Influence of grafting on the thermodynamic parameters and stability constants of some intermacromolecular complexes of poly(methacrylic acid) and a graft copolymer

Abstract

Stability constants and thermodynamic parameters (e. g. AH " and AS ") have been determined for intermacromolecular complexes of poly(methacry1ic acid) and poly-(acrylamide) (PAm)/poly(vinyl alcohol) (PVA) graft copolymer. These values have been compared with those obtained for the intermacromolecular complexes of corresponding homopolymers (e. g. PAm and PVA). Influence of grafting on these parameters has been explained on the basis of more favourable cooperative binding with the graft copolymer. ZUSAMMENFASSUNG:Filr die intermolekularen Komplexe aus Poly(methacry1sBure) und Poly(viny1alkohol-g-acrylamid) wurden die Stabilitiitskonstanten und thermodynamischen Parameter (AH" und ASo) bestimmt. Diese Werte wurden mit denen verglichen, die man vorher filr die intermolekularen Komplexe der entsprechenden Homopolymeren, Poly(acry1amid) und Poly(vinylalcohol), bestimmt hatte. Der Einflul3 des Pfrop fens auf diese Parameter wurde erklart mit den gilnstigeren kooperativen Bindungen mit dem Pfropfcopolymeren. 0 1987 HUthig& Wepf Verlag, Basel

Interpolymer complexes of a graft copolymer with polyelectrolytes and equivalent blends of binary homopolymer complexes: A comparative study of their stability and thermodynamic parameters

“…The minima in the reduced viscosity curve at specific stoichiometries could be attributed to the formation of compact coil as a result of complex formation. We thought that this rather interesting observation regarding the interaction of units of the graft copolymer with complementary homopolymers, could be probed further by studying the influence of grafting on interpolymer complex formation 19). Keeping this in mind, we prepared some blends of binary homopolymer complexes and determined their stability constants and related thermodynamic parameters.…”