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Thermal conductivity of polytetrafluoroethylene and polytrifluorochloroethylene |
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| Authors: | Dr. Makoto Hattori |
| Affiliation: | (1) Department of Applied Chemistry, College of Engineering, University of Osaka Prefecture, Prefelcture Sakai-shi, Japan |
| Abstract: | Summary Measurements of thermal conductivity were made on polytetrafluoroethylene and polytrifluorochloroethylene which were crystallized by various heat treatments. The variation of thermal conductivity with the degree of crystallinity can be explained qualitatively in terms of the difference of the mean free path. An approximate calculation of the mean free path for the amorphous polytrifluorochloroethylene was made. The calculation gives the value of the mean free path which is very close to the atomic distances in the polymer molecule. Zusammenfassung Die thermische Leitf?higkeit von Polytetrafluor?thylen und Polytrifluorchlor?thylen wurde an Proben gemessen, die durch verschiedene W?rmebehandlungen kristallisiert wurden. Die ?nderung der thermischen Leitf?higkeit mit dem Kristallisationsgrad kann qualitativ durch die Unterschiede der mittleren freien Wegl?nge erkl?rt werden. Eine absch?tzende Berechnung der mittleren freien Wegl?nge des Polytrifluorchlor?thylens wurde durchgeführt. Die berechneten Werte liegen nahe an den Atomabst?nden der Polymermoleküle. With 4 figures and 1 table This article is Part VI of the series “Studies on Thermal Conductivity of High Polymers”. Part I–V of this series were presented in High Polymer Chem., Japan (Kobunshi Kagaku). |
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