Temperature dependence of the free volume in polytetrafluoroethylene studied by positron annihilation spectroscopy |
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| Institution: | 1. Physics Department, Faculty of Science, El-Minia University, B.O. 61519 El-Minia, Egypt;1. ICA, Slovak Academy of Sciences, Dúbravská Road 9, 845 03 Bratislava, Slovak Republic;2. Institute of Inorganic Chemistry, Technology and Materials, Slovak University of Technology, Radlinského 9, 812 37 Bratislava, Slovak Republic;1. Brockhouse Institute for Materials Research, McMaster University, Hamilton, ON, Canada L8S 4M1;2. Department of Physics, University of Alberta, Edmonton, AB, Canada T6G 2E1;1. Experimental Nuclear Physics Department (Cyclotron Facility), Nuclear Research Center, Atomic Energy Authority, P.O. 13759, Cairo, Egypt;2. Accelerators and Ion Sources Department, Nuclear Research Center, Atomic Energy Authority, P.O. 13759, Cairo, Egypt;3. Central Lab. for Elemental and Isotopic Analysis, Nuclear Research Center, Atomic Energy Authority, P.O. 13759, Cairo, Egypt;4. Experimental Nuclear Physics Department, Nuclear Research Center, Atomic Energy Authority, P.O. 13759, Cairo, Egypt;5. Physics Department, Faculty of Science, Zagazig University, P.O. 44519, Zagazig, Egypt;1. Istituto per i Processi Chimico-Fisici, Consiglio Nazionale delle Ricerche, INSTM, UdR Pisa,Via G. Moruzzi 1, 56124 Pisa, Italy;2. Dipartimento di Scienze e Innovazione Tecnologica (DISIT), Università del Piemonte Orientale “A. Avogadro”, INSTM, UdR Alessandria,Viale T. Michel 11, 15121 Alessandria, Italy;3. NanoFacility Piemonte, Electromagnetism Division, Istituto Nazionale di Ricerca Metrologica, Strada delle Cacce 91, 10135 Torino, Italy;1. School of Materials Science and Engineering, Wuhan University of Technology, Wuhan, Hubei 430072, China;2. Faculty of Chemistry and Material Science, Hubei Engineering University, Xiaogan, Hubei 432000, China |
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| Abstract: | The temperature dependence of the free volume holes in pure polytetrafluoroethylene (PTFE) and doped with 25% glass have been studied in the temperature range (30–250 °C) using positron annihilation lifetime spectroscopy. The data clearly revealed the glass transition temperatures for pure and doped PTFE are 130 and 110 °C, respectively. As the temperature increases, the free volume distribution becomes positioned at larger free volume hole size. A good correlation between the electrical conductivity and the o-Ps parameters was achieved. |
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