MOLECULAR FLOW AND LANTHANUM CATALYZED BOND INTERCHANGE IN SODIUM PHOSPHATE POLYMERS.

Abstract

It is observed that sodium phosphate polymers, in which some of the Na(+) ions have been replaced by La(+++) ions, are subject to both simple molecular flow and to bond interchange in the glass transition region. These two relaxation mechanisms are separated, and their relative contributions to the shear viscosity are calculated. It is shown that the bond interchange mechanism is subject to an activation energy of ca. 50 Kcal, while that of the molecular flow is of the order of 200 Kcal at Tg + 30C; the latter is of the WLF form. It is further shown that the La(+++) ions act as crosslinks, at least at low concentrations, and that the bond interchange occurs at the site of the La(+++) ions, rather than at random along the polymer chain. (Author)

Document Details

Document Type
Technical Report
Publication Date
Jun 01, 1966
Accession Number
AD0635586

Entities

People

  • Adi Eisenberg
  • Shogo Saito

Organizations

  • University of California, Los Angeles

Tags

DTIC Thesaurus Topics

  • Energy
  • Heat Of Activation
  • Inorganic Polymers
  • Lanthanum
  • Polymers
  • Transitions
  • Viscosity

Fields of Study

  • Chemistry

Readers

  • Molecular Photonics/Laser Physics
  • Molecular and Cellular Biochemistry
  • Polymer Science and Engineering.