THE EFFECT OF CRYSTALLIZATION CONDITIONS AND TEMPERATURE ON THE POLYMORPHIC FORMS OF POLYETHYLENE,

Abstract

Experimental evidence (using wide-angle X-ray and dilatometric techniques) is presented to indicate development of a second crystalline form as a result of further crystallization from the melt, and the temperature interval covering its formation and disappearance. Three fractionated samples of polyethylene of viscosity average molecular weights 12 500, 425 000 and 1 000 000 and an unfractionated sample of Marlex 50 of molecular weight 180 000 were used. The extra reflections reported were not observed with rapidly cooled samples. (Author)

Document Details

Document Type
Technical Report
Publication Date
Sep 01, 1964
Accession Number
AD0617640

Entities

People

  • C. H. Baker
  • J. G. Fatou
  • L. Mandelkern

Organizations

  • Florida State University

Tags

DTIC Thesaurus Topics

  • Coverings
  • Critical Temperature
  • Crystallization
  • Dielectric Polymers
  • Glass Transition Temperature
  • Intervals
  • Molecular Weight
  • Polymers
  • Reflection
  • Transition Temperature
  • Viscosity
  • Wide Angles
  • X Rays

Readers

  • Analytical Chemistry
  • Materials Science and Engineering.
  • Polymer Science and Engineering.