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首页> 外文期刊>Polymers for advanced technologies >Synthesis and characterization of multifunctional propenyl-endcapped aromatic co-monomers and their use as bismaleimide modifiers
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Synthesis and characterization of multifunctional propenyl-endcapped aromatic co-monomers and their use as bismaleimide modifiers

机译：多功能丙烯基封端的芳香族共聚单体的合成，表征及其作为双马来酰亚胺改性剂的用途

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摘要

A series of novel modifiers for bismaleimide, bearing propenyl and phenoxy functional groups has been synthesized. Structural information of the monomers was obtained through Fourier transform infrared spectroscopy (FT-IR), nuclear magnetic resonance (NMR) spectroscopy and elemental analysis. Polymerization characteristics demonstrate that all four systems prepared have a cure temperature below 210 degrees C. This remarkably lower cure temperature compared to that of other polymerization reactions involving diallyl bisphenol A and bismaleimide (DBMI) originates from propenyl groups being present in the structures as well as their larger free volume. The rheological behaviors leading to low melt viscosities and the wide process window of the prepolymer are particularly suitable characteristics for the production of performance resin-based composite materials via resin transfer molding processes. The dynamic mechanical analysis of the materials reveals glass transition temperatures in a range between 260 degrees C and 293 degrees C. Thermal stabilities show a 5% weight loss at temperatures ranging from 363 degrees C to 428 degrees C with the production of char ranging from 38.5% to 57.6% at 800 degrees C under nitrogen. The latter is a clear indication for the excellent thermal stabilities featured by the cured resins. Furthermore, the dielectric properties exhibit a significantly lower dielectric constant and dissipation factors of the propenyl-modified cured systems compared to those of DBMI resins at 10 GHz. Copyright (C) 2015 John Wiley & Sons, Ltd.
机译：合成了一系列带有丙烯基和苯氧基官能团的双马来酰亚胺新型改性剂。通过傅立叶变换红外光谱（FT-IR），核磁共振（NMR）光谱和元素分析获得单体的结构信息。聚合特性表明，所制备的所有四个体系的固化温度均低于210摄氏度。与涉及二烯丙基双酚A和双马来酰亚胺（DBMI）的其他聚合反应相比，该固化温度显着降低，该聚合反应源自结构中存在的丙烯基以及他们更大的免费数量。导致低熔体粘度的流变行为和预聚物的宽加工范围是通过树脂传递模塑工艺生产高性能树脂基复合材料的特别合适的特性。材料的动态力学分析表明，玻璃化转变温度在260摄氏度至293摄氏度之间。热稳定性表明，在363摄氏度至428摄氏度的温度范围内，重量损失了5％，而炭的生成范围为38.5摄氏度。氮下，在800摄氏度下，碳氢化合物的含量为50.6％-57.6％。后者清楚地表明了固化树脂具有出色的热稳定性。此外，与10 GHz的DBMI树脂相比，丙烯基改性的固化体系的介电性能表现出明显更低的介电常数和耗散因数。版权所有（C）2015 John Wiley＆Sons，Ltd.

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