摘要
在高温熔融条件方法将高分子量聚硅氧烷(PMVS)与聚苯乙烯混合,冷却后再加入ZDMA、并以过氧化物为交联剂,在高温下固化获得了甲基乙烯基聚硅氧烷(PMVS)/ZDMA复合材料。采用光学显微技术、力学性能测试和动态机械性能测试(DMA)、热失重方法(TGA)对复合材料的结构力学性能和热性能进行了表征。实验结果发现,PMVS/ZDMA/PS树脂复合材料为不相容体系,微观上具有“一海双岛”式的相分离结构,在宏观上结构较为均匀。PS树脂可提升PMVS/ZDMA复合材料强度、模量和抗压性能,但伸长率有所降低。PMVS/ZDMA/PS树脂复合材料的阻尼因子由0.1增大至0.32,在55~199 ℃范围内的阻尼性能大为改善。PS的加入使得复合材料在400 ℃以下的热稳定性得以大幅提高,在430 ℃下的DTG峰随着PS含量增加而增高、显示与PS的热分解直接相关。
The high molecular polymethylvinilsiloxane (PMVS) was blended with melted polystyrene resin at high temperature. After cooling down to R.T., the ZDMA and organicperoxde as curative was added. The composition mixed above was hot-pressed and crosslinked, and then polymethylvinylsiloxane/ZDMA/PS composites was gotten. The structure and properties of the composites were characterized by optic microscope, mechanical tests, dynamic mechanical analysis (DMA), and thermalgravimetric analysis (TGA) methods. The results revealed that the PMVS/ZDMA/PS resin composites were incompatible system of micro phase separation characteristics with one-sea and two-islands structure, which is comparatively homogeneous in macroscopic view. The PS resin could increase the compressive strength and modulus of PMVS/ZDMA composites, while its elongation decreased sharply. The loss factor (tanδ) of PMVS/ZDMA/PS compsites increased from 0.1 to 0.32, and the damping properties greatly improved in the temperature range of 55-199 degree. The heat resistance of the composites under 400 degree C was improved greatly while the PS added, and the height of DTG peak at 430 degree C increased with the PS addition, which showed that the DTG peak straight related to the decomposition of PS resin.
作者
雷卫华
孙素明
周安伟
陈立新
LEI Weihua;SUN Suming;ZHOU Anwei;CHEN Lixin(The Institute of Chemical Materials CAEP, Mianyang 621900,China)
出处
《功能材料》
EI
CAS
CSCD
北大核心
2019年第12期12013-12019,共7页
Journal of Functional Materials
