Hole size distributions in cardo-based polymer membranes deduced from the lifetimes of ortho-positronium

Y. Kobayashi, A. Kinomura, S. Kazama, K. Inoue, T. Toyama, Y. Nagai, K. Haraya, H. F.M. Mohamed, B. E. O'Rourke, N. Oshima, R. Suzuki

Research output: Contribution to journalConference articlepeer-review

2 Citations (Scopus)

Abstract

To clarify the free volume size distributions of the cardo-based polymer membranes, where ortho-positronium (o-Ps) undergoes pick-off annihilation, the o-Ps lifetime distributions were analyzed by the LT9 programme. It was found that the cardo-based polysulfone membrane has much narrower o-Ps lifetime/hole size distributions than the cardo-based polyimide membranes with the 2,2-bis(3,4-dicarboxyphenyl)hexafluoropropane dianhydride (6FDA) moiety. Further, the lifetime/hole size distributions of the cardo-based polymer membranes are appreciably broadened with increasing temperature. This suggests that in these membranes there are holes not only of different sizes but also of different thermal expansion coefficients. It is also shown that in a membrane with a wider hole size distribution the average o-Ps lifetime tends to be longer than would be expected from the correlation between the o-Ps lifetime and the total free volume for common polymers.

Original languageEnglish
Article number012017
JournalJournal of Physics: Conference Series
Volume674
Issue number1
DOIs
Publication statusPublished - 2016 Jan 26
EventInternational Workshop on Positron Studies of Defects 2014, PSD 2014 - Kyoto, Japan
Duration: 2014 Sep 142014 Sep 19

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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