季戊四醇四(3-巯基丙酸)酯/乙烯基硅氮烷体系光聚合反应动力学红外光谱法研究

用傅立叶变换红外光谱法研究了季戊四醇四(3-巯基丙酸)酯/乙烯基硅氮烷体系光聚合反应动力学,跟踪检测了巯基和乙烯基吸光度的变化,测定了光聚合反应过程的巯基和乙烯基的转化率,发现巯基与乙烯基以化学计量比1∶1反应。在巯基和乙烯基物质的量相等和乙烯基过量的情况下,按照一级反应处理的动力学数据都得到较好的线性关系,且反应速率与巯基浓度的一次方成正比。

Study on the photopolymerization kinetics of thiol-vinyl silazane system by infrared spectrum method

The Fourier transform infrared spectrometry was used to monitor the conversion of both thiol and vinyl functional groups independently during the photopolymerizing reaction of ceramic precursor monomer PSN-1 with pentaerythritol tetra(3-mercaptopropionate),and which was also used to investigate the reaction dynamics.The results indicated that the stoichiometric ratio of thiol to vinyl during the polymerization reaction was 1 ∶1.When the quantity(molar) of thiol and vinyl was the same or the latter was superfluous,and the dynamic data were simulated according to the first order reaction model,then a preferable linear relation of the kinetic ones were obtained,further more,the reaction rate was proportional to one power of the concentration of the thiol group.