Novel Copolymers of 2-Phenyl-1,1-dicyanoethylene with 4-Fluoro- and Pentafluorostyrene

et al. 2011

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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 3,4,5-(CH 3 O) 3 (10.6) > 2,4,6-(CH 3 O) 3 (9.3) > 2,4,5-(CH 3 O) 3 (5.4) > 2,3,4-(CH 3 O) 3 (4.4) > 6-Br-3,4-(CH 3 O) 2 (3.2) > 2,3,5-Cl 3 (1.5) > 2,3,6-Cl 3 (1.0) > 2,4-(CH 3 O) 2 -3-CH 3 (0.7). 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 the 200-400 • C range with residue, which then decomposed in the 400-800 • C range.

Section: Structure and Spectral Propertiesmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

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

et al. 2011

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“…They are amorphous and show no crystalline DSC endotherm. Relatively high T g of the copolymers (Table 1) in comparison with that of poly(4-fluorostyrene) (T g = 108 • C) (15) indicates decrease of chain mobility of the copolymer due to the high dipolar character of the TSE structural units.…”

Section: Structure and Spectral Propertiesmentioning

confidence: 98%

“…Recently we have described synthesis and characterization of copolymers of 2-phenyl-1,1-dicyanoethylene with 4-fluoro-and pentafluorostyrene (15). 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 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).…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2010

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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.

“…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…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2010

Self Cite

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 2,6-(CH 3 O) 2 (2.8) > 2,5-(CH 3 O) 2 (2.5) > 2,3-(CH 3 O) 2 (2.1) > 3,5-(CH 3 O) 2 (1.8) > 3,4-(CH 3 O) 2 (0.9) > 2,4-(CH 3 O) 2 (0.7). 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 the 250-400 • C range with residue, which then decomposition in 400-800 • C range.