THE INFLUENCE OF COHESIVE FORCES ON THE GLASS TRANSITION TEMPERATURES OF POLYMERS.
ROYAL AIRCRAFT ESTABLISHMENT FARNBOROUGH (UNITED KINGDOM)
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The relationship between cohesive energy c.e. or cohesive energy density c.e.d. and the glass transition temperature T sub G of polymers was re-examined on the basis of literature data. For polymers with T sub Gs above 25 C there is no correlation between published or calculated values of c.e. or c.e.d. and T sub G. However, for the rest of the polymers there is a linear relationship between c.e.d. and T sub G, and a broad relationship between c.e. and T sub G. These results imply that c.e.d. is the regulating, though not the only, factor in determining T sub Gs up to values of approximately 25 C. Author