Abstract
Differential thermal analysis was carried out on pory(oxymethylene) [polytetraoxane] obtained by radiation-induced polymerization of tetraoxane in the solid state. The profile of the melting endotherm is related mainly to the polymer yield and the melting point mainly to the molecular weight of the polymer obtained. The degradation of the polymer chain during the polymerization in air causes the destruction of the polymer crystal formed already, and produces various types of crystallite in the view of the melting behavior.Polytetraoxane crystals are easily annealed above 160°C, i.e., at the temperature range from 160 to 170°C crystals of higher melting point are obtained after rearrangement; at the range from 170 to 180°C, a new endotherm, probably of the new crystal formed after the partial melting, is observed at about 165°C, and at the range from 180 to 187°C, a single endothermic peak, probably of the crystal formed after the wide range partial melting, is observed at a lower temperature than that of the melt-crystallized sample. It is suggested that the original polymer crystal may be of the extended chain structure which the crystal rearranges, and that the new crystal formed after the annealing above 170°C may be of the folded chain structure.
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Y. Nakase, M. Yoshida, A. Ito, and K. Hayashi, J. Polym. Sci., Part A-1, 9, 465 (1971).
E. Kobayashi and S. Okamura, J. Appl. Polym. Sci., 12, 1661 (1968).
Y. Nakase, M. Yoshida, A. Ito, and K. Hayashi, J. Polym. Sci., Part A-1, 10, 2181 (1972).
Y. Chatani, T. Uchida, H. Tadokoro, K. Hayashi, M. Nishii, and S. Okamura, J. Macromol. Sci., Phys., B2, 567 (1968).
T. Amano, E. W. Fisher, and G. Hinrichsen, J. Macromol. Sci., Phys., B3, 209 (1969).
A. Munoz-Escalona and G. Wegner, Makromol. Chem., 148, 331 (1971).
T. Ozawa, Nippon Kagaku Zasshi (J. Chem. Soc. Japan, Pure Chem. Sect.), 88, 532 (1967).
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Nakase, Y., Kuriyama, I. Differential Thermal Analysis of Polytetraoxane Obtained by Radiation-Induced Polymerization in the Solid State. Polym J 4, 517–525 (1973). https://doi.org/10.1295/polymj.4.517
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DOI: https://doi.org/10.1295/polymj.4.517