The application of fracture mechanics to the impact behaviour of rubber‐toughened polyamides

摘要: Rubber-modification of polyamide is a widely-applied method improving material resistance under high strain rate loading. The processing conditions used for preparing such two-phase blends strongly influence their structure and thus subsequent impact properties. In the present work relationships between production parameters, phase have been studied, rǒle rubber in promoting energy absorption investigated. It has found that improved resistance, defined as combination to crack initiation propagation, achieved by decreasing viscosity while increasing extrusion injection temperatures, mixing shear volume fraction; an EPR modifier offers superior performance polybutadiene modifier; dominant mechanisms energy-absorption are shearing void formation, there being no clear evidence crazing; J-integral technique plastic fracture mechanics can be applied Charpy testing; TEM allied with image analysis techniques provides quantitative morphological information on polymer blends.