Viscoelastic Properties of Poly(ethylene-g-styrene).

Abstract

The Time Temperature Superposition Principle was applied to the stress relaxation isotherms of two samples of poly-(ethylene-g-styrene). The graft copolymers were prepared by mutual irradiation of polyethylene powder and styrene monomer in a nuclear reactor source, one containing 12% (PEGS/12) and the other 58% styrene (PEGS/58). The shift factor data when plotted versus the reciprocal of temperature yielded a straight line in the region of -20C and 70C with an activation energy of 32 kcal/mole. From the viscoelastic master curves the relaxation spectra were determined by the second approximation method. The dynamic moduli computed by the interconversion technique can then be shifted from the logarithmic time axis to temperature axis by using the shift factor data obtained in stress relaxation isotherms. The calculated curves were compared with the experimental dynamic mechanical data. Agreement was semi-quantitative for the storage moduli, but only qualitative for the loss moduli. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Nov 01, 1976
Accession Number
ADA035300

Entities

People

  • D. R. Hansen
  • J. Diamant
  • Meikun Shen

Organizations

  • University of California, Berkeley

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Alkenes
  • Chemical Engineering
  • Copolymers
  • Dielectric Polymers
  • Energy
  • Engineering
  • Ethylenes
  • Films
  • Frequency
  • Heat Of Activation
  • Isotherms
  • Mechanical Properties
  • Military Research
  • Nuclear Reactors
  • Polymers
  • Spectra
  • Viscoelasticity

Readers

  • Approximation Theory.
  • Materials Science and Engineering.
  • Polymer Science and Technology

Technology Areas

  • Microelectronics