AbstractA variety of blends of ABA poly(styrene–b–isoprene) copolymers with poly(2,6‐dimethylphenylene oxide) were prepared. Their compatibility was examined by measuring both the apparent modulus of rigidity and the loss tangent. Several blends showed a unique glass transition temperature between those of the individual components, which indicated compatibility. It was found that only those copolymers which phase separate are compatible with poly(2,6‐dimethylphenylene
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