Abstract
Low conversion copolymerization of N-vinyl-2-pyrrolidon M.W = (111.14) VP (monomer-1) has been conducted with acrylic acid AA and methymethacrylate MMA in ethanol at 70ºC , using Benzoyl peroxide BPO as initiator . The copolymer composition has been determined by elemental analysis. The monomer reactivity ratios have been calculated by the Kelen-Tudos and Finman-Ross graphical procedures . The derived reactivity ratios (r1 , r2 ) are : (0.51 , 4.85) for (VP / AA ) systems and (0.34 , 7.58) for (VP , MMA) systems , and found the reactivity ratios of the monomer AA , MMA is mor than the monomer VP in the copolymerization of (VP / AA) and (VP /MMA) systems respectly . The reactivity ratios values were used for microstructures calculation.
Highlights
(N-vinyl-2-pyrrolidon–co- acrylic acid) PVP/AA and poly (N-vinyl-2-pyrrolidon- co- methymethacrylate )PVP/MMA is generally made by free radical polymerization .It prepared successfully in aqueous salt solution using cationic polyelectrolytes as stabilizers[1] . knowledge of copolymer”s composition is an important factor in the evaluation of its utility [2,3,4].The estimation of copolymer composition and determindation of reactivity ratios are significant for tailor-making properties.Copolymerization modulates both the intramolecular and intermolecylar forces exercised between like and unlike polymer segment and properties such as glass transition temperature, melting point, solubility, permeability, adhesion, dyeability and chemical reactivity may be varied withen a wide limits
Knowledge of copolymer”s composition is an important factor in the evaluation of its utility [2,3,4].The estimation of copolymer composition and determindation of reactivity ratios are significant for tailor-making properties
The utility of copolymerization is exemplified on the one hand by the fundamental investigation of structure property relation [5] and on other hand by the wide range of commercial application .The relative reactivity of a monomer toward a certain polymer radical is readily calculated from the monomer reactivity ratios of copolymerization
Summary
(N-vinyl-2-pyrrolidon–co- acrylic acid) PVP/AA and poly (N-vinyl-2-pyrrolidon- co- methymethacrylate )PVP/MMA is generally made by free radical polymerization .It prepared successfully in aqueous salt solution using cationic polyelectrolytes as stabilizers[1] . knowledge of copolymer”s composition is an important factor in the evaluation of its utility [2,3,4].The estimation of copolymer composition and determindation of reactivity ratios are significant for tailor-making properties.Copolymerization modulates both the intramolecular and intermolecylar forces exercised between like and unlike polymer segment and properties such as glass transition temperature, melting point, solubility, permeability, adhesion , dyeability and chemical reactivity may be varied withen a wide limits. The utility of copolymerization is exemplified on the one hand by the fundamental investigation of structure property relation [5] and on other hand by the wide range of commercial application .The relative reactivity of a monomer toward a certain polymer radical is readily calculated from the monomer reactivity ratios of copolymerization.
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