MECHANICAL PROPERTIES OF POLYMER NETWORKS,

Abstract

The equilibrium elastic properties of polymer networks (stated always with the reservation that true elastic equilibrium is difficult if not impossible to achieve experimentally) are influenced by network defects, notably free strand ends and certain entanglements which appear to be closely related to the coupling entanglements present in uncross-linked polymers of high molecular weight. The time-dependent mechanical properties in small deformations also reflect these defects, and the entanglements may be the primary source of the mechanical losses in rubbery networks which persist to far lower frequencies than could be expected from the motions of individual network strands. At higher frequencies, in the transition between rubberlike and glass-like behavior, the presence of a network affects mechanical properties to a comparatively slight degree, but the presence of the cross-links causes a perceptible decrease in the short-range mobility of the polymer chains. (Author)

Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1964
Accession Number
AD0621194

Entities

People

  • John D. Ferry

Organizations

  • University of Wisconsin–Madison

Tags

DTIC Thesaurus Topics

  • Couplings
  • Elastic Properties
  • Frequency
  • Mechanical Properties
  • Mobility
  • Molecular Weight
  • Physical Properties
  • Plastic Properties
  • Transitions

Readers

  • Materials Science and Engineering.
  • Polymer Science and Technology
  • Systems Analysis and Design