The Relationships Between Polymers and Glass Transition Temperatures. Part 3.
Abstract
In recent years, it has been found that interdependence of the rotations of neighboring bonds is of primary importance to the physical behavior of polymers. Mathematical methods for handling interdependent rotations were developed by Lifson and others for the calculation of characteristic polymer dimensions. The Gibbs-DiMarzio theory of the glass transition in polymers is formulated in such a way that interdependent rotations may be taken into account. Using an empirically estimated value of 0.025 for the free volume fraction at the transition temperature, the Gibbs-DiMarzio theory was fitted to empirically estimated transition temperatures for the n-alkanes, hexane to eicosane. A good fit was obtained with E sub 1 = 768 cal/mole for the energy difference between trans and gauche states, and gauche rotations of opposite sign excluded.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1967
- Accession Number
- ADA306476
Entities
People
- Lawrence V. Gallacher
- O. G. Lewis