Plane-stress fracture behavior of syndiotactic polypropylenes of various crystallinity as assessed by the essential work of fracture method

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Abstract

The fracture behavior of 1-mm-thick syndiotactic polypropylene (sPP) sheets of various crystallinity (owing the various stereo- and regioregularity) was studied by the essential work of fracture (EWF) concept. The specific work of fracture parameters were determined on tensile-loaded deeply double-edge notched (DDEN-T) specimens at various deformation rates (v = 1, 10 and 100 mm/min) at ambient temperature. As the DDEN-T specimens showed full ligament yielding prior to subsequent necking, the energy partitioning method was adopted for data reduction. The specific essential work of fracture slightly increased as a function of crystallinity. Its yielding-related constituent increased with both crystallinity and deformation rate similarly to that of the yield strength and E-modulus. The specific plastic work parameters were less sensitive to crystallinity and deformation rate. The strain-induced crystalline phase transition from helical toward all-trans conformation was accompanied by voiding and crazing.

Original languageEnglish
Pages (from-to)1410-1419
Number of pages10
JournalPolymer Engineering and Science
Volume42
Issue number7
DOIs
Publication statusPublished - Jul 1 2002

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ASJC Scopus subject areas

  • Chemistry(all)
  • Polymers and Plastics
  • Materials Chemistry

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