Accession Number : AD0625329

Title :   THE VISCOELASTIC RELAXATION MECHANISM OF INORGANIC POLYMERS. IV. SIMULTANEOUS MULTIPLE MECHANISMS.

Descriptive Note : Technical rept.,

Corporate Author : CALIFORNIA UNIV LOS ANGELES DEPT OF CHEMISTRY

Personal Author(s) : Eisenberg,A. ; Saito,S. ; Teter,L. A.

Report Date : 15 DEC 1965

Pagination or Media Count : 27

Abstract : The viscoelastic properties of two polymers were studied in which both molecular (diffusional) motions and bond interchange were present in the glass transition region. The materials were a lanthanum (La(+3)) doped sodium polyphosphate and an arsenic doped sulfur polymer. It is shown that (just as in the case of the acrylate polymers studied by Ferry) the two mechanisms have two different compliance curves associated with them which move with bond interchange and the other to the diffusional motion of the chains. On the basis of activation energy arguments the compliance curves are matched with the mechanisms, and the relative contributions to the total viscosity due to each mechanism are given as a function of temperature. (Author)

Descriptors :   (*INORGANIC POLYMERS, VISCOELASTICITY), (*VISCOELASTICITY, RELAXATION TIME), (*PHOSPHATES, INORGANIC POLYMERS), (*SULFUR, INORGANIC POLYMERS), PHASE STUDIES, DIFFUSION, CHEMICAL BONDS, SODIUM, IMPURITIES, DOPING, LANTHANUM, ARSENIC, HEAT OF ACTIVATION, VISCOSITY, THERMAL PROPERTIES, STRESSES

Subject Categories : Physical Chemistry
      Polymer Chemistry
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE