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Chemical toughening of epoxies. I. Structural modification of epoxy resins by reaction with hydroxy‐terminated poly(butadiene‐co‐acrylonitrile)
Author(s) -
Sankaran S.,
Chanda Manas
Publication year - 1990
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.1990.070390704
Subject(s) - epoxy , acrylonitrile , materials science , chemical modification , natural rubber , composite material , telechelic polymer , polymer chemistry , copolymer , chemical structure , polymer , organic chemistry , chemistry , end group
In an attempt to toughen the epoxy resin matrix for fiber‐reinforced composite applications, a chemical modification procedure of a commercially available bisphenol‐A‐based epoxy resin using reactive liquid rubber HTBN [hydroxy‐terminated poly(butadiene‐co‐acrylonitrile)] and TDI (tolylene diisocyanate) is described. The progress of the reaction and the structural changes during modification process are studied using IR spectroscopy, viscosity data, and chemical analysis (epoxy value determination). The studies support the proposition that TDI acts as a coupling agent between the epoxy and HTBN, forming a urethane linkage with the former and an oxazolidone ring with the latter. The chemical reactions that possibly take place during the modification are discussed.