Copolymerization of ethyl methacrylate with N-(3- or 4-halogenphenyl)maleimides: The monomer reactivity ratios
✍ Scribed by Anna Ryttel
- Publisher
- John Wiley and Sons
- Year
- 1999
- Tongue
- English
- Weight
- 135 KB
- Volume
- 74
- Category
- Article
- ISSN
- 0021-8995
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✦ Synopsis
The copolymerization of ethyl methacrylate [I] with N-(3-chlorophenyl)maleimide [II], N-(4-chlorophenyl)maleimide [III], N-(3-bromophenyl)maleimide [IV], and N-(4-bromophenyl)maleimide [V] was carried out in benzene, using ␣,␣Ј-azobisisobutyronitryle as an initiator at 60°C. The copolymer compositions were estimated by elemental analysis. The monomer reactivity ratios of [I] (r 1 ) with [II], [III], [IV], and [V]
(r 2 ) were determined by the Fineman-Ross and Kelen-Tu ¨do ¨s methods, and recalculated using the nonlinear minimization algorithm based on Mayo-Lewis's method (RREVM). The Alfrey-Price copolymerization parameters Q and e for N-(3-or 4-halogenphenyl)maleimides were also calculated. The kind of halogen atom (Br-or Cl-) and its position in the phenyl ring of maleimide on the values of reactivity ratios r 1 and r 2 are discussed.