Jiang Hao, Ji Yanyan, Gan Jiantuo, Wang Lei
School of Materials Science and Engineering, Xi'an Shiyou University, Xi'an 710065, China.
Xi Jing Electric Corporation, Xi'an 710065, China.
Materials (Basel). 2020 Aug 31;13(17):3836. doi: 10.3390/ma13173836.
A thermosetting resin system, based on bismaleimide (BMI), has been developed via copolymerization of 4,4'-diaminodiphenylsulfone with a newly synthesized graphene oxide modified using epoxy silane (ES-GO). The effect of ES-GO on the thermomechanical and mechanical properties of cured modified resin was studied. To evaluate the efficiency of the modified BMI systems, the composite samples using glass fiber cloth were molded and tested. Thermogravimetric analysis indicates that the cured sample systems displays a high char yield at lower concentrations of ES-GO (≤0.5 wt.%), suggesting an improved thermal stability. Using dynamic mechanical analysis, a marked increase in glass transition temperature (Tg) with increasing ES-GO content was observed. Analysis of mechanical properties reveals a possible effect of ES-GO as a toughener. The results also showed that the addition of 0.3 wt.% ES-GO maximizes the toughness of the modified resin systems, which was further confirmed by the result of analysis of fracture surfaces. At the same time, a molded composite with ES-GO showed improved mechanical properties and retention rate at 150 °C as compared to that made with neat resin.
一种基于双马来酰亚胺（BMI）的热固性树脂体系，是通过4,4'-二氨基二苯砜与用环氧硅烷（ES-GO）改性的新合成氧化石墨烯共聚而开发的。研究了ES-GO对固化改性树脂的热机械性能和力学性能的影响。为了评估改性BMI体系的效率，使用玻璃纤维布模塑并测试了复合样品。热重分析表明，在较低浓度的ES-GO（≤0.5 wt.%）下，固化样品体系显示出高残炭率，表明热稳定性得到改善。使用动态力学分析，观察到随着ES-GO含量增加，玻璃化转变温度（Tg）显著升高。力学性能分析揭示了ES-GO作为增韧剂的可能作用。结果还表明，添加0.3 wt.%的ES-GO可使改性树脂体系的韧性最大化，断口表面分析结果进一步证实了这一点。同时，与纯树脂制成的模塑复合材料相比，含ES-GO的模塑复合材料在150℃时显示出改善的力学性能和保留率。
