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Controlled radical alternating copolymerization of N ‐phenyl maleimide with ethyl α‐ethylacrylate by reversible addition fragmentation chain‐transfer process
Author(s) -
Wei Jia,
Zhu Zhonglian,
Huang Junlian
Publication year - 2004
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/app.21154
Subject(s) - comonomer , copolymer , maleimide , polymer chemistry , chain transfer , monomer , polymerization , molar mass distribution , polymer , reactivity (psychology) , chemistry , radical polymerization , branching (polymer chemistry) , materials science , organic chemistry , medicine , alternative medicine , pathology
The alternating copolymerization of N ‐phenyl maleimide (NPMI) with ethyl α‐ethylacrylate (EEA) by the reversible addition fragmentation chain‐transfer process was investigated. The monomer reactivity ratios were measured and r 1 = 0.19 ± 0.03 for NPMI and r 2 = 0.20 ± 0.04 for EEA. It was found that before about 45% of the comonomer conversion, the molecular weight of the copolymer increased with the conversion, the molecular weight distribution was rather narrow, and the molecular weight of the copolymer approached a constant value, irrespective of the length of the polymerization time. Electronic spin resonance determined that the radical signal disappeared quickly after the conversion of comonomer exceeded 45%, which may be attributed to the coupling termination of the propagating polymer chains with the EEA end with the intermediate radicals when the concentration of comonomers decreased. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 94: 2376–2382, 2004