分散聚合法制备微米级核壳复合粒子  

Preparation of Micrometer Core-shell Composite Particles via Dispersion Polymerization

作　　者：张星[1] 郑玉婴[1] 陈德贤[1] 

机构地区：[1]福州大学高分子科学与技术研究所,化学化工学院,福州350108

出　　处：《应用化学》2012年第1期37-40,共4页Chinese Journal of Applied Chemistry

基　　金：国家科技部科技人员服务企业项目(292009GJC40029);福建省科技计划重大专项专题项目(2007HZ0001-2);福建省科技创新平台建设计划项目(2010H2005)

摘　　要：在硬脂酸改性纳米CaCO3存在下进行了苯乙烯(St)和丙烯酸正丁酯(nBA)的分散共聚合,制备了平均粒径为1.76μm、单分散性较好的CaCO3/P(St-co-nBA)核壳复合粒子。包覆层聚合物P(St-co-nBA)与CaCO3粒子之间存在物理吸附和化学键合作用,使其热分解温度比共聚物P(St-co-nBA)高。经热二甲苯抽提后复合物中仍有共聚物存在,这部分共聚物与CaCO3通过化学键牢固的结合。热失重结果表明,CaCO3的稳定包覆率为6.6%。Narrow dispersed CaCO3/poly （ styrene-co-n-butylacrylate ） （ CaCO3/P （ St-co-nBA ） ） composite particles with average diameter of 1.76 μm were obtained via a dispersion copolymerization of St and nBA in the presence of stearic acid modified nano-CaCO3 particles. The products were characterized by transmission electron microscopy （ TEM ）, optical microscope （ OM ）, fourier transfer infrared spectroscopy （ FF-IR ）, thermogravimetric analysis （TGA）, and X-ray diffraction （XRD）. The TEM images indicated the composite particles had nano-CaCO3 core and P （St-co-nBA） shell structure. The TGA analysis results of composite particles before and after being extracted with dimethylbenzene showed the thermal decomposition temperature of the cladding polymer was higher than that of pure copolymer P（ St-co-nBA）, and some copolymer couldn＇t be extracted. The FF-IR spectra also confirmed the existence of copolymer on the composite particles after extracting. It suggested that the copolymer had chemical bonding with nano-CaCO3. The mass proportion of P（St-co-nBA） which couldnI be extracted with accounted for 6. 6% based on the mass of nano-CaCO3.

关 键 词：纳米碳酸钙 分散聚合 包覆 复合物 

分 类 号：O635.1[理学—高分子化学]