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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
chemistry
Positron annihilation in cardo-based polymer membranes
Journal of Physical Chemistry B, Volume 118, No. 22, Year 2014
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Description
Positron annihilation lifetime spectroscopy (PALS) is applied to a series of bis(aniline)fluorene and bis(xylidine)fluorene-based cardo polyimide and bis(phenol)fluorene-based polysulfone membranes. It was found that favorable amounts of positronium (Ps, the positron-electron bound state) form in cardo polyimides with the 2,2-bis(3,4-dicarboxyphenyl) hexafluoropropane dianhydride (6FDA) moiety and bis(phenol)fluorene-based cardo polysulfone, but no Ps forms in most of the polyimides with pyromellitic dianhydride (PMDA) and 3,3′,4,4′-biphenyltetracarboxylic dianhydride (BTDA) moieties. A bis(xylidine)fluorene-based polyimide membrane containing PMDA and BTDA moieties exhibits a little Ps formation but the ortho-positronium (o-Ps, the triplet state of Ps) lifetime of this membrane anomalously shortens with increasing temperature, which we attribute to chemical reaction of o-Ps. Correlation between the hole size (Vh) deduced from the o-Ps lifetime and diffusion coefficients of O2 and N2 for polyimides with the 6FDA moiety and cardo polysulfone showing favorable Ps formation is discussed based on free volume theory of gas diffusion. It is suggested that o-Ps has a strong tendency to probe larger holes in rigid chain polymers with wide hole size distributions such as those containing cardo moieties, resulting in deviations from the previously reported correlations for common polymers such as polystyrene, polycarbonate, polysulfone, and so forth. © 2014 American Chemical Society.
Authors & Co-Authors
Kobayashi, Yoshinori
Japan, Tsukuba
National Institute of Advanced Industrial Science and Technology
Japan, Sendai
Tohoku University
Kazama, Shingo
Japan, Tokyo
Nippon Steel Corporation
Inoue, K.
Japan, Sendai
Tohoku University
Toyama, T.
Japan, Sendai
Tohoku University
Nagai, Y.
Japan, Sendai
Tohoku University
Haraya, K.
Japan, Tsukuba
National Institute of Advanced Industrial Science and Technology
Mohamed, Hamdy F.M.
Egypt, Minya
Faculty of Science
Orouke, B. E.
Japan, Tsukuba
National Institute of Advanced Industrial Science and Technology
Oshima, N.
Japan, Tsukuba
National Institute of Advanced Industrial Science and Technology
Kinomura, Atsushi
Japan, Tsukuba
National Institute of Advanced Industrial Science and Technology
Suzuki, Ryouichi
Japan, Tsukuba
National Institute of Advanced Industrial Science and Technology
Statistics
Citations: 22
Authors: 11
Affiliations: 4
Identifiers
Doi:
10.1021/jp501706d
ISSN:
15206106
e-ISSN:
15205207