Rapid Crack Propagation Failures in HDPE Pipes; Structure-Property Investigations [PE]


Material Science RCP # 2006 Washington DC

The influence of molecular architecture on the rapid crack propagation (RCP) resistance of a wide variety of high-density polyethylene (HDPE) pipes was investigated. It was concluded that high molecular weight, high crystallinity and a relatively narrow molecular weight distribution are important architectural attributes for RCP resistance. The ductile-brittle transition temperature, as measured on compression-molded specimens using the razor-notched Charpy impact test, appears to be a reasonably good indicator of the RCP resistance of the resultant pipes. Finally, the uniformity of carbon black dispersion was also found to influence the RCP performance of the pipe.

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