Polymer Morphology and Transport

Abstract

The goal of this research was to gain an understanding of the transport/morphology relationships in semi-crystalline polymers. It was hoped that this research would lead to the development of inexpensive high barrier materials with desirable mechanical properties. Briefly we have found that: 1) Uniaxial drawing is an extremely effective way to increase the barrier of semicrystalline films. For HDPE with a 20x draw, barrier improves by a factor of = 500 for carbon tetrachloride; = 50-100 for diatomic oxygen and carbon dioxide and = 25 for helium. 2) The mechanism for this improvement is less clearly understood; however it is not due to major changes in percentages crystallinity or an increase in amorphous density. At this stage it appears to be due to a reduction in amorphous chain mobility. Keywords: Diffusion; Morphology; Sorption; Draw ratio; HDPE(High Density Polyethylene).

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Document Details

Document Type
Technical Report
Publication Date
Aug 10, 1988
Accession Number
ADA201167

Entities

People

  • H. J. Sha
  • I. R. Harrison

Organizations

  • Pennsylvania State University

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Carbon Dioxide
  • Carbon Tetrachloride
  • Coefficients
  • Detectors
  • Diffusion
  • Diffusion Coefficient
  • Films
  • High Density
  • Materials
  • Measurement
  • Mechanical Properties
  • Mobility
  • Molecules
  • Single Crystals
  • Sorption
  • Thermal Analysis
  • Transport Properties

Fields of Study

  • Materials science

Readers

  • Polymer Science and Engineering.
  • Theoretical Analysis.
  • Thin Film Deposition Science.