1. Novel Copolymers of Styrene and Alkoxy Ring-Disubstituted 2-Phenyl-1,1-dicyanoethylenes.
- Author
-
Kharas, GregoryB., Russell, SelenaM., Baird, Hope, Cipolla, Gerald, Farina, Peter, Fletcher, Vikie, Goizman, Michel, and Watson, Kenneth
- Subjects
ETHYLENE ,COPOLYMERS ,MONOMERS ,POLYMERIZATION ,STYRENE ,CONDENSATION - Abstract
Electrophilic trisubstituted ethylene monomers, ring-disubstituted 2-phenyl-1,1-dicyanoethylenes, RC6H3CH=C(CN)2 (where R is 2,3-dimethoxy, 2,4-dimethoxy, 2,5-dimethoxy, 3,4-dimethoxy, 3-ethyl-4-methoxy), were synthesized by piperidine catalyzed Knoevenagel condensation of ring-disubstituted benzaldehydes and malononitrile, and characterized by CHN elemental analysis, IR, 1H- and 13C-NMR. Novel copolymers of the ethylenes and styrene were prepared at equimolar monomer feed composition by solution copolymerization in the presence of a radical initiator (AIBN) 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 290-450°C range. [ABSTRACT FROM AUTHOR]
- Published
- 2008
- Full Text
- View/download PDF