Physical Aging Studies of Semicrystalline Poly(ethylene Terephthalate).

Abstract

Physical aging of semicrystalline poly(ethylene terephthalate) has been investigated as a function of crystalline content. Stress-strain, stress relaxation, and differential scanning calorimetry experiments were used to monitor the physical aging process. It was found that both the overall extent and the rate of physical aging in this material decrease with increasing crystallinity. Several possible reasons for this behavior are advanced and discussed. It was also found that the drawing behavior of amorphous PET changes significantly as physical aging progresses. Specifically, for samples aged and then elongated, the extent of localized deformation (necking) and associated strain-induced crystallization was greater for samples aged for longer periods of time. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Nov 09, 1979
Accession Number
ADA079607

Entities

People

  • Garth L. Wilkes
  • Martin R. Tant

Organizations

  • Virginia Tech

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Amorphous Materials
  • Block Copolymers
  • Composite Materials
  • Copolymers
  • Dielectric Polymers
  • Elongation
  • Engineering
  • Glass
  • Materials
  • Measuring Instruments
  • Molecules
  • Polymers
  • Relaxation Time
  • Stress Strain Relations
  • Stresses
  • United States
  • Virginia

Fields of Study

  • Materials science

Readers

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  • Polymer Science and Technology
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