Morphology and fatigue crack propagation in crystalline polymers

J. Runt, M. Jacq, J. T. Yeh, K. P. Gallagher

Research output: Contribution to journalConference article

Abstract

An investigation was conducted of the influence of semi-crystalline morphology on fatigue crack propagation (FCP) in two crystalline polymers, polyethylene (PE) and poly(butyleneterephthalate) (PBT). For polyethylene it is shown that the degree of crystallinity increases and apparently accounts for the improvement in fatigue resistance. Considering the quenched sample, one realizes that it exhibits a higher resistance toward fatigue crack propagation than most of the annealed ones, although it has a lower degree of crystallinity. For poly(butyleneterephthalate) annealed samples were found to be too weak to obtain any stable crack growth eg. when annealing time is more than 4 hours at 170°C or more than an hour at 200°C. It quickly became clear that the changes in FCP behavior mirror the changes in molecular weight and calculated tie molecule density.

Original languageEnglish (US)
Pages (from-to)134-135
Number of pages2
JournalAmerican Chemical Society, Polymer Preprints, Division of Polymer Chemistry
Volume29
Issue number2
StatePublished - Sep 1 1988
EventPolymer Preprints - American Chemical Society - Los Angeles, CA, USA
Duration: Sep 25 1988Sep 30 1988

All Science Journal Classification (ASJC) codes

  • Polymers and Plastics

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