Copolymerization of N-Vinylurea and Vinyl Acetate (Ⅱ). Solvent Effects in Radical Copolymerization

N-비닐尿素와 醋酸비닐의 混成重合 (第2報). 라디칼混成重合에서의 溶媒效果

  • Woo Sik Kim (Department of Polymer Science, Kyungpook National University) ;
  • Hak-ki Lee (Department of Polymer Science, Kyungpook National University)
  • 김우식 (경북대학교 공과대학 고분자공학과) ;
  • 이학기 (경북대학교 공과대학 공업화학과)
  • Published : 19800230

Abstract

The free radical copolymeriaztion of N-vinylurea(VU) with vinyl acetate (VAc) was carried out at $60^{\circ}C$ in three solvents. VU-vinyl alcohol(VA) copolymers were prepared by the methanolysis of the VU-VAc copolymers. From the nitrogen content measurements of VU-VA copolymers, the monomer reactivity ratios for the VU-VAc copolymerization and the values of Alfrey-Price's Q and e for VU were determined. These Q and $\varrho$ values obtained in the cases of using methanol and methanol-dioxane as the polymerization solvents are comparable with those found for other monomers which have > NCO-pendent groups. The $\varrho$ value indicates that the urea group of VU is a electron-donating group. The copolymerization parameter of VU shows a strong effect of the solvents. These results are interpreted to be that VU is in equilibrium with its tautomer at the polymerization temperature.

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