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Anhydride curing of epoxy resins via chain reaction
Author(s) -
Trappe V.,
Burchard W.,
Steinmann B.
Publication year - 1991
Publication title -
makromolekulare chemie. macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 0258-0322
DOI - 10.1002/masy.19910450110
Subject(s) - diglycidyl ether , epoxy , curing (chemistry) , phthalic anhydride , polymer chemistry , ether , branching (polymer chemistry) , materials science , imidazole , bisphenol a , chemistry , organic chemistry , composite material , catalysis
In contrast to common curing reactions, the anhydride curing of epoxies follows a living anionic chain growth. The resulting consequences of this mechanism, i.e. (1) DP n = a[M o ]/[I o ], (2) first‐order kinetics and (3) Poisson chain‐length distribution were tested with the phenyl glycidyl ether/phthalic acid anhydride system, using l‐methyl imidazole. Overall agreement was found and the observed deviations could be explained with a modified Poisson process. Conformational properties of the resins were measured by static and dynamic light scattering and by viscometry. These were compared with the quantities of a corresponding branched system prepared with a mixture of phenyl glycidyl ether and bisphenol‐A diglycidyl ether. Typical deviations to smaller dimensions were observed at high molar masses as a result of increasing branching.