Abstract
Structural and morphological parameters, together with processing conditions, determine the type of fracture behavior of polyethylene (PE). Long-time brittle failure, which occurs under low stresses and at room temperature, limits the lifetime of polyethylene pipes, which are used for water and gas distribution. To optimize the lifetime of such pipes, it is necessary to apply methods for comprehensive understanding of their structure and fracture properties. For the observation of the failure process, accelerated PENT (Pennsylvania notch test) and FNCT (full notch creep test) tests were used. The structural parameters were characterized by SIS/DSC (stepwise isothermal segregation/differential scanning calorimetry) and “rapid” SIS/DSC methods. The correlation between fracture and structural parameters was found.
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