固化反应产物网络结构的表征

本文论证了在交联点为三分枝的固化反应中,每一对未反应的基团使固化产物有效链损失数目为常数3。ΣA_(ai)—ΣB_(bj) 型固化反应的交联密度是官能团密度、有效数均官能度、配料比、固化体系凝胶分数、A(或B)基凝胶相反应程度、A_(ai)(或B_(bj))链节凝胶分数的函数。后两个不能直接测定的参数,可通过测定固化反应体系溶胶分数及溶胶相 A 基和 B 基的反应程度而获得。

CHARACTERIZATION OF NETWORK STRUCTURE IN CURING REACTION

The present paper demonstrates that every pair of unreacted groups in the cross-linked network loss a canstant of 3 for the number of effective segment in the curing reaction which produces three branch cross-linking point. The cross-link density of ∑Aai-∑Bbi type curing reaction is a function of the functional density, the effective number average functionality, the ratio of number of curing agent groups to prepolymer reactive groups, the gel fraction of curing system, the extent of reaction of A (or B) groups in gel phase and the gel fraction of Aai (or Bbi) segment The last two parameters can not be determined directly, but can be calculated by determining the sol fraction and the extent of reaction of A groups and B groups in sol phase.