Summary
The crystallization from the glassy state of poly(oxetane) or poly(trimethylene oxide), after quenching the molten polymer in liquid nitrogen, has been studied by differential scanning calorimetry and X-ray diffraction analysis. The results indicate that two crystalline modifications are obtained, depending on the crystallization temperature: the orthorhombic modification is produced when the temperature is higher than −30 °C, while the trigonal form is found below −45 °C, both forms coexisting at intermediate temperatures.
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Pérez, E., Bello, A. & Fatou, J.G. Effect of quenching on the polymorphic crystallization of poly(oxetane). Polymer Bulletin 18, 59–63 (1987). https://doi.org/10.1007/BF00255823
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DOI: https://doi.org/10.1007/BF00255823