Methods of investigation calorimetric method of determining the glass transition temperatures of polymers immersed in solvents

Abstract

On the basis of a study of the interconnection between the dynamics of heat evolution processes and the physical state of polymers on solvation, a method is developed for determining the temperature of transition of polymers from the glass-like state in to the high elastic state from kinetic data obtained in calorimetric measurements. The essence of the method is determination of the duration of the heat evolution processes over the temperature range under study and revealing of the glass transition temperature of the solvated polymer from the inflection point on the plot of temperature against this parameter. The values of the glass transition temperature thus obtained for cellulose triacetate filaments in benzyl and butyl alcohols (321 and 346 K) and cotton cellulose in DMFA (338 K) are in agreement with the results of the thermomechanical study.