Abstract
Thermal expansion, specific heat, and ultrasonic sound velocity measurements made on a series of free-radical polymerized poly- methyl, ethyl, and n-butyl methacrylates (PMMA, PEMA, PBMA) as a function of temperature, exhibit variations in the glass transitional temperature, Tg, values from those postulated for conventional polymers. Several secondary transitions were also observed. Variations in Tg were at first attributed to the polymerization and subsequent annealing of the original polymers, however, further thermal treatments suggested the possibility of specific isotatic and syndiotactic molecular orientations. Anomalous structural features were also detected by infrared spectroscopy. Thermodynamic and mechanical data such as the linear coefficient of thermal expansion, the ultrasonic longitudinal sound velocity,and the specific heat were affected by the postulated transitions.
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Urzendowski, S.R., Benson, D.A., Guenther, A.H. (1972). Multiple Transitional Regions Observed in Several Free-Radical Polymerized Polymethacrylates by Thermal, Ultrasonic and Optical Techniques. In: Wiedemann, H.G. (eds) Thermal Analysis. Birkhäuser, Basel. https://doi.org/10.1007/978-3-0348-5775-8_32
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DOI: https://doi.org/10.1007/978-3-0348-5775-8_32
Publisher Name: Birkhäuser, Basel
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