SiO2包覆石墨烯/双马来酰亚胺复合材料的表征及性能  

Characterization and properties of SiO2-coated graphene/bismaleimide composites

作　　者：陈宇飞[1,2] 武耘仲 代国庆 李治国 滕成君 崔巍巍[2] CHEN Yufei;WU Yunzhong;DAI Guoqing;LI Zhiguo;TENG Chengjun;Cui Weiwei(Key Laboratory of Engineering Dielectrics and its Application,Ministry of Education,Harbin University of Science and Technology,Harbin 150080,China;College of Materials Science and Engineering,Harbin University of Science and Technology,Harbin 150040,China;Harbin Xiangfang District Center for Disease Control and Prevention,Harbin 150030,China)

机构地区：[1]哈尔滨理工大学工程电介质及应用技术教育部重点实验室,哈尔滨150080 [2]哈尔滨理工大学材料科学与工程学院,哈尔滨150040 [3]哈尔滨市香坊区疾病控制中心,哈尔滨150030

出　　处：《复合材料学报》2020年第5期1015-1023,共9页Acta Materiae Compositae Sinica

基　　金：国家自然科学基金(51177030);哈尔滨创新人才专项(2015RAXXJ029)。

摘　　要：采用硅烷偶联剂乙烯基三甲氧基硅烷(VTMO)改性石墨烯(GE),利用溶胶-凝胶法在GE表面包覆SiO2微球,得到SiO2包覆改性石墨烯(SiO2@(VTMO-GE)),以二烯丙基双酚A(BBA)和双酚A双烯丙基醚(BBE)为活性稀释剂,4,4′-二氨基二苯甲烷型双马树脂(MBMI)为单体,制备MBMI-BBA-BBE(MBAE)树脂基体;同时,以SiO2@(VTMO-GE)为增强体,采用原位聚合法制备SiO2@(VTMO-GE)/MBAE复合材料。对VTMO-GE及包覆效果进行表征和分析,研究SiO2@(VTMO-GE)增强体与SiO2@(VTMO-GE)/MBAE复合材料性能之间的关系。结果表明:VTMO成功改性GE,且SiO2微球均匀包覆在VTMO-GE表面;SiO2@(VTMO-GE)提高了SiO2@(VTMO-GE)/MBAE复合材料性能。当SiO2@(VTMO-GE)掺杂量为2.0wt%时,SiO2@(VTMOGE)/MBAE复合材料的冲击强度和弯曲强度达到最大,分别为23.0 kJ/m^2和157.4 MPa,较聚合物基体分别提高了150%和58%;在频率为10^2~10^4 Hz范围内,介电常数较为平稳,约为70.0;介电损耗约为3.7×10^-3,耐热性能随SiO2@(VTMO-GE)掺杂量的增加有所提高。SiO2@(VTMO-GE)/MBAE复合材料具有优异的综合性能,为其进一步应用奠定了基础。The silane coupling agent vinyl trimethoxysilane(VTMO) was used to modify graphene(GE), and SiO2 microspheres were coated on the surface of graphene by sol-gel method to obtain SiO2-coated modified graphene(SiO2@(VTMO-GE)). The 4,4′-diaminodiphenyl methane bismaleimide-diallyl bisphenol A-bisphenol A bisallyl ether(BBA-BBE-MBMI, MBAE) matrix was synthesized from BBA, BBE and MBMI, in which BBA and BBE were used as reactive diluents and MBMI was used as the monomer. The MBAE modified by SiO2-coated graphene(SiO2@(VTMO-GE)/MBAE) composites were prepared by in-situ polymerization with SiO2@(VTMO-GE) as the reinforcement. The effect of SiO2@(VTMO-GE) on the properties of the SiO2@(VTMO-GE)/MBAE composite was studied by characterizing and analyzing the VTMO-GE and the coating effect. The results show that GE is successfully modified by VTMO, and SiO2 microspheres are uniformly coated on the surface of VTMO-GE. The SiO2@(VTMO-GE)component improves global properties of the SiO2@(VTMO-GE)/MBAE composite. The impact strength and bending strength of the SiO2@(VTMO-GE)/MBAE composite reach the maximum of 23.0 kJ/m^2 and 157.4 MPa, respectively, which are 150% and 58% higher than that of the MBAE, when the content of SiO2@(VTMO-GE) is 2.0 wt%. The dielectric constant and the dielectric loss are about 70.0 and 3.7×10^–3 in the frequency range of 10^2–10^4 Hz, while the heat resistance enhances with the increase of SiO2@(VTMO-GE) amount. The SiO2@(VTMO-GE)/MBAE composite exhibits excellent global properties and lays the foundation for further application.

关 键 词：双马来酰亚胺 石墨烯 SIO2 力学性能 介电性能 

分 类 号：TB332[一般工业技术—材料科学与工程]