Tsuneyuki Sato, Keiko Takahashi, Hitoshi Tanaka
Apr 1, 1991
Citations
0
Influential Citations
19
Citations
Journal
Macromolecules
Abstract
The copolymerization of N-cyclohexylmaleimide (CHMIm) (M 1 ) and di-n-butylitaconate (DBI) (M 2 ) was investigated in benzene. Monomer reactivity ratios of r 1 =0.21±0.04 and r 2 =0.34±0.04 were obtained according to the Kelen-Tudos method. The copolymerization system was found to insolve ESR-observable propagating polymer radicals, the ESR spectrum of which is inexplicable in terms of any overlapping of the spectra of poly(CHMIm) and poly(DBI) radicals observed in the corresponding homopolymerization systems. This indicates that some penultimate monomer unit causes a change in the ESR spectrum, that is, the structure of the propagating radical center. The apparent rate constants of propagation and termination were estimated