Pressure-Dependence of Glass Transition Temperature of Elastomeric Glasses.
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)
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1984
- Accession Number
- ADA141485
Entities
People
- C. L. Tang
- E. S. Shin
- K. D. Pae
Organizations
- Rutgers University–New Brunswick