Deformation mechanism in polypropylene-based thermoplastic-vulcanizate

摘要

Polypropylene(PP)-based thermoplastic-vulcanizate (TPV) has phase-separated morphology and consist relatively high volume fraction of elastomeric domains in a continuous brittle thermoplastic matrix. Isolated elastomeric domains in PP matrix are connected by undeformed PP regions, after equatorial PP regions neighboring elongated elastomeric domains were fractured at low deformation. These connected elastomeric domains highly deformed at high deformation and cause elasticity of TPV. Fragmented crystalline structure of PP adjacent to elongated elastomeric domains contributes stress level of TPV at high deformation.