Properties of aliphatic hyperbranched polyesters in diluted solutions
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The results of an investigation of the influence of the synthesis procedure,
number of pseudo generations and degree of branching of hydroxy-functional aliphatic hyperbranched polyesters (AHBP) on the values of limiting viscosity number, [η], hydrodynamic radius, Rη, molar mass and polydispersity index, Q, are presented in this paper. Two series of AHBP, synthesized from 2,2-bis(hydroxymethyl)propionic acid and di-trimethylolpropane using a pseudo-one-step and a one-step
procedure were investigated. The obtained results show that the values of [η] and Rη
for all examined samples are the highest in a 0.7 mass % solution of LiCl in N,N-dimethylacetamide (LiCl/DMAc), which indicates that this solvent is the best from
the investigated ones. The values of [η] in N-methyl-2-pyrrolidinone (NMP) increased up to the sixth pseudo generation, after which a slight decrease occurred as the
consequence of the presence of side-reaction products, formed during the synthesis.
The appearance of th...ese side-reaction products was also confirmed from the characteristic GPC chromatograms. For the samples of AHBP synthesized using the pseudo-one-step procedure, a good linear dependence between log [η] and log Mw was
obtained up to the fifth pseudo generation, when LiCl/DMAc, NMP and DMAc
were used as solvents. The values of the “shrinking” factor, g’, were calculated for
all investigated AHBPs.
Keywords:
Aliphatic hyperbranched polyesters / Dilute solutions / Limiting viscosity number / GPCSource:
Journal of the Serbian Chemical Society, 2007, 72, 12, 1493-1506Publisher:
- Belgrade : Serbian Chemical Society
DOI: 10.2298/JSC0712493V
ISSN: 0352-5139
WoS: 000252412100031
Scopus: 2-s2.0-36949039425
Institution/Community
IHTMTY - JOUR AU - Vuković, Jasna AU - Lechner, M. D. AU - Jovanović, S. PY - 2007 UR - https://cer.ihtm.bg.ac.rs/handle/123456789/6888 AB - The results of an investigation of the influence of the synthesis procedure, number of pseudo generations and degree of branching of hydroxy-functional aliphatic hyperbranched polyesters (AHBP) on the values of limiting viscosity number, [η], hydrodynamic radius, Rη, molar mass and polydispersity index, Q, are presented in this paper. Two series of AHBP, synthesized from 2,2-bis(hydroxymethyl)propionic acid and di-trimethylolpropane using a pseudo-one-step and a one-step procedure were investigated. The obtained results show that the values of [η] and Rη for all examined samples are the highest in a 0.7 mass % solution of LiCl in N,N-dimethylacetamide (LiCl/DMAc), which indicates that this solvent is the best from the investigated ones. The values of [η] in N-methyl-2-pyrrolidinone (NMP) increased up to the sixth pseudo generation, after which a slight decrease occurred as the consequence of the presence of side-reaction products, formed during the synthesis. The appearance of these side-reaction products was also confirmed from the characteristic GPC chromatograms. For the samples of AHBP synthesized using the pseudo-one-step procedure, a good linear dependence between log [η] and log Mw was obtained up to the fifth pseudo generation, when LiCl/DMAc, NMP and DMAc were used as solvents. The values of the “shrinking” factor, g’, were calculated for all investigated AHBPs. PB - Belgrade : Serbian Chemical Society T2 - Journal of the Serbian Chemical Society T1 - Properties of aliphatic hyperbranched polyesters in diluted solutions VL - 72 IS - 12 SP - 1493 EP - 1506 DO - 10.2298/JSC0712493V ER -
@article{ author = "Vuković, Jasna and Lechner, M. D. and Jovanović, S.", year = "2007", abstract = "The results of an investigation of the influence of the synthesis procedure, number of pseudo generations and degree of branching of hydroxy-functional aliphatic hyperbranched polyesters (AHBP) on the values of limiting viscosity number, [η], hydrodynamic radius, Rη, molar mass and polydispersity index, Q, are presented in this paper. Two series of AHBP, synthesized from 2,2-bis(hydroxymethyl)propionic acid and di-trimethylolpropane using a pseudo-one-step and a one-step procedure were investigated. The obtained results show that the values of [η] and Rη for all examined samples are the highest in a 0.7 mass % solution of LiCl in N,N-dimethylacetamide (LiCl/DMAc), which indicates that this solvent is the best from the investigated ones. The values of [η] in N-methyl-2-pyrrolidinone (NMP) increased up to the sixth pseudo generation, after which a slight decrease occurred as the consequence of the presence of side-reaction products, formed during the synthesis. The appearance of these side-reaction products was also confirmed from the characteristic GPC chromatograms. For the samples of AHBP synthesized using the pseudo-one-step procedure, a good linear dependence between log [η] and log Mw was obtained up to the fifth pseudo generation, when LiCl/DMAc, NMP and DMAc were used as solvents. The values of the “shrinking” factor, g’, were calculated for all investigated AHBPs.", publisher = "Belgrade : Serbian Chemical Society", journal = "Journal of the Serbian Chemical Society", title = "Properties of aliphatic hyperbranched polyesters in diluted solutions", volume = "72", number = "12", pages = "1493-1506", doi = "10.2298/JSC0712493V" }
Vuković, J., Lechner, M. D.,& Jovanović, S.. (2007). Properties of aliphatic hyperbranched polyesters in diluted solutions. in Journal of the Serbian Chemical Society Belgrade : Serbian Chemical Society., 72(12), 1493-1506. https://doi.org/10.2298/JSC0712493V
Vuković J, Lechner MD, Jovanović S. Properties of aliphatic hyperbranched polyesters in diluted solutions. in Journal of the Serbian Chemical Society. 2007;72(12):1493-1506. doi:10.2298/JSC0712493V .
Vuković, Jasna, Lechner, M. D., Jovanović, S., "Properties of aliphatic hyperbranched polyesters in diluted solutions" in Journal of the Serbian Chemical Society, 72, no. 12 (2007):1493-1506, https://doi.org/10.2298/JSC0712493V . .