Copolymerization of Diethyl Vinyl Phosphate with Vinyl Acetate and Acrylonitrile |
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| Authors: | Jung-Il Jin Hoe-Sup Byun Soo-Min Lee |
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| Institution: | 1. Department of Chemistry , Korea University , Seoul, 132, Korea;2. Visiting Scientist, Department of Chemical Engineering, Polymer Science and Engineering Program , University of Massachusetts , Amherst, Massachusetts, 01003;3. Department of Chemistry , Korea University , Seoul, 132, Korea;4. Department of Chemistry , Soong Jun University , Taejon, 300, Korea |
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| Abstract: | Free radical-initiated copolymerization of diethyl vinyl phosphate (DEVPA) with vinyl acetate (VAc) and acrylonitrile (AN) was studied. The monomer reactivity ratios for the monomer pairs, determined at 60°C using benzoyl peroxide as an initiator, are: r1(VAc) = 0.95, r2(DEVPA) = 0.93; r1(AN) = 6.6, r2(DEVPA) = 0.049. The values of the Alfrey-Price constants, Q and e, for DEVPA were calculated to be 0.025 and 0.13, respectively, from the VAc system, and 0.026 and 0.14, respectively, from the AN/DEVPA pair. These results indicate that the general reactivity of DEVPA is almost the same as that of VAc and that the diethylphosphate group is a stronger electron-attracting group than the acetoxy group. The intrinsic viscosity and number-average molecular weight of copolymers decreased as their content of DEVPA units increased, indicating a high degree of chain transfer caused by DEVPA. |
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