Tacticity control in the radical polymerization of 2,2,2-trifluoroethyl methacrylate with fluoroalcohol |
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Authors: | Weihong Liu Yinzhong Guo Yoshi Okamoto |
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Institution: | a Polymer Research Institute, Polytechnic University, Six Metrotech Center, Brooklyn, NY 11201 USA b Faculty of Science and Technology, Keio University, Yokohama 223-8522, Japan c ERATO, Koike Photonics Polymer Project, K2 Town Campus, 144-8 Ogura, Saiwai-ku, Kawasaki 212-0054, Japan |
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Abstract: | The free-radical polymerization of 2,2,2-trifluoroethyl methacrylate (TEMA) was carried out in fluoroalcohols to achieve stereoregulation. The polymerization reactivity at low temperature and syndiotactic specificity were enhanced by the use of fluoroalcohol as a solvent. The polymer having triad syndiotacticity (rr) of 70% was obtained in perfluoro-t-butyl alcohol. It was noted that the stereochemistry was nearly independent of reaction temperature. The stereoeffect of fluoroalcohols seemed to be due to the hydrogen-bonding interaction between the alcohol and the monomer or growing species. The hydrogen-bonding formation was determined by FTIR. The copolymerization of TEMA with methyl methacrylate (MMA) in hexafluoroisopropanol afforded a copolymer with syndiotactic specificity. By this method, a cladding material for an optical fiber based on poly(methyl methacrylate) (PMMA) with high mechanical strength and low refractive index could be obtained. |
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Keywords: | Tacticity Radical polymerization Fluoroalcohol 2 2 2-Trifluoroethyl methacrylate Copolymerization Optical fiber |
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