Synthesis and characteristics of poly(N‐isopropylacrylamide‐co‐methacrylic acid)/Fe3O4 thermosensitive magnetic composite hollow latex particles |
| |
Authors: | Chia‐Fen Lee Mei‐Ling Lin Yu‐Cheng Wang Wen‐Yen Chiu |
| |
Affiliation: | 1. Department of Cosmetic Science, Chia Nan University of Pharmacy and Science, Tainan, Taiwan, Republic of China;2. Institute of Polymer Science and Engineering, National Taiwan University, Taipei, Taiwan, Republic of China;3. Department of Material Science and Engineering, National Taiwan University, Taipei, Taiwan, Republic of China;4. Department of Chemical Engineering, National Taiwan University, Taipei, Taiwan, Republic of China |
| |
Abstract: | In this study, the poly(NIPAAm–MAA)/Fe3O4 hollow latex particles were synthesized by three steps. The first step was to synthesize the poly(methyl methacrylate‐co‐methylacrylate acid) (poly(MMA‐MAA)) copolymer latex particles by the method of soapless emulsion polymerization. Following the first step, the second step was to polymerize N‐isopropylacrylamide (NIPAAm), MAA, and crosslinking agent (N,N'‐methylene‐bisacrylamide (MBA)) in the presence of poly(MMA‐MAA) latex particles to form the linear poly(MMA‐MAA)/crosslinking poly (NIPAAm‐MAA) core‐shell latex particles. After the previous processes, the core‐shell latex particles were heated in the presence of NH4OH to dissolve the linear poly(MMA‐MAA) core in order to form the poly(NIPAAm‐MAA) hollow latex particles. In the third step, Fe2+ and Fe3+ ions were introduced to bond with the ? COOH groups of MAA segments in the poly(NIPAAm‐MAA) hollow polymer latex particles. Further by a reaction with NH4OH and then Fe3O4 nanoparticles were generated in situ and the poly(NIPAAm‐MAA)/Fe3O4 magnetic composite hollow latex particles were formed. The concentrations of MAA, crosslinking agent (N,N'‐methylene bisacrylamide), and Fe3O4 nanoparticles were important factors to influence the morphology of hollow latex particles and lower critical solution temperature of poly(NIPAAm–MAA)/Fe3O4 magnetic composite hollow latex particles. © 2012 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2012 |
| |
Keywords: | composites core‐shell polymers emulsion polymerization Fe3O4 hollow latex particle latices LCST soapless emulsion polymerization thermosensitive |
|
|