A room-temperature transition in polytetrafluoroethylene

ABSTRACT IN the course of determinations of the variation of the specific volume of polytetrafluoroethylene with temperatures between = 30° and + 360° C., a phenomenon was observed at about

20° C. which is, to the best of our knowledge, unique in the polymer field. Below 15° and above 25° C., the cubical coefficients of expansion are roughly the same and of the order of 3 ×

10-4 c.c./c.c./° C., but at about 20° C. there is a 1 per cent increase in volume; data for five different samples of polytetrafluoroethylene are presented in the accompanying curves. The

results for any single sample are reproducible, and the same curve is obtained on approaching the transition region from low and high temperatures. Access through your institution Buy or

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08 November 2024 REFERENCES * Boyer and Spencer, "_Advances in Colloid Science_", 2, 1 (Interscience, New York, 1946). Google Scholar  * Bunn and Garner, _Proc. Roy. Soc._, A, 189,

39 (1947). ADS  CAS  Google Scholar  Download references AUTHOR INFORMATION AUTHORS AND AFFILIATIONS * Plastics Division, Research Department, Imperial Chemical Industries, Ltd., Welwyn

Garden City, Herts H. A. RIGBY & C. W. BUNN Authors * H. A. RIGBY View author publications You can also search for this author inPubMed Google Scholar * C. W. BUNN View author

publications You can also search for this author inPubMed Google Scholar RIGHTS AND PERMISSIONS Reprints and permissions ABOUT THIS ARTICLE CITE THIS ARTICLE RIGBY, H., BUNN, C. A

Room-Temperature Transition in Polytetrafluoroethylene. _Nature_ 164, 583 (1949). https://doi.org/10.1038/164583a0 Download citation * Issue Date: 01 October 1949 * DOI:

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