Novel Co-polymers of Vinyl Acetate and Ring-tri-substituted 2-Phenyl-1,1-dicyanoethylenes

Abstract

Electrophilic tri-substituted ethylene monomers, ring-tri-substituted 2-phenyl-1,1-dicyanoethylenes, RC 6 H 2 CH=C(CN) 2 (where R is 2,4,6-trimethyl, 2,3-dimethyl-4-methoxy, 2,4-dimethoxy-3-methyl, 2,3,4-trimethoxy, 2,4,5-trimethoxy, 2,4,6-trimethoxy and 3,4,5-trimethoxy), were synthesized by piperidinecatalyzed Knoevenagel condensation of ring-substituted benzaldehydes and malononitrile, and characterized by CHN elemental analysis, IR, 1 H-and 13 C-NMR. Novel co-polymers of the ethylenes and vinyl acetate were prepared at equimolar monomer feed composition by solution co-polymerization in the presence of a radical initiator (ABCN) at 70 • C. The composition of the co-polymers was calculated from nitrogen analysis, and the structures and properties were analyzed by IR, 1 H-and 13 C-NMR, GPC, DSC and TGA. The high T g of the co-polymers, in comparison with that of polyvinyl acetate, indicates a substantial decrease in chain mobility of the co-polymer due to the high dipolar character of the tri-substituted ethylene monomer unit. Thermogravimetric analysis indicated that the co-polymers decompose in the 190-700 • C range. © Koninklijke Brill NV, Leiden, 2009

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

“…The crystalline product of the reaction was isolated by filtration and purified by crystallization from 2-propanol. The details of the synthesis and characterization of 2,4-(CH 3 3 , and 3,4,5-(CH 3 O) 3 substituted 2-phenyl-1,1-dicyanoethylenes were previously reported (14). 6-Br-3,4-(CH 3 O) 2 , 2,6-(CH 3 O) 2 and 3,5-(CH 3 O) 2 phenyl substituted 1,1-dicyanoethylenes were prepared and characterized.…”