, Volume 46, Issue 3-4, pp 965-972

The glass transition temperature of polystyrene

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A round robin test was performed to determine the reliability of values for the glass transition temperatureT g as determined by DTA on polymers. Ten different instruments were involved. The test material was high molecular weight polystyrene. Values forT g (midpoint) were reported in the range 107°C±2 K. The respective heat flow curves differed considerably in shape. In the literature aT g of 100°C is often given for polystyrene. The discrepancy between this value and the value of 107°C found in the round robin test is due to three differences: the thermal history of the sample, the evaluation of the heat flow curves, and the effect of finite sample size.

Dedicated to Professor Bernhard Wunderlich on the occasion of his 65th birthday