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Kinetics for copolymerization of methyl methacrylate with N ‐cyclohexylmaleimide
Author(s) -
Jiang Xulin,
Tai Hongyun,
Xia Ping,
Yan Deyue
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(19991031)74:5<1293::aid-app27>3.0.co;2-f
Subject(s) - copolymer , polymer chemistry , methyl methacrylate , monomer , kinetics , reactivity (psychology) , activation energy , benzene , glass transition , materials science , chemistry , polymer , organic chemistry , composite material , medicine , physics , alternative medicine , pathology , quantum mechanics
The kinetics for the radical copolymerization of methyl methacrylate (MMA) with N ‐cyclohexylmaleimide (NCMI) was investigated. The initial copolymerization rate R p is proportional to the initiator concentration to the power of 0.54. The apparent activation energy of the overall copolymerization was measured to be 69.0 kJ/mol. The monomer reactivity ratios were determined to be r NCMI = 0.42 and r MMA = 1.63. R p reduces slightly, and the molecular weight of the resultant copolymer decreases with increasing the concentration of the chain transfer agent N ‐dodecanethiol (RSH). The more the transfer agent, the narrower the molecular weight distribution of the resulting copolymer. The following chain‐transfer constant of RSH for the copolymerization of MMA with NCMI in benzene at 50°C was obtained: C s = 0.23. The glass transition temperature ( T g ) of the copolymer increases with increasing f NCMI , which indicates that adding NCMI can improve the heat resistance of Plexiglas. © 1999 John Wiley & Sons, Inc. J Appl Polym Sci 74: 1293–1297, 1999