Synthesis of iron oxide/poly(methyl methacrylate) composite latex particles: Nucleation mechanism and morphology
Synthesis of iron oxide/poly(methyl methacrylate) composite latex particles: Nucleation mechanism and morphology
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DOI：
10.1002/pola.20335
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发表时间：
2004-11
期刊：
影响因子：
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通讯作者：
Pingnuo Wang;W. Chiu;Chia-Fen Lee;T. Young
中科院分区：
文献类型：
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作者：
Pingnuo Wang;W. Chiu;Chia-Fen Lee;T. Young
采用无皂乳液聚合法制备了磁性聚甲基丙烯酸甲酯（PMMA）复合乳液，并采用共沉淀法制备了磁性磁流体。详细考察了单体浓度、磁流体含量、引发剂浓度等聚合参数对磁性复合乳胶粒的转化率曲线和粒径的影响。结果表明，根据聚合条件的不同，成核机理有两种。在富单体、少单体的磁流体体系中，PMMA的自成核在整个乳液聚合过程中占主导地位。在富磁流体体系中，种子乳液聚合是形成磁性复合乳胶粒的主要过程。
A magnetic poly(methyl methacrylate) (PMMA) composite latex was prepared by soapless emulsion polymerization in the presence of ferrofluid, and the ferrofluid was prepared by means of a coprecipitation method. The effects of various polymerization parameters, such as the monomer concentration, ferrofluid content, and initiator concentration, on the conversion curve and particle size of the magnetic composite latex particles were examined in detail. The results showed that two nucleation mechanisms were involved according to the polymerization conditions. In the monomer-rich and less ferrofluid system, self-nucleation of PMMA was dominant over the entire course of emulsion polymerization. In the ferrofluid-rich system, seeded emulsion polymerization was the main course to form the magnetic composite latex particles.