Melt blends of SAN with SAN‐graft‐polybutadiene (PB)

Melt blends of SAN with SAN‐graft‐polybutadiene (PB) (g‐ABS) were prepared in a Brabender plasticorder. The effect of g‐ABS on the morphology and mechanical and viscoelastic properties of the blends was studied up to 60 wt % g‐ABS. The brittle‐tough (BT) transition occurred around 20 wt % g‐ABS, and the viscosity increased monotonically with g‐ABS, showing yield behavior at ≥ 20%. The lower and higher glass transition temperatures (Tg) of g‐ABS, each corresponding to the Tg of PB and grafted SAN, decreased and increased with the addition of free SAN, and this was interpreted in terms of graft SAN—PB phase separation.