磁性聚乙烯醇微球的制备及其性质

Preparation and Characteristics of Magnetic Polyvinyl Alcohol Microspheres

采用分散聚合法，在Fe3O4磁流体存在下，通过PVA分子单体共聚制备磁性高分子微球。用透射电镜和X射线对磁流体的形貌、粒径进行表征和衍射分析，同时借助于显微拍照和红外光谱，对磁性微球的微观形貌和化学成分进行了研究。通过对比磁性微球的磁响应性及粒径，研究了反应温度、搅拌速度、聚乙烯醇用量、盐酸用量等操作因素对磁性微球性质的影响。结果表明，在70℃操作温度、750r／min的搅拌速度，5ml9％PVA和0．5ml37%盐酸条件下能制备出粒径在8～44μm之间、具有良好磁响应性、表面富含羟基和羧基等官能团的磁性聚乙烯醇微球。

Magnetic microspheres are prepared with Fe304 magnetic fluid and PVA by dispersion and copolymerization. The appearance and diameter of the magnetic fluid are determined by TEM and XRD, and the appearance and composition of magnetic polymer microspheres are researched by microscope and infrared. Temperature, stirring rate, PVA amount and HCl amount are estimated through comparing the magnetic responsiveness and the diameter of magnetic polymer microspheres. The results show that optimum temperature,optimum stirring rate,optimum PVA and optimum HCl of the preparation of the magnetic polymer microspheres are 70℃, 750r/min,0. 5ml 9 % and 0. 5ml 37%, respectively. The magnetic polymer microspheres with diametar of 8-44μm have good magnetic responsiveness and the functional groups on the surface.