超支化聚硅氧基硅烷的合成及紫外光固化动力学

通过含硅氢键的超支化聚合物和乙烯基三烯丙基硅烷在铂炭催化剂作用下反应制备了可紫外光固化的超支化聚硅氧基硅烷。利用FT-IR,1H-NMR,13C-NMR,29Si-NMR和SEC/MALLS表征确定了聚合物的分子结构。通过UV-DSC研究了在不同温度、光强和氛围中聚合物的紫外光固化行为,给出了在这些条件下热流和转化率对时间的关系曲线。借助数学软件Matlab7.1将实验数据和动力学方程进行拟合,求得了动力学参数。

Hyperbranched Poly(Siloxysilane) and Its UV Curing Kinetics

UV-curable hyperbranched poly(siloxysilane) was synthesized via organosilicon polymer bearing silicon hydride end groups and vinyltriallylsilane at the presence of Pt/C catalyst.FT-IR,1H-NMR,13C-NMR,29Si-NMR and SEC/MALLS were employed to identify the structure of the polymer.UV curing experiments were conducted at different temperature,light intensity and atmosphere through UV-DSC.The relations of heating flow and conversion versus time at different temperature,light intensity and atmosphere were studied.The results reveal that the acceleration of light intensity to curing reaction is selective to temperature,and the termination of polymerization by oxygen is not remarkable at room temperature or below.The kinetic parameters were obtained by curvefitting of the experimental data with experiential formula(which is operated in software Matlab7.1).Compared with the experimental curves,the theoretic model showed well accordance.Curing active energy Ea and frequency gene A were obtained by plot of lnk versus-1/RT.