苯乙烯/丙烯酸正丁酯/丙烯酸共聚微球的制备及其性能表征

Preparation and Characterization of Poly(styrene/n-butyl acrylate/acrylic acid) Microspheres

通过乳液聚合法和无皂乳液聚合法制备了苯乙烯/丙烯酸正丁酯/丙烯酸共聚微球。讨论了乳化剂用量、引发剂用量、功能单体、软硬单体用量比等对微球粒径和形态的影响。利用扫描电子显微镜(SEM)、傅立叶变换红外光谱仪(FTIR)对微球的粒径、形貌和表面基团进行分析。红外光谱表明,实验室所制备的苯乙烯/丙烯酸正丁酯/丙烯酸共聚微球表面存在丰富的羧基。利用竖片生长法得到自组装的多层胶体微球薄膜。通过对薄膜的反射光谱测量,发现随着湿度的增加,峰位会产生3nm左右的红移。

In the paper, poly （styrene/n-butyl acrylate/acrylic acid） microspheres were prepared by. the emulsion polymerization and the soap-free emulsion polymerization. The influence of emulsifier content, initiator content, functional monomer and the content ratio of soft and hard monomers on the microspheres radius and conformation were discussed. The radius.morphology and surface groups of the microspheres were analyzed by means of SEM and FTIR. The microspheres were assembled into compact colloidal crystal films by vertical growth method. The reflectance spectra of the film （280nm） under 30% and 90% humidity were measured respectively, and it was found that there were about 3nm red-shift of the wavelength of the peak with the increase of the humidity.