Abstract
Multiple craze formation is well-known to be an essential part of the toughening mechanism induced by appropriate incorporation of rubber particles into glassy matrices. Details of the craze structure of stress-whitened high impact polystyrene (HIPS) have been examined using transmission and scanning electron microscopy. In addition to the usual OsO 4 straining procedure for TEM, examination by SEM of surfaces created by fracturing at liquid nitrogen temperatures of previously crazed specimens proved useful. The results are discussed in the context of previous observations on craze structure and the relationship to formation of useful materials.
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