Copolymer of acrylonitrile (AN) with vinyl propionate (VP) was synthesized by free radical polymerization using 1, 1' azo bis-cyclohexanecarbonitrile (VAZO) as initiator in dimethyl formamide (DMF) at 60±1 0C. The monomer reactivity ratio was computed by both Fineman-Ross (F-R) and Kelen-Tudos (K-T) methods. The reactivity ratio values suggest the
formation of random copolymers which has been supported by the azeotropic composition evaluation. The mean sequence length ( n 1 ) and probabilities (p) in the formation of various structural units were evaluated. The molecular weights of the polymers were determined by gel permeation chromatography, which increase with the increase of the AN content. The solubility parameters were determined with the viscometric method. The glass transition temperature (Tg) of the copolymers were determined by differential scanning calorimetry (DSC). Thermogravimetric analysis (TGA) of the copolymer was also studied. The di-electrical property of the copolymer is also studied.
Cite this article:
K Rajani Kumar, SK Feroz, P Raghunath Rao. Reactivity ratios, thermal and di-electrical properties of 1, 11 azobis (cyclohexanecarbonitrile) initiated nitrile copolymer. Asian J. Research Chem. 1(2): Oct.-Dec. 2008; Page 58-63.