Accession Number : ADA141485

Title :   Pressure-Dependence of Glass Transition Temperature of Elastomeric Glasses.

Descriptive Note : Interim rept.,

Corporate Author : RUTGERS - THE STATE UNIV PISCATAWAY NJ HIGH PRESSURE MATERIALS RESEARCH LAB

Personal Author(s) : Pae,K D ; Tang,C L ; Shin,E S

PDF Url : ADA141485

Report Date : 01 May 1984

Pagination or Media Count : 34

Abstract : Pressure dependence of the glass transition temperature (T sub g) of two elastomers, Solithane 113 and 3,3-Bis(azidomethyl)oxetane/tetrahydrofuran (BAMO/THF) has been determined, employing high pressure differential thermal analysis (HP-DTA) and dielectric techniques, up to 8.5 Kbar. The glasses of the elastomers were named the specific (or P sub i - glass) or the general glass depending on how the glasses were formed. A P sub i - glass was formed by lowering temperature under a constant pressure (P sub i) and the pressure dependency of the P sub i - glass was determined after changing pressure only in the glassy state. The general glass consists of a series of specific glasses but the T sub g is determined only at pressure under which the glass is formed. The T sub g for both glasses appears to level off at very high pressures while the T sub g does not level off for the general glass. Thermodynamic analysis was made to show that for many general glasses including Solithane, n = 1 in dT sub g/dp = alpha delta/(1 + n) delta alpha. It is also shown that variation in several parameters in the Gibbs and DiMarzio theory can be used effectively to predict the observed experimental results. (Author)

Descriptors :   *Elastomers, *Polymers, *Pressure, *Transition temperature, *Glass, Differential thermal analysis, Theory, Dielectrics, Vitreous state, Thermodynamics

Subject Categories : Plastics
      Thermodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE