摘要：

Electrophilic trisubstituted ethylene monomers, alkoxy ringsubstituted 2cyanoN,Ndimethyl3phenyl2propenamides, RC6H4CHC(CN)CON(CH3)2 (where R is 2OCH3, 3OCH3, 4OCH3, 2OCH2CH3, 3OCH2CH3, 4OCH2CH2CH3, 4OCH2CH2CH2CH3), were synthesized by potassium hydroxide catalyzed Knoevenagel condensation of ringsubstituted benzaldehydes and N,Ndimethyl cyanoacetamide, and characterized by CHN elemental analysis, IR, 1H and 13CNMR. Novel copolymers of the ethylenes and styrene were prepared at equimolar monomer feed composition by solution copolymerization in the presence of a radical initiator, ACBN at 70°C. The composition of the copolymers was calculated from nitrogen analysis, and the structures were analyzed by IR, 1H and 13C NMR, GPC, DSC, and TGA. High Tg of the copolymers in comparison with that of polystyrene indicates a substantial decrease in chain mobility of the copolymer due to the high dipolar character of the trisubstituted ethylene monomer unit. The gravimetric analysis indicated that the copolymers decompose in the 300450°C range.

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