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High Temperature Materials and Processes

Editor-in-Chief: Fukuyama, Hiroyuki

Editorial Board: Waseda, Yoshio / Fecht, Hans-Jörg / Reddy, Ramana G. / Manna, Indranil / Nakajima, Hideo / Nakamura, Takashi / Okabe, Toru / Ostrovski, Oleg / Pericleous, Koulis / Seetharaman, Seshadri / Straumal, Boris / Suzuki, Shigeru / Tanaka, Toshihiro / Terzieff, Peter / Uda, Satoshi / Urban, Knut / Baron, Michel / Besterci, Michael / Byakova, Alexandra V. / Gao, Wei / Glaeser, Andreas / Gzesik, Z. / Hosson, Jeff / Masanori, Iwase / Jacob, Kallarackel Thomas / Kipouros, Georges / Kuznezov, Fedor

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Volume 30, Issue 1-2


Temperature and Weight Dependence of Free Volumes in Conducting Composite Polymer Using Positron Annihilation Techniques

Cumali Tav
  • Corresponding author
  • Physics Department, Faculty of Art and Sciences, Marmara University, Kadikoy, Istanbul, Turkey
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/ Serpil Yilmazturk
  • Chemical Engineering Dept., Engineering Faculty, Istanbul University, Avcilar, Istanbul, Turkey
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Published Online: 2011-04-19 | DOI: https://doi.org/10.1515/htmp.2011.028


Polyvinylidene fluoride-co-hexafluoropropylene (PVdF-co-HFP) with conducting polyaniline (PAni) was studied to measure free-volume intensity (I 3), orthopositronium (o-Ps) lifetime (τ 3), and Doppler momentum distribution parameters (S and W) as a function of temperature varying from 273 to 373 K and PAni weight percentage varying from 1%–20% using the techniques of Positron Annihilation Lifetime Spectroscopy (PALS) and Doppler Broadening Annihilation Radiation (DBAR). It has been observed that the free-volume intensity and the o-Ps lifetime increased sharply with PAni weight percentage up to 4% after which decreased slowly. DBAR momentum distribution parameters behaved similarly as well and it's assumed that in the studied samples one-type defect was to exist. The thermal expansion coefficient also as a function of PAni weight was extracted from PALS data.

Keywords.: Positron annihilation lifetime spectroscopy; free volume; conducting polymers; PAni; PVdF-co-HFP; thermal expansion coefficient

About the article

Corresponding author: Cumali Tav, Physics Department, Faculty of Art and Sciences, Marmara University, 34722, Kadikoy, Istanbul, Turkey

Received: 2010-12-01

Accepted: 2011-01-17

Published Online: 2011-04-19

Published in Print: 2011-04-01

Citation Information: High Temperature Materials and Processes, Volume 30, Issue 1-2, Pages 193–198, ISSN (Online) 2191-0324, ISSN (Print) 0334-6455, DOI: https://doi.org/10.1515/htmp.2011.028.

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