LOW TEMPERATURE IMPACT MODIFIER FOR CLEAR POLYPROPYLENE APPLICATIONS

摘要

A styrene-ethylene/butylene-styrene (SEBS) block copolymer with enhanced rubber segment is used to modify homo polypropylene and random co-polypropylene. The impact property of blends is analyzed based on the instrumented impact test, and the optical property is measured by haze and transmission tests. The results show that both impact strength and optical properties of blends are improved even with low addition of the unique SEBS. Another novel SEBS is also used to further improve the low temperature impact strength of random co-polypropylene without sacrificing the clarity. The findings can be applied in many packaging applications where both clarity and impact strength are desired. The mechanical, rheological and thermal properties of blends are investigated by flexural test, capillary rheometer and DSC respectively. Those results provide important guidance for optimizing the formulation.