Abstract
Polypropylene (PP) is being used increasingly as a material for pressure pipes for distribution of hot and cold water. In these applications, the long-term performance and reliability are critical, key properties. The lifetime of PP is influenced by a large number of structural and morphological parameters. The structural changes due to processing conditions were studied by “rapid” SIS/DSC method (stepwise isothermal segregation). The full notch creep test (FNCT) was used to estimate the pipe lifetime. The application of both structural and fracture methods allows to describe these changes. A correlation between time to failure and structural parameters (MFR—melt mass-flow rate, drift molecular parameter τ, and kinetic parameter k) was found.
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