PMMA/(BaTiO_3@PMMA核壳结构纳米颗粒)高导热有机高分子体系  

Highly Thermal Conductive Organic Polymer System of PMMA/(Core-shell Structured BaTiO_3@PMMA Nanoparticles)

作　　者：吴新锋[1,2] 王瑛[1] 江平开[2] 张福华[1] 张希琴[1] 杨开亮[1] 

机构地区：[1]上海海事大学海洋科学与工程学院材料系,上海201306 [2]上海交通大学化学化工学院材料系,上海200240

出　　处：《有机化学》2014年第11期2309-2316,共8页Chinese Journal of Organic Chemistry

基　　金：国家重点基础研究发展计划(973计划;No.2014CB643306);国家自然科学基金(Nos.51403124;51303034)资助项目~~

摘　　要：首次使用可逆加成断裂链转移(RAFT)聚合方法,制备了BaTiO3@PMMA核壳结构纳米颗粒,颗粒壳层具有厚度均匀、可控等特点,并将其添加到聚甲基丙烯酸甲酯(PMMA)基体中制备了颗粒分散均匀的高导热性能有机高分子体系.通过FT-IR,1H NMR,TGA以及TEM等测试技术对其化学结构和微观形貌进行了表征,证明BaTiO3表面包覆了一层完整的PMMA有机高分子,所制备的复合粒子具有明显的核壳结构.研究表明,当BaTiO3纳米颗粒添加量达到50%体积含量时,添加未改性的BaTiO3纳米颗粒的高分子体系的导热系数为0.894 W·m-1·K-1,而添加BaTiO3@PMMA核壳结构纳米杂化颗粒的高分子体系达到了1.137 W·m-1·K-1;同时,两种高导热高分子体系的体积电阻率均保持在1015Ω·cm以上,仍然具有良好的电绝缘性能.A simple method to fabricate core-shell structured BaTiO3@PMMA hybrid nanoparticles via surface initiated re-versible addition-fragmentation chain transfer （RAFT） polymerization is reported. And the effects of functionalization BaTiO3 nanoparticles on thermal properties of polymethyl methacrylate （PMMA） composites are investigated. The functionalized BaTiO3 nanoparticles were characterized by fourier-transform infrared （FT-IR）, nuclear magnetic resonance （1H NMR）, ther-mogravimetric analyzer （TGA）, and transmission electron microscopy （TEM）, which prove that a layer of PMMA polymer completely coated on the BaTiO3 surface, and the hybrid nanoparticles exhibit obvious core-shell structure. PMMA compos-ites were fabricated by incorporating two kinds of fillers：the as-received BaTiO3 nanoparticles and core-shell structured Ba-TiO3@PMMA hybrid nanoparticles. The study of the thermal conductivity properties and electrical insulation performance of the composite materials indicates that BaTiO3@PMMA results in a strong interface and thus the corresponding PMMA com-posites exhibit significantly increased thermal conductivity than PMMA composites filled with the as-received BaTiO3 nanoparticles. When the volume content of BaTiO3 nanoparticles is up to 50%, the thermal conductivity of the composite ma-terials which filled with the as-received BaTiO3 nanoparticles is 0.894 W·m-1·K-1, and the thermal conductivity of the com-posite materials which filled with the core-shell structured BaTiO3@PMMA hybrid nanoparticles is 1.137 W·m-1·K-1. In addition, the two kinds of highly thermal conductive polymer composites still have a good electrical insulating performance and the volume resistivity is maintained at 1015Ω·cm above.

关 键 词：高分子体系 导热 绝缘 核壳结构 可逆加成断裂链转移(RAFT)聚合 

分 类 号：O631.23[理学—高分子化学] TB383.1[理学—化学]