The Mechanism of Crazing in Polystyrene

Abstract

The craze initiation and growth process in thin films of polystyrene has been studied via electron microscopy. Inhomogeneity in the surface microstructure gave rise to the formation of c.a. 300A nuclei in which large strains were localized. These randomly distributed nuclei were formed at the glass transition temperature in the presence of bulk shear deformation. A disk shaped microneck zone was ultimately formed by coalescence of these nuclei which was followed by cavitation and fibrillation of this zone at a critical internal hydrostatic tension. Cavity and fibril stability increased with molecular weight above the entanglement molecular weight.

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Document Details

Document Type
Technical Report
Publication Date
Oct 25, 1974
Accession Number
ADA001764

Entities

People

  • Eric Baer
  • Stephen Wellinghoff

Organizations

  • Case Western Reserve University

Tags

Communities of Interest

  • Advanced Electronics
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Biomedical And Dental Materials
  • Dacron
  • Electron Microscopes
  • Electron Microscopy
  • Glass Transition Temperature
  • Materials
  • Materials Science
  • Mechanics
  • Microscopes
  • Plastics
  • Polymer Chemistry
  • Polymers
  • Stress Concentration
  • Stress Strain Relations
  • Thick Films
  • Thin Films
  • Transition Temperature

Fields of Study

  • Physics

Readers

  • Polymer Science and Technology
  • Structural Health Monitoring of Composite Structures.
  • Underwater engineering and Marine Technology.

Technology Areas

  • Microelectronics
  • Microelectronics - Graphene