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Rubber‐modified epoxies. II. A reaction‐induced phase separation observed in‐situ and a posteriori with different methods
Author(s) -
Chen Dong,
Pascault Jean Pierre,
Sautereau Henry,
Vigier Gerard
Publication year - 1993
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/pi.4990320407
Subject(s) - small angle x ray scattering , materials science , natural rubber , epoxy , acrylonitrile , phase (matter) , transmission electron microscopy , scattering , composite material , copolymer , chemical engineering , polymer chemistry , analytical chemistry (journal) , optics , polymer , chemistry , nanotechnology , chromatography , physics , organic chemistry , engineering
Abstract The reaction‐induced phase separation in epoxy systems modified with rubber was firstly observed in situ with small angle X‐ray scattering (SAXS), light transmission (LT), light scattering (LS), scanning electronic microscopy and transmission electronic microscopy techniques. The different observation windows of the SAXS, LT and LS methods allow us to follow the phase separation at two size levels. The selected system was bisphenol‐A diglycidylether cured with 4,4′‐diamino‐3,3′‐dimethyldicyciohexylmethane, in the presence of 15% wt of epoxy‐terminated butadiene acrylonitrile random copolymers of different molecular weights. The phase separation inside the particles formed was followed first. Influences of precure temperature, rubber molecular weight, the postcure, vitrification and gelation on the evolution of the structure inside the particles are discussed. The real beginning of the phase separation is also discussed.