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Reversible crosslinking in epoxy resins. II. New approaches
Author(s) -
Sastri V. R.,
Tesoro G. C.
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.1990.070390703
Subject(s) - epoxy , reagent , materials science , polymer chemistry , synthetic resin , chemistry , organic chemistry , composite material
Epoxy resins of varying epoxy equivalent weight were crosslinked with 4,4*‐dithiodianiline (DTDA) at a 2/1 mole ratio. Resin of equivalent weight 190 (Epon 828) was cured with DTDA at mole ratios varying from 2/1 to 1.25/1. Properties of cured resins were evaluated and their reduction was investigated. Under the conditions used, reduction to the point of complete solubilization was possible providing crosslink density did not exceed a threshold value tentatively established as M c = 400 −; 500. Recurring of reduced resins was accomplished by oxidation and by reaction of thiol groups with polyfunctional reagents, including bismaleimides and polyepoxides.