Novel Copolymers of 4-Fluorostyrene. 1. Alkyl Ring-Substituted 2-Phenyl-1,1-dicyanoethylenes

Abstract

Novel copolymers of trisubstituted ethylene monomers, alkyl ring-substituted 2-phenyl-1,1-dicyanoethylenes, RC 6 H 4 CH=C(CN) 2 (where R is 2-methyl, 3-methyl, 4-methyl, 4-ethyl, 4-i -propyl, 4-butyl, 4-i -butyl, and 4-t-butyl) and 4-fluorostyrene were prepared at equimolar monomer feed composition by solution copolymerization in the presence of a radical initiator (ABCN) at 70 • C. The composition of the copolymers was calculated from nitrogen analysis, and the structures were analyzed by IR, 1 H and 13 C-NMR. The order of relative reactivity (1/r 1 ) for the monomers is 4-ethyl (42.6) > 4-butyl (29.4) > 4-t-butyl (26.7) > 4-i -butyl (1.6) > 4-i -propyl (1.29) > 3-methyl (1.26) > 2-methyl (0.8) > 4-methyl (0.4). High T g of the copolymers, in comparison with that of poly(4-fluorostyrene) indicates a substantial decrease in chain mobility of the copolymer due to the high dipolar character of the trisubstituted ethylene monomer unit. Decomposition of the copolymers in nitrogen occurred in two steps, first in 183-500 • C range with residue (5-30% wt.), which then decomposed in the 500-800 • C range.

Novel Copolymers of 4-Fluorostyrene. 10. Some Ring-substituted 2-Phenyl-1,1-dicyanoethylenes

“…Recently, we have described synthesis and characterization of copolymers of ring-unsubstituted 2-phenyl-1,1-dicyanoethylene with 4-fluoro-and pentafluorostyrene (12), and alkyl ring-substituted (13). In continuation of our studies of the monomer structure-reactivity correlation in the radical copolymerization of electrophilic trisubstituted ethylene monomers, we have prepared copolymers of 4-fluorostyrene (4FST) with some ring-substituted 2-pheny-1,1-dicyanoethylenes, RC 6 …”

Novel Copolymers of 4-Fluorostyrene. 8. Some Ring-Trisubstituted 2-Phenyl-1,1-dicyanoethylenes

“…Recently, we have described synthesis and characterization of copolymers of ring-unsubstituted 2-phenyl-1,1-dicyanoethylene with 4-fluoro-and pentafluorostyrene (12), and alkyl ring-substituted (13). In continuation of our studies of the monomer structure-reactivity correlation in the radical copolymerization of electrophilic trisubstituted ethylene monomers, we have prepared copolymers of 4-fluorostyrene (4FST) with ring-substituted 2-phenyl-1,1-dicyanoethylenes, RC 6 2 ), 2,3,5-Cl 3 , 2,3,6-Cl 3 ).…”

Novel Copolymers of 4-Fluorostyrene. 6. Dialkoxy Ring-Substituted 2-Phenyl-1,1-dicyanoethylenes

“…Recently we have described synthesis and characterization of copolymers of ring-unsubstituted 2-phenyl-1,1-dicyanoethylene with 4-fluoro-and pentafluorostyrene (12), and alkyl ring-substituted (13). In continuation of our studies of the monomer structure-reactivity correlation in the radical copolymerization of electrophilic trisubstituted ethylene monomers, we have prepared copolymers of 4-fluorostyrene (4FST) with dialkoxy ring-substituted 2-phenyl-1,1-dicyanoethylenes, RC 6 Kharas et al…”