文献类型：期刊文献

英文题名：A New Benzoxazine Containing Benzoxazole-Functionalized Polyhedral Oligomeric Silsesquioxane and the Corresponding Polybenzoxazine Nanocomposites

作者：Zhang, Kan[1];Zhuang, Qixin[1];Liu, Xiaoyun[1];Yang, Guang[1];Cai, Ruilong[1];Han, Zhewen[1]

机构：[1]E China Univ Sci & Technol, Sch Mat Sci & Engn, Minist Educ, Key Lab Ultrafine Mat, Shanghai 200237, Peoples R China

年份：2013

卷号：46

期号：7

起止页码：2696

外文期刊名：MACROMOLECULES

收录：;EI(收录号：20131616206261);WOS:【SCI-EXPANDED(收录号:WOS:000317438300019)】；

基金：The authors express their gratitude to the National Natural Science Foundation of China (NSFC) for their financial support. Contract Grant Number is 50973028. This project is also supported by the Shanghai Natural Science Foundation (12ZR1407900).

语种：英文

外文关键词：Differential scanning calorimetry - Dielectric losses - Oligomers - Thermogravimetric analysis - Fourier transform infrared spectroscopy - High resolution transmission electron microscopy - Silicon compounds

摘要：A new benzoxazole-modified [PhSiO1.5](8)(OPS) benzoxazine (OPS-Bz) was synthesized and used to prepare polyhedral oligomeric silsesquioxane (POSS)/ polybenzoxazine (PBz) nanocomposites. Fourier transform infrared spectroscopy (FTIR), H-1 NMR, Si-29 NMR, differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) were used to characterize the structure of OPS-Bz. The high resolution transmission electron microscopy images of POSS/PBz(30/70) nanocomposites showed a well separated nanostructure of POSS with a typical phase size of 3-10 nm. POSS was highly dispersed in the polymer matrix because of the benzoicazole groups around the OPS molecular, in which the rigid benzoxazole groups increased the distance among the POSS molecules and reduced the aggregation of POSS nanoparticles. The TGA study showed these nanocomposites possess good thermal stability. Moreover, the dielectric constants and dielectric loss of these POSS/PBz nanocomposites were low and changed slightly at room temperature in the frequency range of 10 Hz to 1 MHz.