Intermacromolecular complexation because of specific interactions 11. Ionic interaction complexation and its comparison with hydrogen-bonding complexation

The ionic interaction complexation between metal carboxylated polystyrene i onomers and poly(butyl methacrylate-co-vinyl pyridine) (BVP) in both soluti on and bulk was studied by viscometry, laser light scattering (LLS) and dif ferential scanning calorimetry (DSC) and compared with that between BVP and carboxylated polystyrene (CPS), in which the interacting groups are in aci d form. The results show that both kinds of complexation strongly depend on the level of the specific interaction and give rise to an increased hydrod ynamic radius over the component polymer coils. However, the ionic interact ion complexation generally results in an increased viscosity in the solutio n and almost always exhibits two glass transition temperatures (T(g)s), in contrast, the hydrogen bonding complexation leads to a decreased viscosity and only one T-g. The different behavior is attributed to the difference in spatial distributions of the interacting sites in the complexes. (C) 2000 Elsevier Science Ltd. All rights reserved.