A technique has been developed for studying the inherent fracture properties of polymeric materials containing toughening agents. It was important to achieve good isolation between crack initiation and crack propagation in specimens of material that could be precisely loaded and allowed to stress relax before being fractured. In this study, the fracture resistance of acrylonitrile-butadiene-styrene (ABS) is compared with styrene-acrylonitrile (SAN).
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