Synthesis and morphology of Fe3O4/polystyrene/poly(isopropylacrylamide‐co‐methyl acrylate acid) magnetic composite latex – 2,2′‐azobis (2‐methylpropionamidine) dihydrochloride as initiator
Synthesis and morphology of Fe3O4/polystyrene/poly(isopropylacrylamide‐co‐methyl acrylate acid) magnetic composite latex – 2,2′‐azobis (2‐methylpropionamidine) dihydrochloride as initiator
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DOI：
10.1002/pola.22142
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发表时间：
2007-09
期刊：
影响因子：
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通讯作者：
Chia-Fen Lee;Yu-Hui Chou;W. Chiu
中科院分区：
文献类型：
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作者：
Chia-Fen Lee;Yu-Hui Chou;W. Chiu
本文采用两级乳液聚合的方法合成了铁氧水/聚苯乙烯/聚（n -异丙基丙烯酰胺-共甲基丙烯酸）（铁氧水/PS/P(NIPAAM-co-MAA)）磁性复合乳液。在该反应体系中，以2,2′-偶氮双（2-甲基丙脒）二盐酸盐（AIBA）为引发剂，引发了第一阶段反应和第二阶段反应。采用传统的共沉淀法制备了fe3o4颗粒。用聚丙烯酸低聚物或月桂酸对fe3o4颗粒进行表面处理，形成稳定的铁磁流体。合成磁性复合乳胶的第一步是在铁磁流体存在下，通过无皂乳液聚合合成PS，形成fe3o4 /PS复合乳胶颗粒。在第一阶段反应之后，以NIPAAM和MAA为单体，Fe 3 O 4 /PS乳胶为种子，采用无皂乳液聚合法进行第二阶段聚合。制备了fe3o4 /PS/P（NIPAAM-co-MAA）磁性复合颗粒。考察了第一阶段反应和第二阶段反应的机理。此外，还研究了PAA和月桂酸对反应动力学、形貌和粒径分布的影响。
In this work, Fe 3 O 4 /polystyrene/poly(N-isopropylacryl amide-co-methylacrylate acid) (Fe 3 O 4 /PS/P(NIPAAM-co-MAA)) magnetic composite latex was synthesized by the method of two stage emulsion polymerization. In this reaction system, 2,2'-azobis(2-methyl propionamidine) dihydrochloride (AIBA) was used as initiator to initiate the first stage reaction and second stage reaction. The Fe 3 O 4 particles were prepared by a traditional coprecipitation method. Fe 3 O 4 particles were surface treated by either PAA oligomer or lauric acid to form the stable ferrofluid. The first stage for the synthesis of magnetic composite latex was to synthesize PS in the presence of ferrofluid by soapless emulsion polymerization to form the Fe 3 O 4 /PS composite latex particles. Following the first stage of reaction, the second stage of polymerization was carried out by the method of soapless emulsion polymerization with NIPAAM and MAA as monomers and Fe 3 O 4 /PS latex as seeds. The magnetic composite particles, Fe 3 O 4 /PS/P(NIPAAM-co-MAA), were thus obtained. The mechanism of the first stage reaction and second stage reaction were investigated. Moreover, the effects of PAA and lauric acid on the reaction kinetics, morphology, and particle size distribution were studied.