Study of temperature fields in samples of polymer materials using dynamic mechanical analysis

   The goal of the study is to reveal the dependence of the glass transition temperature on conditions of its determination. We present the results of studying temperature fields in the samples of polymer materials by the method of dynamic mechanical analysis. Changes in the glass transition temperature of the poly­mer casting VSE-34 and the temperature profile in the polymer matrix ED-20/DAFS were analyzed. Stan­dard melting samples were used to correct the test results using the correction function. It is shown that the most significant temperature deviations are observed when measured in argon and helium media with heating rates of 1, 2, 5, and 5 K/min. The temperature distribution over the polymer casting sample is highly non-uniform. The difference between the temperature in the middle and at a distance of 1/4 from the edge of the sample equals 16°C (medium — argon, heating rate — 5 K/min). Moreover, at a heating rate of 1 K/min, abnormally low values of the glass transition index were marked. The results obtained can be used to improve the measurement procedure, reduce test duration and refine the results of tests in various gaseous media.

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