Abstract
Thermal properties of 4,4′(2,2′-propylidene)-diphenol, referred to as bisphenol A, or BPA, are discussed. Parameters of thermal transitions were measured by DSC. The commercial product crystallizes in α-form crystals which melt at 157°C (onset) and 161°C (peak) with a heat of fusion 134.37 J g−1. Supercooled BPA shows a glass transition at about 40°C. Almost identical results were obtained for samples recovered by different methods: flakes, pastilles and prills. Two new polymorphs, the β and γ-forms were identified. The β-form melts at 131°C with a heat of fusion of 104.9 J g−1. The melting point of the γ-form was measured to be 138°C and its heat of fusion is 118.3 J g−1. Thermal conductivity of crystalline BPA was measured.
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Dedicated to Professor Bernhard Wunderlich on the occasion of his 65th birthday
The author wishes to acknowledge helpful discussions with Dr. C. W. Uzelmeier and Dr. R. L. June during the course of this work. Many thanks go to J. M. Olvera for her help in gathering the experimental data.
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Grebowicz, J.S. Thermal properties of polycarbonate grade bisphenol A. Journal of Thermal Analysis 46, 1151–1166 (1996). https://doi.org/10.1007/BF01983626
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DOI: https://doi.org/10.1007/BF01983626