Fragility of polymeric liquids: correlations between thermodynamic and dynamic properties

摘要

The effect of polymer structure on fragility was determined by relating the apparent fragility to the relaxation response, heat capacity, and thermal expansion. For the 14 polymers studied, the fragility estimates based on the relaxation behavior (log a_T) correlated well with the thermodynamic estimates of DELTA C_p/M_o, and DELTA alpha as measures of fragility. On the other hand, using C_p~1/C_p~g as a fragility criterion resulted in very different fragility classifications.