微米级聚苯乙烯/聚硅氧烷核壳微球的制备、表征及其作为光散射剂的应用

Preparation, characterization and application as light scattering agents of micron-size polystyrene/polysiloxane core/shell microspheres

在乙醇/水混合溶剂中采用分散聚合法制备出微米级聚苯乙烯微球,将聚苯乙烯核微球与甲基三甲氧基硅烷的水解溶液混合,加入氨水使硅烷水解产物在核表面缩合交联,制备出微米级聚苯乙烯/聚硅氧烷核壳微球.采用TEM、粒径分布仪、EDX、TG等对核壳微球的形貌、粒径、表面成分和热失重进行了表征.将核壳微球作为光散射剂添加在聚甲基丙烯酸甲酯(PMMA)树脂中,制备出性能良好的光散射材料.当SS6核壳微球的添加浓度为1%(质量)时,制得的PMMA样片(2mm)的雾度为88.16%,透光率为72.5%;当SS6添加浓度为2%(质量)时,其雾度为92.13%.

Micron-size polystyrene （PS）/polysiloxane microspheres with core/shell structure were synthesized. Firstly, polystyrene microspheres were prepared by conventional dispersion polymerization in an ethanol-water medium. Secondly, methyl trimethoxylsilane was hydrolyzed, mixed with the polystyrene core microspheres and then condensed to generate polysiloxane shells in the surface of PS microspheres by adding an aqueous NH4 OH as catalyst. The shape, size distribution, surface composition and thermo decomposition of core/shell microspheres were investigated with TEM, size analyzer, EDX and TG respectively. This core/shell microspheres as light scattering agents were blended with polymethyl methacylate （PMMA） resin to prepare light scattering material. When the concentration of core/shell microspheres SS6 was 1% （mass）, the haze of PMMA sheet （2mm） was 88. 16%, transmittance was 72.5%. When the concentration of SS6 was 2% （mass）, the haze of PMMA sheet was 92.13%.