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Melting of polyoxymethylene

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Summary

The melting of polyoxymethylene has been analyzed by differential thermal analysis at varying heating rates. Extended chain crystals (F) and folded chain single crystals (SC), hedrites (H), dentrites (D), and spherulites (S) were made and characterized by interference microscopy, electron microscopy, X-ray diffraction, and density and refractive index measurement. Each morphology showed a different time dependent melting behavior. F superheat before melting. SC, H, and D reorganize or recrystallize on heating. S may show cold crystallization of ill crystallized portions on heating. Crystallinities decrease in order F, SC, H. D, S, while zero entropy production melting points decrease in order F, S, SC, H. D. The equilibrium melting point of extended chain crystals is 182.5 °C. The free energy of fold surfaces is estimated to be 49 ergs/cm2. A scheme of characterizing polymer samples by the change in melting temperature with heating rate is developed. A comparison with earlier measurements on polyethylene and polytetrafluoroethylene is attempted. Literature data are discussed.

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  1. M. Jaffe & B. Wunderlich

    Present address: Department of Chemistry Rensselaer Polytechnic Institut, Troy, N.Y., USA

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    1. M. Jaffe
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    To Prof. Dr. F. H. Müller on his Sixtieth Birthday.

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    Jaffe, M., Wunderlich, B. Melting of polyoxymethylene. Kolloid-Z.u.Z.Polymere 216, 203–216 (1967). https://doi.org/10.1007/BF01525084

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    • DOI: https://doi.org/10.1007/BF01525084

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