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Polyester‐modified poly(ethylene ether carbonate) polyols by molecular weight advancement
Author(s) -
Harris Robert F.
Publication year - 1993
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.1993.070500506
Subject(s) - transesterification , ether , polyester , ethylene carbonate , polymer chemistry , carboxylic acid , organic chemistry , polyurethane , ethylene , polyol , chemistry , carbonate , materials science , catalysis , electrode , electrolyte
Abstract Poly(ethylene ether carbonate) polyols can be modified by chemical reactions with polyester polyols, poly(carboxylic acids), poly(carboxylic acid) esters, or poly(carboxylic acid) cyclic anhydrides under conditions of elevated temperatures and reduced pressures to give estermodified poly(ethylene ether carbonate) polyols. Polyester polyols and poly(carboxylic acid) ester are incorporated into the polymer backbone by transesterification/ advancement reactions. Poly(carboxylic acids) and poly(carboxylic acid) cyclic anhydrides first undergo esterification and then transesterification / advancement reactions. Molecular weight builds in a predictable manner and can be controlled by the amount of distillate removed. The processes have been characterized by following the distillate formation and composition as a function of reactor temperature and product molecular weight build. The products have been characterized by molecular weight and carbon‐13 NMR spectroscopy. A new family of ester‐modified poly(ethylene ether carbonate) polyols has been prepared, most of which were not available with prior technology. These polyols are useful in polyurethane applications, where the degree and type of poly modification can be used to adjust polyurethane properties. © 1993 John Wiley & Sons, Inc.