Epitaxial crystallization of poly(tetramethylene terephthalate) from dimethyl phthalate solution on alkali halide crystals has been studied using electron microscopy and electron diffraction techniques. Rod-like crystals oriented in the 〈110〉 directions of the substrate were found to form at short crystallization times. At longer times, however, lamella-like crystals, which were nucleated at the sides of the rod-like crystals, grew in directions dictated by the substrate. Besides the normal bidirectional orientations induced by the substrate, the polymer crystals showed twinning which was found to be due to the triclinic lattice structure of the polymer.
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Ghavamikia, H., Rickert, S.E. Surface controlled crystallization of poly(tetramethylene terephthalate). J Mater Sci 18, 2969–2975 (1983). https://doi.org/10.1007/BF00700779
- Electron Diffraction