The tensile stress–strain curves of ST2/PS082
blends measured at room temperature (23 8C) are
presented in Fig. 17. The elongation at break falls
drastically when ST2 is blended with 20 wt% of PS.
The yield strength and Young’s modulus increase
almost linearly with increasing overall polystyrene
content [95]. An abrupt change in elongation at
break for the blend (at 20 wt% PS082) suggests a
transition in deformation mechanism to be discussed
later.