pH温度双敏感磁性微球的分散聚合、表征及吸附性能研究

DISPERSION POLYMERIZATION AND CHARACTERIZATION OF TEMPERATURE-SENSITIVE MAGNETIC MICROSPHERES WITH pH ORIENTATION AND ADSORPTIVE PROPERTY

摘要:

在Fe3O4磁流体存在的条件下，以苯乙烯、甲基丙烯酸、N,N-亚甲基双丙烯酰胺、N-异丙基丙烯酰胺为共聚单体，在醇-水体系中采用分散聚合法制备了具有pH值敏感和温度敏感性的磁性高分子微球。采用扫描电镜 (SEM) 等考察了双敏感磁性微球的形态及结构，测得磁性微球的粒径约为1.5μm。研究了双敏感磁性微球对牛血清蛋白的吸附动力学性能，36h时的平衡吸附量为565.6mmol/g。吸附过程具有Freundlich等温吸附特征。

Abstract:

The magnetic microspheres with pH- and thermo-sensitivity were prepared by dispersion polymerization in the presence of Fe3O4 magnetic fluid in an ethanol/water medium, using styrene, methacrylic acid, N,N-methylene-bis-acrylamide and N-isopropylacrylamide as comonomers. The morphology of the magnetic microspheres was studied by SEM. The diameter of microspheres was 1.5μm. The adsorption kinetics of bovine serum albumin were investigated. The equilibrium adsorption capacity was 565.6mmol/g. The adsorption kinetic was controlled by liquid film diffusion. The adsorption process could be described by Freundlich model.