自由基交联共聚合体系凝胶点和凝胶形成机理

通过分析几个有代表性的单烯／二烯自由基交联模型的计算机模拟结果，认为凝胶点判据和凝胶形成机理是两个相互联系但决不相同的概念。将体系中首次出现分子平均交联密度等于１／ＤＰｐｗ的分子作为凝胶点判据。凝胶形成过程可分为成核与生长两个阶段，成核条件为溶胶分子平均交联密度等于１／ＤＰｐｗ。

Gel Point and Mechanism of Gel Formation in Copolymers from Free-Radical Crosslinking Polymerization of Vinyl/Divinyl Monomers

After discussing the results from the computer simulations of gel point in the vinyl/divinyl monomer free-radical crosslinking polymerization by several typical models, the authors proposed that gel point be distinguished from mechanism of gel formation. The crite-ria of gel point is the appearing of the macromolecule whose average crosslinking density is equal to However, the gel formation can have two processes of nucleation and growth, where the condition of nucleation is that the average crosslinking density in one macromolecule of a sol becomes 0