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

Abstract

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-(C 6 H 5 CH 2 O) 2 (31.0) > 2-). 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 270-400 • C range with residue, which then decomposition in 400-800 • C range.

Novel Copolymers of Styrene and Some Ring-substituted 2-Phenyl-1,1-dicyanoethylenes

“…Other functional group bands are 1760 cm −1 (C=O, stretching) for 4-CH 3 CO 2 ; 3365 (N-H, stretching), 1600 (C=O, stretching), 1554 (C-N in plane bending) for 4-CH 3 CONH. These bands were found also in copolymers of 2-phenyl-1,1-dicyanoethylene with vinyl acetate (15)(16)(17) and 4-fluorostyrene (18,19). 1 H-NMR spectra of the ST-TSE copolymers show a broad double peak in a 5.8-7.5 ppm region corresponding to phenyl ring protons.…”