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Poly(4-vinylphenol- co -methyl methacrylate) (P(VPh-MMA)) and poly( N vinylpyrrolidone-  co -vinyl acetate) (P(VPr-VAc)) form hydrogen bonding complexes with approx. 1:1 stoichiometry between the VPh unit of P(VPh-MMA) and the VPr unit of P(VPr-VAc) in methanol. These complexes show much higher glass transition temperatures than average polymer blends, suggesting the presence of extremely strong hydrogen bonds. FTIR measurements revealed selective hydrogen bonds between the hydroxy group of VPh units in P(VPh-MMA) and the carbonyl group of VPr units in P(VPr-VAc).

Complex formation and selective hydrogen bonding in poly(4-vinylphenol-co-methyl methacrylate)- poly(N-vinylpyrrolidone-co-vinyl acetate) systems