论文部分内容阅读
采用低速搅拌悬浮聚合制得了一系列磁性聚甲基丙烯酸甲酯(PMMA)微珠.分别以聚乙烯醇(PVA1788)和碱式碳酸镁作为稳定剂和助分散剂,Fe3O4磁流体为磁性物质,双甲基丙烯酸甲酯为交联剂.所有粒子的直径在1～3mm范围内,微球的粒径及其分布可以通过改变聚合反应介质来进行调节.着重研究了反应体系中电解质的用量、聚合反应温度、水油比、碱式碳酸镁及交联剂的用量等反应参数对微球粒径的影响.利用振动探针式磁强计(VSM)和原子吸收光谱(AAS)分别对磁性PMMA微珠的超顺磁性和Fe3O4含量进行了表征.
A series of magnetic polymethylmethacrylate (PMMA) beads were prepared by low-speed stirring suspension polymerization.The polyvinyl alcohol (PVA1788) and basic magnesium carbonate were used as stabilizers and dispersants respectively, and the magnetic fluid of Fe3O4 was magnetic material, Methyl methacrylate as cross-linking agent.All the diameter of the particles in the range of 1 ~ 3mm, the particle size and distribution of the microspheres can be adjusted by changing the polymerization medium.This paper focuses on the amount of electrolyte in the reaction system, Polymerization temperature, water-oil ratio, the amount of basic magnesium carbonate and the amount of cross-linking agent on the particle size of the microspheres were investigated.Vibrational magnetometer The superparamagnetism and Fe3O4 content of PMMA beads were characterized.