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A structure–property rationalization of some poly(carboxyl–epoxy) thermosets
Author(s) -
Fellers J.,
Golovoy A.
Publication year - 1971
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.1971.070150317
Subject(s) - thermosetting polymer , prepolymer , epoxy , glass transition , materials science , ultimate tensile strength , epoxide , polymer chemistry , polymer science , composite material , chemistry , polymer , organic chemistry , catalysis , polyurethane
The glass transition temperatures, T g , and strength properties have been determined for an acrylic‐based prepolymer containing 25 mole‐% carboxyl functionality crosslinked with five different diepoxides. The T g values vary from 100° to 200°C, and ultimate elongations of 2% to 7% at 25°C are observed with the different crosslinking agents. These variations are rationalized in terms of the structural elements present in the diepoxides. Thermosets possessing rigid structural units at the crosslink points connected by flexible segments have the best all‐around combination of T g and tensile properties. A decline in these properties was noted when the epoxide/carboxyl ratio exceeded unity owing to the formation of mixed networks and free chain ends.