Characterization of polyurethane crosslinked structures based on hyperbranched polyester
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The novel polyurethane crosslinked structures based on α,ω-dihydroxy-(ethylene
oxide-poly(dimethylsiloxane)-ethylene oxide) (EO-PDMS-EO), 4,4’-
methylenediphenyl diisocyanate and Boltorn® hyperbranched polyester of the
second pseudo generation were characterized by infrared spectroscopy, scanning
electron microscopy and thermogravimetric analysis. The chemical structure and
hydrogen-bond interactions of these polymers were investigated by infrared
spectroscopy. The carbonyl region was fitted by the Gaussian deconvolution
technique, using the PeakFit program, resulting in the determination of locations
and areas of each band. The polyurethanes exhibited five absorbance peaks in
carbonyl region: hydrogen-bonded carbonyl groups in ordered hard domains at
1690 cm-1, free (non-bonded) carbonyl groups at 1735 cm-1, hydrogen-bonded
carbonyl groups in disordered domains at 1715 cm-1, free carbonyl groups from
ester bonds at 1725 cm-1 and hydrogen-bonded carbonyl groups from ester b...onds
at 1650 cm-1. The deconvolution procedure showed very good agreement between
observed and generated values. The fit standard error was in the range from
0.00013 to 0.0028 and r2 > 0.994. The hydrogen bonds formation between urethane
groups and between urethane –NH and ester carbonyl groups in polyurethanes
increases with the decrease of EO-PDMS-EO content. The EDX analyses,
performed to indentify the nature of the atoms present in the samples at a depth of
100-1000 nm from the surfaces, revealed the presence of all expected elements (C,
O, Si and N). The Si percentage detected by EDX on the surface of polyurethanes
increases with increasing PDMS content. The surface morphology of the
polyurethanes indicated that the separation of the micro-domains was improved by
increasing EO-PDMS-EO content. Thermal stability of polyurethanes increased with
increase of EO-PDMS-EO content up to the temperature corresponding to the
approximately 50 % of weight loss. However, at higher temperatures thermal
degradation became slower for samples with lower EO-PDMS-EO content.
Keywords:
Polyurethane / Boltorn® hyperbranched polyesterSource:
16th European Conference on Analytical Chemistry, Euroanalysis 2011, „Challenges in Modern Analytical Chemistry“, Abstracts, September 11-15, Belgrade, Serbia, 2011, 314-314Publisher:
- European association for chemical and molecular sciences (EuCheMS)
Funding / projects:
- Synthesis and characterization of novel functional polymers and polymeric nanocomposites (RS-MESTD-Basic Research (BR or ON)-172062)
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Institution/Community
IHTMTY - CONF AU - Pergal, Marija AU - Džunuzović, Jasna AU - Pergal, M. M. AU - Ostojić, S. AU - Jovanović, S. PY - 2011 UR - https://cer.ihtm.bg.ac.rs/handle/123456789/6755 AB - The novel polyurethane crosslinked structures based on α,ω-dihydroxy-(ethylene oxide-poly(dimethylsiloxane)-ethylene oxide) (EO-PDMS-EO), 4,4’- methylenediphenyl diisocyanate and Boltorn® hyperbranched polyester of the second pseudo generation were characterized by infrared spectroscopy, scanning electron microscopy and thermogravimetric analysis. The chemical structure and hydrogen-bond interactions of these polymers were investigated by infrared spectroscopy. The carbonyl region was fitted by the Gaussian deconvolution technique, using the PeakFit program, resulting in the determination of locations and areas of each band. The polyurethanes exhibited five absorbance peaks in carbonyl region: hydrogen-bonded carbonyl groups in ordered hard domains at 1690 cm-1, free (non-bonded) carbonyl groups at 1735 cm-1, hydrogen-bonded carbonyl groups in disordered domains at 1715 cm-1, free carbonyl groups from ester bonds at 1725 cm-1 and hydrogen-bonded carbonyl groups from ester bonds at 1650 cm-1. The deconvolution procedure showed very good agreement between observed and generated values. The fit standard error was in the range from 0.00013 to 0.0028 and r2 > 0.994. The hydrogen bonds formation between urethane groups and between urethane –NH and ester carbonyl groups in polyurethanes increases with the decrease of EO-PDMS-EO content. The EDX analyses, performed to indentify the nature of the atoms present in the samples at a depth of 100-1000 nm from the surfaces, revealed the presence of all expected elements (C, O, Si and N). The Si percentage detected by EDX on the surface of polyurethanes increases with increasing PDMS content. The surface morphology of the polyurethanes indicated that the separation of the micro-domains was improved by increasing EO-PDMS-EO content. Thermal stability of polyurethanes increased with increase of EO-PDMS-EO content up to the temperature corresponding to the approximately 50 % of weight loss. However, at higher temperatures thermal degradation became slower for samples with lower EO-PDMS-EO content. PB - European association for chemical and molecular sciences (EuCheMS) C3 - 16th European Conference on Analytical Chemistry, Euroanalysis 2011, „Challenges in Modern Analytical Chemistry“, Abstracts, September 11-15, Belgrade, Serbia T1 - Characterization of polyurethane crosslinked structures based on hyperbranched polyester SP - 314 EP - 314 UR - https://hdl.handle.net/21.15107/rcub_cer_6755 ER -
@conference{ author = "Pergal, Marija and Džunuzović, Jasna and Pergal, M. M. and Ostojić, S. and Jovanović, S.", year = "2011", abstract = "The novel polyurethane crosslinked structures based on α,ω-dihydroxy-(ethylene oxide-poly(dimethylsiloxane)-ethylene oxide) (EO-PDMS-EO), 4,4’- methylenediphenyl diisocyanate and Boltorn® hyperbranched polyester of the second pseudo generation were characterized by infrared spectroscopy, scanning electron microscopy and thermogravimetric analysis. The chemical structure and hydrogen-bond interactions of these polymers were investigated by infrared spectroscopy. The carbonyl region was fitted by the Gaussian deconvolution technique, using the PeakFit program, resulting in the determination of locations and areas of each band. The polyurethanes exhibited five absorbance peaks in carbonyl region: hydrogen-bonded carbonyl groups in ordered hard domains at 1690 cm-1, free (non-bonded) carbonyl groups at 1735 cm-1, hydrogen-bonded carbonyl groups in disordered domains at 1715 cm-1, free carbonyl groups from ester bonds at 1725 cm-1 and hydrogen-bonded carbonyl groups from ester bonds at 1650 cm-1. The deconvolution procedure showed very good agreement between observed and generated values. The fit standard error was in the range from 0.00013 to 0.0028 and r2 > 0.994. The hydrogen bonds formation between urethane groups and between urethane –NH and ester carbonyl groups in polyurethanes increases with the decrease of EO-PDMS-EO content. The EDX analyses, performed to indentify the nature of the atoms present in the samples at a depth of 100-1000 nm from the surfaces, revealed the presence of all expected elements (C, O, Si and N). The Si percentage detected by EDX on the surface of polyurethanes increases with increasing PDMS content. The surface morphology of the polyurethanes indicated that the separation of the micro-domains was improved by increasing EO-PDMS-EO content. Thermal stability of polyurethanes increased with increase of EO-PDMS-EO content up to the temperature corresponding to the approximately 50 % of weight loss. However, at higher temperatures thermal degradation became slower for samples with lower EO-PDMS-EO content.", publisher = "European association for chemical and molecular sciences (EuCheMS)", journal = "16th European Conference on Analytical Chemistry, Euroanalysis 2011, „Challenges in Modern Analytical Chemistry“, Abstracts, September 11-15, Belgrade, Serbia", title = "Characterization of polyurethane crosslinked structures based on hyperbranched polyester", pages = "314-314", url = "https://hdl.handle.net/21.15107/rcub_cer_6755" }
Pergal, M., Džunuzović, J., Pergal, M. M., Ostojić, S.,& Jovanović, S.. (2011). Characterization of polyurethane crosslinked structures based on hyperbranched polyester. in 16th European Conference on Analytical Chemistry, Euroanalysis 2011, „Challenges in Modern Analytical Chemistry“, Abstracts, September 11-15, Belgrade, Serbia European association for chemical and molecular sciences (EuCheMS)., 314-314. https://hdl.handle.net/21.15107/rcub_cer_6755
Pergal M, Džunuzović J, Pergal MM, Ostojić S, Jovanović S. Characterization of polyurethane crosslinked structures based on hyperbranched polyester. in 16th European Conference on Analytical Chemistry, Euroanalysis 2011, „Challenges in Modern Analytical Chemistry“, Abstracts, September 11-15, Belgrade, Serbia. 2011;:314-314. https://hdl.handle.net/21.15107/rcub_cer_6755 .
Pergal, Marija, Džunuzović, Jasna, Pergal, M. M., Ostojić, S., Jovanović, S., "Characterization of polyurethane crosslinked structures based on hyperbranched polyester" in 16th European Conference on Analytical Chemistry, Euroanalysis 2011, „Challenges in Modern Analytical Chemistry“, Abstracts, September 11-15, Belgrade, Serbia (2011):314-314, https://hdl.handle.net/21.15107/rcub_cer_6755 .