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

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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It is observed that sodium phosphate polymers, in which some of the Na ions have been replaced by La ions, are subject to both simple molecular flow and to bond interchange in the glass transition region.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

Author(s):
Eisenberg, Adi ; Saito, Shogo
Author Organization(s):
CALIFORNIA UNIV LOS ANGELES DEPT OF CHEMISTRY
Descriptive Note:
Technical rept.
Supplementary Note:
Paper no. 6 on the Viscoelastic Relaxation Mechanisms in Inorganic Polymers.
Pagination:
0031

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
TR-12
Contract/Grant Number(s):
Nonr-233(87)
Project Number(s):
NR-051-453
 Subject Terms
Communities of Interest:
No COI(s) Identified
Descriptor(s):
(*INORGANIC POLYMERS, *PHOSPHATES), (*SODIUM COMPOUNDS, PHOSPHATES), (*LANTHANUM, CATALYSIS), MOLECULAR PROPERTIES, VISCOELASTICITY, RHEOLOGY, CHEMICAL BONDS, HEAT OF ACTIVATION, CROSSLINKING(CHEMISTRY)
Field(s)/Group(s):
Polymer Chemistry, Atomic and Molecular Physics and Spectroscopy
Keyword(s):
SODIUM PHOSPHATES
Report Date:
1966 Jun 01