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Phase separation behavior of the epoxy‐CTBN mixture during the curing process
Author(s) -
Kim Do Hyun,
Kim Sung Chul
Publication year - 1991
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760310502
Subject(s) - materials science , epoxy , composite material , curing (chemistry) , natural rubber , nitrile rubber , scanning electron microscope , acrylonitrile , light scattering , scattering , copolymer , optics , polymer , physics
To improve the impact resistance of cured epoxy resin, a carboxyl‐terminated butadiene‐acrylonitrile rubber (CTBN) was added. The phase separation behavior during the curing reaction was analyzed by a light scattering experiment. The measurement of transmitted light intensity showed the onset and ending of the phase separation. The change of the scattered light intensity at different angles showed the process of the phase separation, such as the formation and growth of the dispersed domain. The morphology of the blend was also observed by scanning electron micrography (SEM) and was compared with the domains measured by the light scattering method. The impact strength and dynamic mechanical properties of epoxy resin of different rubber concentrations and cured at different temperature were compared, and the effect of the domain size on these properties was analyzed.