Abstract
Crazes have been produced in polycarbonate by atomizing acetone over uniaxial stressed solvent cast thin films. Transmission electron microscopy shows that two types of craze orientation exist. Crazes are formed perpendicular to the applied stress direction and at approximately 55° to the applied stress direction. The craze structures observed at 55° to the applied stress direction are suggested to result from cavitation of pre-existing deformation bands. The internal morphology of each type of craze is similar, and the fibre diameter, void size and craze width of each type depends on the amount of craze development. The structure of the craze-matrix interface is, however, different for each type of craze. Necking and work-hardening of the fibres occurs at the normal craze-matrix interface, whereas a rough undrawn interface exists for the angular crazes.
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