PMMA/PS复合光散射材料的制备和表征

通过将苯乙烯（St）一定时间的聚合产物（散射添加物）与甲基丙烯酸甲酯（MMA）单体进行原位聚合，制备透明、高散射、导光聚合物体散射材料。对材料的光学性能测试表明：调节散射添加物的用量，可以调控材料的透光率和雾度，透光率随着添加物用量的增加而下降，雾度随添加物用量的增加而上升，材料的透光率能够大于85%，雾度大于80%；对材料的红外分析表明光散射材料的散射基体为聚甲基丙烯酸甲酯（PMMA）；反应体系温度的变化使材料的分子量具有双峰分布；材料的分子质量分布介于3.0与3.5之间；材料的微观结构分析表明：聚苯乙烯(PS)均匀的分布在PMMA基体中，其尺寸与可见光波长相当或略小；随着添加物用量的增加，分散在PMMA基体中的PS的粒径增加，分布的密度减少。

Preparation and characterization of polymethyl methacrylate/polystyrene (PMMA/PS) composite light scattering material

A polymeric scattering material with high transparence and high light scattering ability was prepared by polymerization of methyl methacrylate(MMA) in the presence of the scattering additive substance.Characterization of its optical properties indicated that the transmittance and haze of the polymer composite could be adjusted by changing the content of the scattering additive substance.With increasing of the additive substance content,the transmittance decreased and the haze increased.The maximum transmittance of the resulting material was >85% with the haze <80%.IR spectroscopy indicated that the matrix of the light-scattering material was polymethyl methacrylate(PMMA).The molecular weight distribution was between 3.0 and 3.5,and the polymeric material had a bimodal molecular weight distribution since the polymerization was carried out in two stages at different temperatures.The microstructure of the material showed that polystyrene(PS) was dispersed homogeneously in the PMMA matrix,with particles size similar to,or slightly smaller than the wavelength of visible light.With increasing content of the scattering additive substance,the size of PS particles dispersed in the PMMA matrix increased and the extent of distribution decreased.