A new criterion of polymer-polymer miscibility is proposed based on th
e equation of Krigbaum and Wall. The parameter Delta b is used to pred
ict polymer-polymer miscibility of PS/PBu, PBu/PMMA, PS/PMMA blends an
d some polyblends cited in the literature. It is found the new criteri
on is reasonable and polymer-polymer miscibility can be determined by
viscosity. (C) 1997 Elsevier Science Ltd.