Synthesis of poly(vinyl pivalate) by atom transfer radical polymerization in supercritical carbon dioxide

Title
Synthesis of poly(vinyl pivalate) by atom transfer radical polymerization in supercritical carbon dioxide
Author(s)
심재진나오샤드이슬람할도리유바라즈웬방호아
Keywords
METHYL-METHACRYLATE; VINYL PIVALATE; HIGH-PRESSURE; DISPERSION POLYMERIZATION; EMULSION POLYMERIZATION; ATRP; SAPONIFICATION; TEMPERATURE; ACETATE; SYNDIOTACTICITY
Issue Date
201412
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Citation
EUROPEAN POLYMER JOURNAL, v.61, pp.93 - 104
Abstract
Atom transfer radical polymerization of vinyl pivalate was carried out in supercritical carbon dioxide using CuBr or CuCl/terpyridine (tpy) complex system and ethyl 2-bromoisobutyrate as an initiator. The reaction kinetics of the two different catalytic systems (CuBr/tpy and CuCl/tpy) was investigated. In addition, the effects of temperature, pressure, and catalyst/ligand concentration were examined systematically to obtain an acceptable rate of polymerization and control over the number-average molecular weight (MO and polydispersity index (PDI). The result showed that relatively low PDIs were obtained and polymerization rates were enhanced at higher pressures. The CuCl/tpy complex exhibited the maximum conversion of 90% with a M., and PDI of 60.2 kg/mol and 1.29, respectively. The CuCl/tpy catalyst system showed better agreement between theoretical and experimental M-n compared to the CuBr/tpy. The living character of poly(vinyl pivalate) (PVPi) was proven by H-1 NMR spectrum and chain extension reaction. The formation of poly(vinyl alcohol) via saponification of the resulting PVPi was also carried out. The structures of both PVPi and PVA were examined by H-1 NMR and FTIR spectra. (C) 2014 Elsevier Ltd. All rights reserved.
URI
http://hdl.handle.net/YU.REPOSITORY/30377http://dx.doi.org/10.1016/j.eurpolymj.2014.09.003
ISSN
0014-3057
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공과대학 > 화학공학부 > Articles
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