1. Novel co-polymers of vinyl acetate and halogen ring-substituted methyl 2-cyano-3-phenyl-2-propenoates.
- Author
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Kharas, Gregory B., Barbarawi, Hadeal A., Crawford, Allison L., Dotson-Newman, Ogonnaya I., Dukarevich, Igor J., Ekram, Adnan, Galzin, Nicholas A., Ghattas, Rasha M., Hoang, Joseph M., Hyland, Lesley A., Isic, Bedrija, Gutierrez, Jorge, and Watson, Kenneth
- Subjects
COPOLYMERS ,VINYL acetate ,ETHYLENE ,HALOGENS ,GLASS transition temperature - Abstract
Equimolar alternating co-polymers of vinyl acetate and electrophilic trisubstituted ethylene monomers, halogen ring-substituted methyl (E)-2-cyano-3-phenyl-2-propenoates, RC
6 H4 CH=C(CN)CO2 CH3 (where R = 2-Br, 3-Br, 4-Br, 2-Cl, 3-Cl, 4-Cl, 2-F, 3-F, 4-F), were prepared via co-polymerization in solution with radical initiation (ABCN) at 70°C. The compositions of the co-polymers were calculated from nitrogen analysis and the structures were analyzed by IR,1 H- and13 C-NMR. High glass transition temperatures of the co-polymers in comparison with that of polyvinyl acetate indicate a decrease in chain mobility of the co-polymers due to the high dipolar character of the tri-substituted ethylene monomer unit. The gravimetric analysis indicated that the decomposition of the co-polymers occurs in two steps. The first step is relatively fast weight loss in 227–370°C range, followed by very slow decomposition of the formed residue in 370–950°C range. [ABSTRACT FROM AUTHOR]- Published
- 2005
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