Abstract
A new type of DTA apparatus was constructed to detect glass transition and low temperature crystallization phenomena of Poly(tetrahydrofuran). Heat capacities were measured for two kinds of samples, annealed and rapidly cooled, in the temperature region between 11 and 330°K by using an adiabatic calorimeter. Thermal treatment effect was examined and the following thermodynamic values were determined: Tg=185 and 190°K and ΔCp (at Tg)=19.4 and 15.8 J°K−1mol−1, for rapidly cooled and annealed samples respectively. For the completely crystalline state, Tm=314°K, ΔHm=12.4 KJmol−1, and ΔSm=39.3 J°K−1mol−1 were found. Further, heat capacities were analysed by using Tarasov’s model. Glass transition temperatures of several polyethers were compared using our data and those from other workers.
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Yoshida, S., Suga, H. & Seki, S. Thermodynamic Studies of Solid Polyethers. III. Poly(tetrahydrofuran), –[–(CH2)4O–]–n. Polym J 5, 25–32 (1973). https://doi.org/10.1295/polymj.5.25
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DOI: https://doi.org/10.1295/polymj.5.25
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