羧基功能化聚甲基丙烯酸甲酯微球的制备与表征

Synthesis and characterization of functional PMMA micrspheres with carboxyl surface

采用分散聚合、无皂乳液聚合,经皂化水解,分别制备出羧基含量不同的4种单分散功能化聚甲基丙烯酸甲酯微球。利用FT-IR、SEM、电导率等手段研究了不同制备方法,皂化过程等对微球的形态、表面羧基含量的影响,结果显示:通过改变反应原料配比、皂化时间等能可控制备出0.25μm、0.45μm、0.8μm等粒径不同的羧基功能化微球;利用丙烯酸修饰的聚甲基丙烯酸甲酯微球经皂化水解可显著提升微球表面的羧基含量至0.26mmol/g。

Poly（methyl methacrylate）microspheres with different size and contents of carboxyl groups on the surface were controlly prepared by dispersion and soap-free emulsion polymerization separately.The size and carboxyl content of microspheres were characterized by FT-IR,SEM and conductrance titration.The results indicated that the monodisperse microspheres with sizes ranging from 0.25 to 1μm can be obtained by controlling material ratio and saponification time.The carboxyl content of PMMA microspheres modified by acrylic acid can be marked promoted to 0.26mmol/g by saponification.