Intrinsic crazing and anisotropy of maximum recoverable extension in oriented glassy polycarbonate

✍ Scribed by Nicole Heymans

• Book ID: 105338227
• Publisher: John Wiley and Sons
• Year: 1990
• Tongue: English
• Weight: 631 KB
• Volume: 28
• Category: Article
• ISSN: 0887-6266
• DOI: 10.1002/polb.1990.090280611

✦ Synopsis

Abstract

The critical draw ratio for initiation of intrinsic crazing in polycarbonate below the glass transition temperature has been determined after preorientation in the melt. Even when referred to the isotropic state, this ratio is found to depend not only on the extent of preorientation but also to be distinctly anisotropic. Under the assumption that intrinsic crazing occurs at the maximum extension of the entanglement network, these results are incompatible with a strain dependent but homogeneous breakdown of the entanglement network, but can be interpreted in terms of departure from affine transformation of the radius of gyration of an entangled length.