Effects of cold drawing and annealing on the ADSC response and microhardness of amorphous and crystalline poly(ethylene naphthalate)

M. Krumova, J. Karger-Kocsis

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The tensile loading - induced necking in notched specimens of amorphous poly(ethylene naphthalate) (PEN) was studied by conventional (DSC) and alternating differential scanning calorimetry (ADSC) and microhardness measurements. It was shown that in this PEN, similarly to amorphous copolyesters, necking occurred via cold drawing and not via true plastic deformation. The variation of the microhardness along the height and width of the necked region of the specimen reflects the specific orientation of the material during tensile loading. It was observed that the tensile loading provokes a drastic (jump-like) orientation of the macromolecules in draw direction, which even increases in the vicinity of the tip of the necked zone.

Original languageEnglish
Pages (from-to)321-333
Number of pages13
JournalInternational Journal of Polymeric Materials
Volume50
Issue number3-4
Publication statusPublished - Dec 1 2001

Keywords

  • Alternating differential scanning calorimetry (ADSC)
  • Cold crystallization
  • Cold drawing
  • Microhardness
  • Necking
  • Polyethylene naphthalate (PEN)

ASJC Scopus subject areas

  • Analytical Chemistry
  • Chemical Engineering(all)
  • Polymers and Plastics

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