Abstract
An elementary process preceding glass transition was found in the measurement of the thermal shrinkage of cold-drawn polycarbonate (PC) film by a thermo-mechanical analyzer. An activation energy spectrum associated with the shrinkage of 7% cold-drawn PC was derived using Primak’s method for processes distributed in activation energy. The spectrum showed two maxima centered at about 15 and 18 kcal/mol, respectively. This was consistent with the result of dielectric measurements. In the latter, two additional relaxations due to the drawing effect were observed. These molecular relaxations indicate the existence of limited chain-backbone motions in the glassy state of cold-drawn PC. It was also shown that molecular packing is closely related to these relaxations.
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Kochi, M., Sasaki, T. & Kambe, H. An Elementary Process in the Thermal Shrinkage of Cold-Drawn Polycarbonate. Polym J 10, 169–172 (1978). https://doi.org/10.1295/polymj.10.169
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DOI: https://doi.org/10.1295/polymj.10.169