ABSTRACT
The thermodynamic basis to explain miscibility in polymer blends is an exothermic heat of mixing, since entropic contributions are so small in such systems. One school of thought is that the speci™c intermolecular interactions are responsible for exothermic heats of mixing. Hydrogen bond formation, π-π complex formation, and a variety of speci™c interactions play an important role in determining polymer blend miscibility. On the other hand, the observed exothermic heats of mixing for many low and high molecular weight systems are quite small, indicating that other mechanisms may be involved.
