Accession Number : AD0616161

Title :   ISOTHERMAL DIFFUSION IN SYSTEMS WITH GLASSLIKE TRANSITIONS,

Corporate Author : BELL TELEPHONE LABS INC MURRAY HILL N J

Personal Author(s) : Frisch,H. L.

Report Date : 28 JUL 1964

Pagination or Media Count : 6

Abstract : Following Simon, we define fluid systems with a 'glasslike' transition as systems which above the transition temperature are, and below the transition temp. are not in internal chemical equilibrium with respect to a set of unspecified internal parameters of even tensorial rank. Flow equations for the chemical components of such systems are presented in various frames of references. In particular, in a mass-fixed frame of reference, besides a variation in the Onsager coefficients, the flow equations below the transition temp. are subject to a different set of subsidiary conditions (the 'new' GibbsDuhem equations). The consequences of the assumption of sorption equilibrium at the surface of the diffusion system are studied. Below the transition temp. these systems will possess history-dependent diffusion coefficients and be subject to time-dependent surface concentrations. These time dependencies are related to the relaxation of the internal parameters of the system below the transition temp. (Author)

Descriptors :   (*PHASE STUDIES, TRANSFORMATIONS), (*DIFFUSION, THERMODYNAMICS), (*POLYMERS, DIFFUSION), (*SORPTION, THERMODYNAMICS), TRANSITION TEMPERATURE, GLASS, FLUID FLOW, CHEMICAL EQUILIBRIUM, PENETRATION

Distribution Statement : APPROVED FOR PUBLIC RELEASE