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Abstract
Izod impact strength of PP impact copolymer/Styrene-Butadiene-Styrene blends were evaluated at varied sub-zero temperatures and demonstrated 12 times enhancement in impact strength of 40% SBS containing blend over pure PP-cp at −40°C. SBS content played a vital role in morphology development as it changes from droplet morphology to elongated ellipsoid to a seemingly networked structure leading towards different fracture mechanisms. Rheological properties of blends evaluated on capillary rheometer showed pseudoplastic behavior at varied shear rates (50 − 104 s−1) at 220°C and good agreement between experimental shear viscosity and theoretical values as per log additivity principle at high shear rates.
ACKNOWLEDGMENT
The authors are grateful to Dr. K.U. Bhasker Rao, Director DMSRDE for providing all necessary support and guidance to carry out this work. The authors also acknowledge the support rendered by Ms. Kavita Agarwal and Dr. Mahender Prasad for LVSEM analysis. Finally the authors thank all the members of Polymer Processing Group for their constant support.