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Reactive Epoxy‐CTBN Rubber Blends: Reflection of Changed Curing Mechanism in Cure Shrinkage and Phase Separation Behaviour
Author(s) -
Pionteck Jürgen,
Müller Yvonne,
Häußler Liane
Publication year - 2011
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.201000147
Subject(s) - shrinkage , epoxy , curing (chemistry) , diglycidyl ether , materials science , composite material , natural rubber , bisphenol a , nitrile rubber , polymer chemistry
During curing of epoxy resins shrinkage occurs, which is caused by the formation of polymeric and crosslinked structures. We analysed this shrinkage for a system consisting of diglycidyl ether of bisphenol‐A (DGEBA), diamino diphenyl sulfone (DDS) as hardener, and a reactive or a nonreactive rubber, with or without catalyst. The shrinkage and the phase separation behaviour strongly depend on the composition. The addition of reactive rubber and of the catalyst influences the curing mechanism and reduces the crosslinking density, which is reflected by lowered glass transition temperatures and reduced shrinkage. The reactive rubber is partially incorporated in the crosslinked epoxy phase and vice versa. In this way it is possible not only to modify the morphology‐related properties but also to control the degree of the unwanted shrinkage.