Evidence for Distinct Sectors in Polymer Single Crystals

IT was reported earlier that long-chain polymers could form single crystals in which the molecules have a regularly folded configuration1,2

D. C. BASSETT

2006

Key concepts

Scholarcy highlights

  • IT was reported earlier that long-chain polymers could form single crystals in which the molecules have a regularly folded configuration1,2
  • Polyethylene in particular can have a paraffin-like crystal habit consisting of thin lozenge-shaped layers with each segment of the folded molecular chain normal, or approximately normal, to the plane of these layers
  • It was suggested3 that the molecules might fold in the plane of the growing faces, which are of the {110} type in the purely lozenge-shaped crystals. This implies that in the four different quadrants the chains are folded along four different <110> directions, and that the apparent single crystal consists of four structurally distinct sectors in twin relation. As we know, this situation is unprecedented in crystalline substances

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