Fine structure of the iii-i transition and molecular motion in polytetrafluoroethylene

Kazumi Matsushige, Ryosuke Enoshita*, Touru Ide, Noriyoshi Yamauchi, Seiji Taki, Tetuo Takemura

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

39 Citations (Scopus)


The fine structure in the III-I transition region and the molecular motion of polytetrafluoroethylene under high pressure have been studied by X-ray diffraction and nuclear magnetic resonance. In the transition region from the high pressure phase III to phase I, two kinds of crystals were observed to coexist over a considerably wide temperature range. This fact suggests that the abnormal attenuation of ultrasonic waves reported in this transition region is due to a density fluctuation of these crystals. Also, a detailed study on the molecular chain conformation and the molecular motion in phase I revealed that there exists in the higher temperature region of phase I a new region, where the molecules have apparently a planar zigzag conformation as a result of right-handed and left-handed helical thermal motions in molecular chains.

Original languageEnglish
Pages (from-to)681-687
Number of pages7
JournalJapanese journal of applied physics
Issue number5
Publication statusPublished - 1977 May
Externally publishedYes

ASJC Scopus subject areas

  • General Engineering
  • General Physics and Astronomy


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