Synthesis and Characterization of Thermosensitive Magnetic Latex Particle

• Main Authors: Yu-Hui Chou, 周玉蕙
• Other Authors: 邱文英
• Format: Others
• Language: zh-TW
• Published: 2004
• Online Access: http://ndltd.ncl.edu.tw/handle/95486201515338424490

碩士 === 國立臺灣大學 === 化學工程學研究所 === 92 === In this work, thermosensitive magnetic polymer latex was synthesized by the method of two-step soapless seeded emulsion polymerization. Prior to polymerization, a stable ferrofluid with Fe3O4 nanoparticles was prepared by a traditional co-precipitation method in the presence of PAA oligomer or Lauric acid. In the first step of seeded emulsion polymerization, the ferrofluid acted as seeds, styrene monomer was added into the ferrofluid and then initiator was added to start the polymerization. The magnetic polymer latex particles with the shell of PS were synthesized. Following the first step of reaction, the second step of polymerization was also carried out by the method of soapless emulsion polymerization with NIPAAM and MAA as thermosensitive and -COOH functional group containing monomers, and KPS or AIBA as initiator. The thermosensitive magnetic latex particles, Fe3O4/PS/poly(NIPAAM- MAA) were thus obtained. The effects of PAA and Lauric acid , the stability of the ferrofluid, the ratio of the monomers and other reaction conditions on the reaction kinetics, the structure, size, and uniformity of the composite latex particles were studied together with the experiment observation.