the sample of previous pseudo generation and adequate amount of monomer, while in simple one-step procedure polymer of the wanted pseudo generation was synthesized by mixing the stoichometric amount of all necessary reactants at once. Beside these samples, three commercial Boltorn® AHBP synthesized by pseudo one-step procedure were also investigated. Results obtained by NMR, MALDI-TOF MS and VPO show that formation of poly(bis-MPA) and cyclization through the ester and ether bonds (intramolecular) occurred as side reactions during the both procedures for the synthesis. With increasing degree of polymerization, the extent of these unwanted reactions increased and it was slightly higher when one-step procedure was applied for the preparation of AHBP samples. During the synthesis of AHBP from second till fifth pseudo generation, cyclization occurred through ester and ether bonds (intramolecular), while in the case of the higher generation samples, cycles were formed due to the intramolecular esterification. Furthermore, –OH groups belonging to the terminal units had better reactivity than linear ones. Consequently, the degree of branching for all investigated samples is lower than 0.50. Due to the side reactions occurrence, molar mass increases only up to the sixth pseudo generation and values of the molar masses are much lower than theoretical. From the obtained results it was also possible to calculate the percentage of deviation from the perfect dendrimer structure for AHBP samples of the series I and II.
PB  - Nova Science
T2  - Modern trends in macromolecular chemistry
T1  - Synthesis and molecular structure investigation of aliphatic hyperbranched polyesters
SP  - 39
EP  - 59
UR  - https://hdl.handle.net/21.15107/rcub_cer_6786
ER  - 

@inbook{
author = "Vuković, Jasna and Jovanović, Slobodan and Lechner, Manfred D. and Vodnik, Vesna",
year = "2009",
abstract = "The results obtained by investigation of the influence of synthesis procedure on the molecular structure of aliphatic hyperbranched polyesters (AHBP) are presented in this work. Different pseudo generations of these three-dimensional polymers were synthesized via an acid-catalyzed polyesterification of 2,2-bis(hydroxymethyl)propionic acid (bis-MPA) and di-trimethylolpropane (DiTMP) using two different procedures: pseudo one-step (samples of the series I) and one-step (samples of the series II). In pseudo one-step procedure the sample of certain pseudo generation was obtained starting from the sample of previous pseudo generation and adequate amount of monomer, while in simple one-step procedure polymer of the wanted pseudo generation was synthesized by mixing the stoichometric amount of all necessary reactants at once. Beside these samples, three commercial Boltorn® AHBP synthesized by pseudo one-step procedure were also investigated. Results obtained by NMR, MALDI-TOF MS and VPO show that formation of poly(bis-MPA) and cyclization through the ester and ether bonds (intramolecular) occurred as side reactions during the both procedures for the synthesis. With increasing degree of polymerization, the extent of these unwanted reactions increased and it was slightly higher when one-step procedure was applied for the preparation of AHBP samples. During the synthesis of AHBP from second till fifth pseudo generation, cyclization occurred through ester and ether bonds (intramolecular), while in the case of the higher generation samples, cycles were formed due to the intramolecular esterification. Furthermore, –OH groups belonging to the terminal units had better reactivity than linear ones. Consequently, the degree of branching for all investigated samples is lower than 0.50. Due to the side reactions occurrence, molar mass increases only up to the sixth pseudo generation and values of the molar masses are much lower than theoretical. From the obtained results it was also possible to calculate the percentage of deviation from the perfect dendrimer structure for AHBP samples of the series I and II.",
publisher = "Nova Science",
journal = "Modern trends in macromolecular chemistry",
booktitle = "Synthesis and molecular structure investigation of aliphatic hyperbranched polyesters",
pages = "39-59",
url = "https://hdl.handle.net/21.15107/rcub_cer_6786"
}

Vuković, J., Jovanović, S., Lechner, M. D.,& Vodnik, V.. (2009). Synthesis and molecular structure investigation of aliphatic hyperbranched polyesters. in Modern trends in macromolecular chemistry
Nova Science., 39-59.
https://hdl.handle.net/21.15107/rcub_cer_6786

Vuković J, Jovanović S, Lechner MD, Vodnik V. Synthesis and molecular structure investigation of aliphatic hyperbranched polyesters. in Modern trends in macromolecular chemistry. 2009;:39-59.
https://hdl.handle.net/21.15107/rcub_cer_6786 .

Vuković, Jasna, Jovanović, Slobodan, Lechner, Manfred D., Vodnik, Vesna, "Synthesis and molecular structure investigation of aliphatic hyperbranched polyesters" in Modern trends in macromolecular chemistry (2009):39-59,
https://hdl.handle.net/21.15107/rcub_cer_6786 .

TY  - JOUR
AU  - Vuković, Jasna
AU  - Lechner, Manfred D.
AU  - Jovanović, Slobodan
PY  - 2007
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/6795
AB  - The rheological investigation of concentrated solutions of aliphatic hyperbranched polyesters
(AHBP) in N-methyl-2-pyrrolidinon (NMP) is presented. Two series of hydroxy-functional
AHBP were synthesized using pseudo-one-step and one-step procedure. Three commercial
(Boltorn1) AHBP were also investigated. In the
examined temperature region (10–50 8C), AHBP
solutions (c 45 wt.-%) exhibited Newtonian behavior.
The same was observed for 50 and 55 wt.-%
solutions at T 40 8C. However, at T<50 8C, solutions
of AHBP of higher concentrations (50 and
55 wt.-%) showed shear thinning behavior. Values
of the flow activation energies were calculated for
all examined AHBP. The influence of the procedure
for the synthesis, concentration and temperature on
rheological behavior of AHBP solutions in NMP is
discussed.
PB  - Willey
T2  - Macromolecular Chemistry and Physics
T1  - Rheological properties of concentrated solutions of aliphatic hyperbranched polyesters
VL  - 208
IS  - 21
SP  - 2321
EP  - 2330
DO  - 10.1002/macp.200700262
ER  - 

@article{
author = "Vuković, Jasna and Lechner, Manfred D. and Jovanović, Slobodan",
year = "2007",
abstract = "The rheological investigation of concentrated solutions of aliphatic hyperbranched polyesters
(AHBP) in N-methyl-2-pyrrolidinon (NMP) is presented. Two series of hydroxy-functional
AHBP were synthesized using pseudo-one-step and one-step procedure. Three commercial
(Boltorn1) AHBP were also investigated. In the
examined temperature region (10–50 8C), AHBP
solutions (c 45 wt.-%) exhibited Newtonian behavior.
The same was observed for 50 and 55 wt.-%
solutions at T 40 8C. However, at T<50 8C, solutions
of AHBP of higher concentrations (50 and
55 wt.-%) showed shear thinning behavior. Values
of the flow activation energies were calculated for
all examined AHBP. The influence of the procedure
for the synthesis, concentration and temperature on
rheological behavior of AHBP solutions in NMP is
discussed.",
publisher = "Willey",
journal = "Macromolecular Chemistry and Physics",
title = "Rheological properties of concentrated solutions of aliphatic hyperbranched polyesters",
volume = "208",
number = "21",
pages = "2321-2330",
doi = "10.1002/macp.200700262"
}

Vuković, J., Lechner, M. D.,& Jovanović, S.. (2007). Rheological properties of concentrated solutions of aliphatic hyperbranched polyesters. in Macromolecular Chemistry and Physics
Willey., 208(21), 2321-2330.
https://doi.org/10.1002/macp.200700262

Vuković J, Lechner MD, Jovanović S. Rheological properties of concentrated solutions of aliphatic hyperbranched polyesters. in Macromolecular Chemistry and Physics. 2007;208(21):2321-2330.
doi:10.1002/macp.200700262 .

Vuković, Jasna, Lechner, Manfred D., Jovanović, Slobodan, "Rheological properties of concentrated solutions of aliphatic hyperbranched polyesters" in Macromolecular Chemistry and Physics, 208, no. 21 (2007):2321-2330,
https://doi.org/10.1002/macp.200700262 . .

TY  - JOUR
AU  - Vuković, Jasna
AU  - Steinmeier, D.
AU  - Lechner, Manfred D.
AU  - Jovanović, Slobodan
AU  - Božić, Branislav
PY  - 2006
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/6796
AB  - In this study results of thermal degradation of aliphatic hyperbranched polyesters, AHBP, and their derivatives, determined by non-isothermal thermogravimetric analysis in inert atmosphere (N2) are presented. The thermal stability of linear polyester PHPA (polyhydroxypivalic acid), additionally synthesized from hydroxypivalic acid, was also studied. AHBP samples, from second to tenth pseudo-generation, were synthesized starting from 2,2-bis(hydroxymethyl)propionic acid and di-trimethylolpropane. Modification of some selected AHBP samples was accomplished with the propionyl and benzoyl chloride, as well as with stearic acid. Thermal degradation of AHBP samples starts in the region between 250 °C and 275 °C and it ends around 430 °C. The thermal stability of AHBP samples increases with the number of end groups in the macromolecule, as well as with the modification of end groups with stearic acid and propionyl chloride. An AHBP sample of the fourth pseudo-generation, where all –OH end groups are modified with benzoyl chloride, shows lower thermal stability than the corresponding unmodified sample. The thermal stability of the linear polyester PHPA is lower than the thermal stability of the AHBP samples of the similar molar mass. The activation energies of thermal degradation for all synthesized AHBP samples were also calculated.
PB  - Elsevier
T2  - Polymer Degradation and Stability
T1  - Thermal degradation of aliphatic hyperbranched polyesters and their derivatives
VL  - 91
IS  - 8
SP  - 1903
EP  - 1908
DO  - 10.1016/j.polymdegradstab.2005.11.001
ER  - 

@article{
author = "Vuković, Jasna and Steinmeier, D. and Lechner, Manfred D. and Jovanović, Slobodan and Božić, Branislav",
year = "2006",
abstract = "In this study results of thermal degradation of aliphatic hyperbranched polyesters, AHBP, and their derivatives, determined by non-isothermal thermogravimetric analysis in inert atmosphere (N2) are presented. The thermal stability of linear polyester PHPA (polyhydroxypivalic acid), additionally synthesized from hydroxypivalic acid, was also studied. AHBP samples, from second to tenth pseudo-generation, were synthesized starting from 2,2-bis(hydroxymethyl)propionic acid and di-trimethylolpropane. Modification of some selected AHBP samples was accomplished with the propionyl and benzoyl chloride, as well as with stearic acid. Thermal degradation of AHBP samples starts in the region between 250 °C and 275 °C and it ends around 430 °C. The thermal stability of AHBP samples increases with the number of end groups in the macromolecule, as well as with the modification of end groups with stearic acid and propionyl chloride. An AHBP sample of the fourth pseudo-generation, where all –OH end groups are modified with benzoyl chloride, shows lower thermal stability than the corresponding unmodified sample. The thermal stability of the linear polyester PHPA is lower than the thermal stability of the AHBP samples of the similar molar mass. The activation energies of thermal degradation for all synthesized AHBP samples were also calculated.",
publisher = "Elsevier",
journal = "Polymer Degradation and Stability",
title = "Thermal degradation of aliphatic hyperbranched polyesters and their derivatives",
volume = "91",
number = "8",
pages = "1903-1908",
doi = "10.1016/j.polymdegradstab.2005.11.001"
}

Vuković, J., Steinmeier, D., Lechner, M. D., Jovanović, S.,& Božić, B.. (2006). Thermal degradation of aliphatic hyperbranched polyesters and their derivatives. in Polymer Degradation and Stability
Elsevier., 91(8), 1903-1908.
https://doi.org/10.1016/j.polymdegradstab.2005.11.001

Vuković J, Steinmeier D, Lechner MD, Jovanović S, Božić B. Thermal degradation of aliphatic hyperbranched polyesters and their derivatives. in Polymer Degradation and Stability. 2006;91(8):1903-1908.
doi:10.1016/j.polymdegradstab.2005.11.001 .

Vuković, Jasna, Steinmeier, D., Lechner, Manfred D., Jovanović, Slobodan, Božić, Branislav, "Thermal degradation of aliphatic hyperbranched polyesters and their derivatives" in Polymer Degradation and Stability, 91, no. 8 (2006):1903-1908,
https://doi.org/10.1016/j.polymdegradstab.2005.11.001 . .

TY  - JOUR
AU  - Vuković, Jasna
AU  - Bozić, Branislav
AU  - Lechner, Manfred
AU  - Jovanović, Slobodan
PY  - 2002
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/6889
AB  - U okviru ovog rada prikazani su rezultati dobijeni izučavanjem uticaja molarne mase (generacije), broja krajnjih grupa, kao i vrste krajnjih grupa na termičku stabilnost alifatskih hiperrazgranatih poliestara (AHP). Vrsta krajnjih grupa je menjana modifikovanjem sintetizovanih hiperrazgranatih poliestara sa hloridom propionske kiseline i stearinskom kiselinom. Termička stabilnost ispitivanih uzoraka je određivana merenjem promene mase uzorka sa temperaturom pomoću instrumenta NETZSCH TG 209 u atmosferi azota pri brzini zagrevanja od 10 oC. Poređenjem temperatura pri gubitku mase od 5, 20 i 40 mas.% za ispitivane nemodifikovane uzorke AHP, očitanih sa termogravimetrijskih krivih, konstantovano je da njihova termička stabilnost blago raste do četvrte generacije, a zatim ostaje praktično konstantna. Modifikovanjem krajnjih hidroksilnih grupa uzoraka AHP druge, treće i četvrte generacije sa propionskom i stearinskom kiselinom termička stabilnost uzoraka se blago povećava.
AB  - The influence of the molar mass (generation), number and type of end groups on the thermal stability of aliphatic hyperbranched polyesters are presented in this study. Different end groups were obtained by modification of the samples with chlorides of propionic acid and stearic acid. The thermal stability of the hyperbranched polyesters was determined by thermogravimetry using a NET-ZSCH TG 209 instrument in nitrogen atmosphere at a heating rate of 10°C/min. A comparison of the temperatures obtained for mass losses of 5 20 and 40 wt% for unmodified samples showed that the thermal stability increased up to the fourth generation and then remained practically constant. An increase in the thermal stability of modified samples of the second, third and fourth generation was observed.
PB  - Association of Chemical Engineers of Serbia
T2  - Hemijska Industrija
T1  - Termička stabilnost alifatskih hiperrazgranatih poliestara
T1  - Thermal stability of aliphatic hyperbranched polyesters
VL  - 56
IS  - 11
SP  - 473
EP  - 477
DO  - 10.2298/HEMIND0211473V
ER  - 

@article{
author = "Vuković, Jasna and Bozić, Branislav and Lechner, Manfred and Jovanović, Slobodan",
year = "2002",
abstract = "U okviru ovog rada prikazani su rezultati dobijeni izučavanjem uticaja molarne mase (generacije), broja krajnjih grupa, kao i vrste krajnjih grupa na termičku stabilnost alifatskih hiperrazgranatih poliestara (AHP). Vrsta krajnjih grupa je menjana modifikovanjem sintetizovanih hiperrazgranatih poliestara sa hloridom propionske kiseline i stearinskom kiselinom. Termička stabilnost ispitivanih uzoraka je određivana merenjem promene mase uzorka sa temperaturom pomoću instrumenta NETZSCH TG 209 u atmosferi azota pri brzini zagrevanja od 10 oC. Poređenjem temperatura pri gubitku mase od 5, 20 i 40 mas.% za ispitivane nemodifikovane uzorke AHP, očitanih sa termogravimetrijskih krivih, konstantovano je da njihova termička stabilnost blago raste do četvrte generacije, a zatim ostaje praktično konstantna. Modifikovanjem krajnjih hidroksilnih grupa uzoraka AHP druge, treće i četvrte generacije sa propionskom i stearinskom kiselinom termička stabilnost uzoraka se blago povećava., The influence of the molar mass (generation), number and type of end groups on the thermal stability of aliphatic hyperbranched polyesters are presented in this study. Different end groups were obtained by modification of the samples with chlorides of propionic acid and stearic acid. The thermal stability of the hyperbranched polyesters was determined by thermogravimetry using a NET-ZSCH TG 209 instrument in nitrogen atmosphere at a heating rate of 10°C/min. A comparison of the temperatures obtained for mass losses of 5 20 and 40 wt% for unmodified samples showed that the thermal stability increased up to the fourth generation and then remained practically constant. An increase in the thermal stability of modified samples of the second, third and fourth generation was observed.",
publisher = "Association of Chemical Engineers of Serbia",
journal = "Hemijska Industrija",
title = "Termička stabilnost alifatskih hiperrazgranatih poliestara, Thermal stability of aliphatic hyperbranched polyesters",
volume = "56",
number = "11",
pages = "473-477",
doi = "10.2298/HEMIND0211473V"
}

Vuković, J., Bozić, B., Lechner, M.,& Jovanović, S.. (2002). Termička stabilnost alifatskih hiperrazgranatih poliestara. in Hemijska Industrija
Association of Chemical Engineers of Serbia., 56(11), 473-477.
https://doi.org/10.2298/HEMIND0211473V

Vuković J, Bozić B, Lechner M, Jovanović S. Termička stabilnost alifatskih hiperrazgranatih poliestara. in Hemijska Industrija. 2002;56(11):473-477.
doi:10.2298/HEMIND0211473V .

Vuković, Jasna, Bozić, Branislav, Lechner, Manfred, Jovanović, Slobodan, "Termička stabilnost alifatskih hiperrazgranatih poliestara" in Hemijska Industrija, 56, no. 11 (2002):473-477,
https://doi.org/10.2298/HEMIND0211473V . .