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Exploration of the difference of reaction rates for polyester and polyether urethane prepolymers with 3,3′‐dichloro‐4,4′‐diaminodiphenylmethane
Author(s) -
Xiaolie Luo,
Jin Liu,
Dezhu Ma
Publication year - 1995
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1995.070570408
Subject(s) - prepolymer , polyurethane , materials science , diamine , polymer chemistry , chain (unit) , polyester , telechelic polymer , reaction mechanism , hydrogen bond , reaction rate , chemical engineering , chemistry , composite material , molecule , organic chemistry , polymer , end group , catalysis , polymerization , physics , astronomy , engineering
Polyester (PEPA) and polyether (PTMO) prepolymers with NCO end groups were synthesized. The chain extension reaction of these prepolymers with MOCA diamine was studied by FTIR spectrometry and found to be a second‐order reaction. Data on chain extension reaction rate constants and activation energy showed that the chain extension reaction rate of the PEPA prepolyme with MOCA was faster than that of PTMO prepolymer with MOCA. Such a difference of chain extension reaction rate for PEPA and PTMO prepolymers with MOCA can be explained by hydrogen bonding interaction and miscibility between hard and soft segments in the cast polyurethane elastomer. The hydrogen bonding interactions of MOCA with PEPA prepolymer and PTMO prepolymer without chain extension reaction convincingly demonstrated the difference of chain extension reaction in the polyurethane‐urea systems. © 1995 John Wiley & Sons, Inc.