The phase behaviours in binary blends of styrene-isoprene diblock copo
lymer and poly(vinyl methyl ether) (PVME) were investigated by using s
mall-angle X-ray and light scattering techniques. It was observed that
the added homopolymer molecules were dissolved into the microdomains
of the styrene blocks of the copolymer. The blends exhibited a lower c
ritical solution temperature as seen in the blends of PVME with polyst
yrene. The experimental results were compared with that of the modifie
d Meier's theory in a semiquantitative way. (C) 1997 Elsevier Science
Ltd.