A series of six polyurethane (PU) networks was synthesized from Boltorn (R) hydroxy-functional hyperbranched polyester (HBP) of the second pseudo generation as a cross-linking agent, alpha,omega-dihydroxy-(ethylene oxide-poly(dimethylsiloxane)-ethylene oxide) (EO-PDMS-EO) and 4,4-methylenediphenyl diisocyanate, by two-step polymerization in solution. Each sample of the prepared PUs had different EO-PDMS-EO content. The chemical structure of the synthesized networks was analyzed by FTIR spectroscopy. The influence of the EO-PDMS-EO content and type of the solvent on the swelling behavior of the PUs in 2-propanol and toluene was investigated. During the swelling measurements, a certain amount of sal fractions was extracted from the PUs by solvents. According to the H-1-NMR results, sal fractions were mainly composed of the soluble hyperbranched PU, formed during the polymerization by partial modification of the end hydroxyl groups of HBP with NCO-terminated prepolymer synthesized in the ...first step of the reaction. Chains of the so reacted prepolymer can then fold back and form cyclic products by reaction of the free -NCO group from the NCO-terminated prepolymer with free -OH group of HBP. As the EO-PDMS-EO content increases the amount of the sol fractions and swelling degree also increased, indicating that networks with lower EO-PDMS-EO content are more cross-linked and have higher solvent resistance.
TY - JOUR
AU - Džunuzović, Jasna V.
AU - Pergal, Marija V.
AU - Jovanovic, Slobodan
AU - Vodnik, Vesna
PY - 2011
UR - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5659
AB - A series of six polyurethane (PU) networks was synthesized from Boltorn (R) hydroxy-functional hyperbranched polyester (HBP) of the second pseudo generation as a cross-linking agent, alpha,omega-dihydroxy-(ethylene oxide-poly(dimethylsiloxane)-ethylene oxide) (EO-PDMS-EO) and 4,4-methylenediphenyl diisocyanate, by two-step polymerization in solution. Each sample of the prepared PUs had different EO-PDMS-EO content. The chemical structure of the synthesized networks was analyzed by FTIR spectroscopy. The influence of the EO-PDMS-EO content and type of the solvent on the swelling behavior of the PUs in 2-propanol and toluene was investigated. During the swelling measurements, a certain amount of sal fractions was extracted from the PUs by solvents. According to the H-1-NMR results, sal fractions were mainly composed of the soluble hyperbranched PU, formed during the polymerization by partial modification of the end hydroxyl groups of HBP with NCO-terminated prepolymer synthesized in the first step of the reaction. Chains of the so reacted prepolymer can then fold back and form cyclic products by reaction of the free -NCO group from the NCO-terminated prepolymer with free -OH group of HBP. As the EO-PDMS-EO content increases the amount of the sol fractions and swelling degree also increased, indicating that networks with lower EO-PDMS-EO content are more cross-linked and have higher solvent resistance.
T2 - Hemijska industrija
T1 - Synthesis and swelling behavior of polyurethane networks based on hyperbranched polymer
EP - 644
IS - 6
SP - 637
VL - 65
DO - 10.2298/HEMIND110902071D
ER -
@article{
author = "Džunuzović, Jasna V. and Pergal, Marija V. and Jovanovic, Slobodan and Vodnik, Vesna",
year = "2011",
abstract = "A series of six polyurethane (PU) networks was synthesized from Boltorn (R) hydroxy-functional hyperbranched polyester (HBP) of the second pseudo generation as a cross-linking agent, alpha,omega-dihydroxy-(ethylene oxide-poly(dimethylsiloxane)-ethylene oxide) (EO-PDMS-EO) and 4,4-methylenediphenyl diisocyanate, by two-step polymerization in solution. Each sample of the prepared PUs had different EO-PDMS-EO content. The chemical structure of the synthesized networks was analyzed by FTIR spectroscopy. The influence of the EO-PDMS-EO content and type of the solvent on the swelling behavior of the PUs in 2-propanol and toluene was investigated. During the swelling measurements, a certain amount of sal fractions was extracted from the PUs by solvents. According to the H-1-NMR results, sal fractions were mainly composed of the soluble hyperbranched PU, formed during the polymerization by partial modification of the end hydroxyl groups of HBP with NCO-terminated prepolymer synthesized in the first step of the reaction. Chains of the so reacted prepolymer can then fold back and form cyclic products by reaction of the free -NCO group from the NCO-terminated prepolymer with free -OH group of HBP. As the EO-PDMS-EO content increases the amount of the sol fractions and swelling degree also increased, indicating that networks with lower EO-PDMS-EO content are more cross-linked and have higher solvent resistance.",
journal = "Hemijska industrija",
title = "Synthesis and swelling behavior of polyurethane networks based on hyperbranched polymer",
pages = "644-637",
number = "6",
volume = "65",
doi = "10.2298/HEMIND110902071D"
}
Džunuzović, J. V., Pergal, M. V., Jovanovic, S.,& Vodnik, V.. (2011). Synthesis and swelling behavior of polyurethane networks based on hyperbranched polymer. in Hemijska industrija, 65(6), 637-644.
https://doi.org/10.2298/HEMIND110902071D
Džunuzović JV, Pergal MV, Jovanovic S, Vodnik V. Synthesis and swelling behavior of polyurethane networks based on hyperbranched polymer. in Hemijska industrija. 2011;65(6):637-644.
doi:10.2298/HEMIND110902071D .
Džunuzović, Jasna V., Pergal, Marija V., Jovanovic, Slobodan, Vodnik, Vesna, "Synthesis and swelling behavior of polyurethane networks based on hyperbranched polymer" in Hemijska industrija, 65, no. 6 (2011):637-644,
https://doi.org/10.2298/HEMIND110902071D . .
