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Defects in polydiacetylene single crystals

Part 1 The perfect crystal and stacking faults

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Abstract

The structure of single crystals of a substituted polydiacetylene (pTS) has been investigated using transmission electron microscopy. The structure of the perfect crystal has been examined and it has been shown that the molecules lie in the plane of the lamellar crystals in an extended-chain conformation. The formations of bend contour zone axis patterns has been analysed and they are found to be due to the crystal being deformed into the shapes of both cups (or domes) and saddles. A common defect in the crystals was a stacking fault; using dark-field microscopy it has been found to have a displacement vector of 1/2 [1¯21]. It has been shown that such a stacking fault can be accommodated without any disruption to either the molecular backbone or the relatively large sidegroups on the molecule. The significance of these stacking faults with regard to the structure of polymer crystals in general is discussed.

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Authors and Affiliations

  1. Department of Materials, Queen Mary College, Mile End Road, E1 4NS, London, UK

    R. J. Young & R. T. Read

  2. Werkstoffphysik und Werkstofftechnologie, University of the Saarland, Bau 2, 6600, Saarbrücken, W. Germany

    J. Petermann

Authors
  1. R. J. Young
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  2. R. T. Read
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  3. J. Petermann
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Young, R.J., Read, R.T. & Petermann, J. Defects in polydiacetylene single crystals. J Mater Sci 16, 1835–1842 (1981). https://doi.org/10.1007/BF00540631

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  • DOI: https://doi.org/10.1007/BF00540631

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