聚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.pdfVIP

《化学通报》在线预览版 聚苯乙烯/丙烯酸正丁酯/丙烯酸共聚微球的制备及其性能表征 ∗ 谢桃华 蓝鼎 王育人 姚灿 马文杰 （中国科学院力学研究所国家微重力实验室 北京 100080） 摘要 通过乳液聚合法和无皂乳液聚合法制备了聚苯乙烯/丙烯酸正丁酯/丙烯酸微球。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）、傅里叶变换红外光谱仪（FTIR） 对微球的粒径、形貌和表面基团进行分析。红外光谱表明，实验室所制备的聚苯乙烯/丙烯酸正丁酯/丙烯酸微球表面存 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。 关键词 高分子微球 乳液聚合 表面改性 红外光谱 Preparation and Characterization of Poly(styrene/ n-butyl acrylate/acrylic acid) Microspheres ∗ Xie Taohua, Lan Ding, Wang Yuren , Yao Can, Ma Wenjie (National Microgravity Laboratory, Institute of Mechanics, Chinese Academy of Sciences, Beijing, 100080) Abstract 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. Key words Polymer microspheres, Emulsion polymerization, Surface modification, IR 高分子微球的合成与研究是高分子科学中的一个重要研究领域。微球比表面积大，吸附性强，凝聚性 好，适于作为一些物质的固定载体[1]。另外，由于粒子大小的可控性好，表面反应活性高，因而在生物 医学和电子信息方面应用广泛。例如，Han 等[2]以聚乳酸为膜材制备成注射剂，用于治疗胃溃疡。Zhao 等[3]