树状硅基大分子光引发剂的合成与表征

从Vogtle等1]首次描述了“串级式”合成方法以来,以及Newkome2]和Tomalia等3]的重要贡献,具有完美的支化结构、高度对称且分子大小可精确控制的树状分子在当代化学领域中已经成为一个重要的研究方向,其新颖的结构,独特的性能吸引了众多科学工作者的兴趣4,5].其中硅基树状分子,尤其是树状聚硅碳烷大分子由于具有可变的支化度、无论是动力学还是热力学上的高度稳定性的优点,以及Si—Cl、Si—H、Si—OH等基团的的存在使得易于根据不同的需要对树状大分子进一步功能化改性,已成为高分子领域的研究热点6,7],例如树状硅碳烷液晶8~10]、…

SYNTHESIS AND CHARACTERIZATION OF DENDRITIC CARBOSILANE BASED MACROPHOTOINITIATOR

A carbosilane dendrimer based macrophotoinitiator(MPI-185) containing benzophenone moiety terminal groups was synthesized by a divergent hydrosilylation/allylation reaction sequence followed by alcoholysis of the silicon chloride end groups.The structure of MPI-185 was characterized by FTIR,()~1H-NMR,()~(13)C-NMR,and()~(29)Si-NMR,and its intrinsic viscosity,molecular weight and polydispersity were meassured on by using a GPC complex system.Its reactivity was tested via curing a sensitive epoxy acrylate(EA) resin using FTIR,and the thermal property of films cured was measured by TGA.The results were compared with those of a small molecule photoinitiator(185).It was found that the curring efficiency of macrophoinitiator(MPI-185) was satisfactory,and the thermal degradation temperature of EA resin cured with MPI-185 was also markedly improved.