文献类型：期刊文献

英文题名：Synthesis and copolymerization of benzoxazines with low-dielectric constants and high thermal stability

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

机构：[1]E China Univ Sci & Technol, Minist Educ, Key Lab Specially Funct Polymer Mat & Related Tec, Shanghai 200237, Peoples R China

年份：2013

卷号：3

期号：15

起止页码：5261

外文期刊名：RSC ADVANCES

收录：;EI(收录号：20132216372588);WOS:【SCI-EXPANDED(收录号:WOS:000316226500053)】；

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：Thermodynamic stability - Curing - Dielectric losses - Differential scanning calorimetry - Monomers

摘要：Two novel bridged benzoxazole-based benzoxazine monomers, HOH-a and FOH-a, were synthesized using a non-solvent method. The structure of HOH-a and FOH-a was confirmed by Fourier transform infrared spectroscopy (FTIR), H-1 NMR, and elemental analysis. The curing behaviors of these two monomers were studied by differential scanning calorimetry and FTIR. The corresponding polybenzoxazines, poly(HOH-a) and poly(FOH-a), display higher thermal stability than the polybenzoxazine from common bisphenol-Abased benzoxazine (BA-a), especially the char yields at 800 degrees C, which are 61% and 62% for poly(HOH-a) and poly(FOH-a), respectively. Moreover, the dielectric constants and dielectric loss of these polybenzoxazines are low and change slightly at room temperature in the frequency range of 0.1 Hz to 1 MHz. The dielectric constant of poly(FOH-a) in 1 MHz is only 2.21. Furthermore, poly(HOH-a/BA-a) and poly(FOH-a/BA-a) copolymers were prepared, and the thermal stability and dielectric and mechanical properties of these copolymers were studied. The flexural modulus and flexural strength of the poly(FOH-a/BA-a) copolymer can be increased to 66% and 41%, respectively, after the addition of 20 wt.% FOH-a.