巯基化合物/乙烯基聚硅氮烷光固化体系的研究

Research on Thiol-vinyl Silizane Polymerized by UV

采用三种巯基化合物作为含乙烯基聚硅氮烷(PSN-1)的光固化剂,研究了三种巯基化合物与PSN-1的反应动力学,并对光固化产物进行了热重分析。结果表明:巯基化合物/PSN-1体系的反应速率与巯基浓度的一次方成正比,与乙烯基浓度无关,均为一级反应;四元巯基化合物比二元巯基化合物的初始反应速率快,而转化率偏低;四巯基季戊烷/PSN-1体系的陶瓷产率高达89%,更适合作先驱体转化法制备陶瓷材料的陶瓷先驱体。

Three types of thiol-ene compounds were used as photopolymerzation crosslinker for vinyl-polysilazane （PSN--1）. The reaction kinetics were studied between these three types of thiol-ene compounds and PSN--1, and thermogravimetric analysis （TGA） was carried out on the light-cured products. The results showed that reaction of thiol-ene compounds/PSN--1 was an first order reaction with the reaction rate directly proportional to the concentration of thiol-ene but not affected by with the concentration of the vinyl. The initial reaction rate of quaternary thiol-ene compounds was faster than that of bithiol-ene compounds, while the conversions was lower; the ceramic yield of 2,2-- bis（mercaptomethyl） -- 1,3-- propanedithiol/PSN-- 1 precursor was 89 % , which was more suitable to preparing ceramics.