六(甲氧基甲基)三聚氰胺/多元醇/二甲基丙烯酸酯的混合体系的聚合

六(甲氧基甲基)三聚氰胺(HMMM)-二缩三乙二醇(T_3EG)和二缩三乙二醇二甲基丙烯酸酯(T_3EGMA)的混合体系加入潜酸催化剂后,在较高温度下可同时进行缩聚和自由基聚合并表现出协同效应.在这一混合聚合体系中HM-MM不仅是交联剂,而且是体系中活泼亚甲基氧化为过氧化氢物的催化剂,由潜酸催化剂分解出的酸是缩聚的催化剂,也是过氧化氢物分解为自由基的催化剂,生成的自由基可引发T_3EGMA聚合.有关凝胶时间实验,吸氧实验和活性氧测定的结果支持上述论断.

HYBRID POLYMERIZATION OF HMMM/POLYOL AND DIMETHACRYLATE SYSTEM

The mixture of Hexamethoxymethylmelamine(HMMM)-triethylene glycol(T3EG) and triethylene glycol dimethacrylate(T3EGMA) can be cured by hybrid polymerization consisted of condensation polymerisation and radical polymerisation at higher temperature in presence of latent acid catalyst such as t-2-hydroxy-cyclohexyl tosylate(TCHTS) without radical initiator. This mixture system provides a synergetic effect on curing reaction, and that has been attributed to the presence of adventitious peroxides and the conversion of peroxides to initiating radicals. It has been considered that The HMMM is not only a crosslinking agent but also an accelerater of the oxidation of active methylene groups, and the acid generated from TCHTS plays the role of the catalysts for the conversion of hydroperoxides into free radicals as well as for the transetherification. This consideration is supported by the results of the oxygen absorption examination, active oxygen content determination and gel time studies.