Abstract
The phase diagrams of transtactic polybutadiene–toluene, –diethyl ketone, and –nitrobenzene systems were obtained by the DTA method. The solubility of transtactic polybutadiene in the toluene system increased monotonously on increase in temperature. In the case of the transtactic polybutadiene–diethyl ketone and –nitrobenzene systems, on the other hand, the dissolution curves were horizontal in the region of poor polymer content, indicating that diethyl ketone and nitrobenzene were poor solvents. From an analysis of DTA curves, it was found that the transition (solid–solid) peaks of transtactic polybutadiene were shifted to a higher temperature with a solvent content. This phenomenon is then discussed. The heat of fusion was estimated to be approximately 850 cal/unit mol on average from the equation for the melting point depression, and the heat of transition was estimated to be 1.0 kcal/unit mol from the area of the DTA curve.
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Tamura, K., Baba, Y., Nakatsukasa, K. et al. The DTA of Polymer–Solvent Systems. II. The Phase Diagrams of Transtactic Polybutadiene–Toluene, –Diethyl Ketone, and –Nitrobenzene Systems. Polym J 3, 28–34 (1972). https://doi.org/10.1295/polymj.3.28
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DOI: https://doi.org/10.1295/polymj.3.28