Plane stress fracture toughness of physically aged plasticized PETG as assessed by the essential work of fracture (EWF) method

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Abstract

The plane stress fracture toughness of amorphous copolyester (PETG) sheets plasticized by various amount of neopentylglycol dibenzoate (NPGDB in 0, 5, 10 and 20 wt%) was studied in as-received (AR) and rejuvenated (RJ) states by adopting the essential work of fracture (EWF) method. EWF tests were performed on deeply double-edge notched tensile loaded (DDEN-T) specimens at various deformation rates (2,10 and 100 mm/min) at room temperature. It was established that physical aging strongly affected the EWF terms. The specific yielding-related EWF increased with increasing deformation rate and decreased with increasing plasticizer content. The specific non-essential work and its necking-related constituent, which changed parallel to each other, remained constant up to 10 wt% NPGDB content and decreased afterwards. The plastic zone in the DDEN-T specimens was formed by cold drawing which is governed by the entanglement structure. This This was demonstrated by the shape recovery of the plastic zone in the broken DDEN-T specimens after heating them above the T g of the related PETG compound.

Original languageEnglish
Pages (from-to)5691-5699
Number of pages9
JournalPolymer
Volume44
Issue number19
DOIs
Publication statusPublished - Aug 21 2003

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Keywords

  • Amorphous copolyester
  • Essential work of fracture (EWF)
  • Plasticizer

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry

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