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Molecular motion in polytetrafluoroethylene at cryogenic temperatures

1967; Taylor & Francis; Volume: 1; Issue: 4 Linguagem: Inglês

10.1080/00222346708212363

1525-609X

E. S. Clark,

Fiber-reinforced polymer composites

Abstract Speculation is offered on the nature of the molecular motion in crystals of polytetrafluoroethylene at temperatures well below the 19°C transition. It is proposed that a specific type of defect in the chain, a helix reversal point, creates a mechanism whereby large dynamic angular displacements of chain segments about their long axes can occur without significantly affecting the X-ray diffraction data.