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Radical copolymerization between methyl methacrylate and N ‐cyclohexylmaleimide with thiol as an inifer
Author(s) -
Jiang Xulin,
Yan Deyue,
Zhu Xinyuan,
Lin Jin,
Xia Ping
Publication year - 1999
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/(sici)1097-4628(19991107)74:6<1417::aid-app14>3.0.co;2-5
Subject(s) - comonomer , copolymer , polymer chemistry , methyl methacrylate , reactivity (psychology) , monomer , activation energy , glass transition , chemistry , methacrylate , materials science , polymer , organic chemistry , medicine , alternative medicine , pathology
N ‐dodecanethiol (RSH) was found efficient to initiate the radical copolymerization of methyl methacrylate (MMA) with N ‐cyclohexylmaleimide (NCMI) at 40–60°C. The initial copolymerization rate, R p , increases respectively with increasing [RSH] and the mol fraction of NCMI in the comonomer feed, f NCMI. The molecular weight of the copolymer decreases with increasing [RSH]. The initiator transfer constant of RSH was determined to be C I = 0.21. The apparent activation energy of the overall copolymerization was measured to be 46.9 kJ/mol. The monomer reactivity ratios were determined to be r NCMI = 0.32 and r MMA = 1.35. The glass transition temperature of the copolymer increases obviously with increasing f NCMI , which indicates that adding NCMI may improve the heat resistance of plexiglass. © 1999 John Wiley & Sons, Inc. J Appl Polym Sci 74: 1417–1423, 1999