摘要
Novolac/乙烯醋酸乙烯酯共聚物共混体系中的反应诱导Spinodal相分离陈文杰吴坚江明(复旦大学高分子科学系和国家教委聚合物分子工程实验室上海200433)关键词Spinodal相分离,共混物,光散射,酚醛树脂,固化反应在高分子多相体系中,...
Phase separation during curing reaction in a ternary mixture of Novolac, Poly(ethylene co vinyl acetate) (EVA) and Hexamethylenetetramine (Hexa,curing agent) was investigated by time resolved light scattering.Novolac/EVA system exhibited a Low critical Solution Temperature (LCST) type phase behavior due to H bonding interaction between components.In the early stage of curing,the mixture was in single phase.As the curing reaction proceeded,phase separation took place via spinodal decomposition (SD) induced by the increase in the molecular weight of Novolac.The time variation of q m , the characteristic wavenumber of phase separated structure at which the maximum intensity is located,is quite different from iso quench thermally induced SD. q m is increased slightly with time attributed to the rapid curing reaction and eventually levelled off with gelling.Cocontinuous phase separated structure was ultimately formed during curing reaction.
出处
《高分子学报》
SCIE
CAS
CSCD
北大核心
1998年第1期113-117,共5页
Acta Polymerica Sinica
基金
国家自然科学基金
国家教委优秀年青教师基金