摘要
十六烷基三甲基溴化铵(CTAB)对氧化石墨烯(GO)表面化学接枝改性后,获得的改性氧化石墨烯(mGO)在苯乙烯(St)和丙烯酸丁酯(BA)单体中的分散性及相亲性均有提高,可以作为稳定的水性Pickering分散剂参与乳液共聚反应,得到mGO/聚丙烯酸酯Pikcering复合乳液.通过原子力显微镜(AFM)、傅里叶红外光谱(FTIR)、光学照片、粒径分析、透射电子显微镜(TEM)等分析表征,考察了GO改性前后复合乳液结构及涂膜性能的变化,探讨了mGO的加入对聚合物乳胶粒子的粒径大小、分散性等影响.结果表明:当mGO含量为0.01%～0.20%时,乳液的单分散性和稳定性最好,mGO片层包覆于聚合物乳胶粒子表面使复合乳胶粒子形成核壳结构,若mGO含量在0.20%以上乳胶粒子结构稳定性变差.将mGO/聚丙烯酸酯复合乳液干燥成膜,可得到柔性、透明的mGO/聚丙烯酸酯复合乳液膜.对其导热性能进行测试分析发现:当mGO含量为0.01%～0.20%时,复合乳液膜的热导率随mGO含量增加而升高,在mGO含量为0.20%时达到最高值0.358W/mK,相较纯聚丙烯酸酯乳液膜的热导率提高49%.由于mGO在复合乳液膜中形成三维网络结构,导致mGO/聚丙烯酸酯复合乳液膜的热稳定性和热机械性能也有明显提升.
Modified graphene oxide(mGO)was prepared through a chemical graft process and used as a stabilizing additive in the Pickering polymerization process due to its improved affinity for styrene(St)and butyl acrylate(BA)monomers.The structure and performance of mGO and mGO/polyacrylate latex particles was characterized by AFM,FTIR,optical images,particle size analysis and TEM analysis,etc.The results show that excellent monodispersity and structure stability were obtained by introducing mGO to the polyacrylate latex,mGO was evenly coated upon the polymer latex particle surface to form a core-shell structure.Flexible and transparent mGO/polyacrylate latex films were prepared by drying the nanocomposite latex,thermal conductivity of the mGO/polyacrylate latex films increased with mGO content within range of 0.01% ~0.2%,and the highest conductivity arrived at 0.358 W/mK,which was 49% better than the pure polyacrylate latex films.Significant improvements on the thermal stability and thermal-mechanical properties provided by mGO were also investigated by utilizing TGA and thermomechanical analysis.
作者
倪伟男
吴刚
张新海
游波
NI Weinan;WU Gang;ZHANG Xinhai;YOU Bo(Department of Materials Science,Fudan University,Shanghai 200433,China;Advanced Coatings Research Center of Ministry of Educational of China,Fudan University,Shanghai 200433,China)
出处
《复旦学报（自然科学版）》
CAS
CSCD
北大核心
2018年第6期767-779,共13页
Journal of Fudan University：Natural Science
基金
上海商用飞机发动机联合创新项目(AR909).
