Unusual temperature dependence of the positron lifetime in a polymer of intrinsic microporosity

Lima de Miranda, Rodrigo, Kruse, Jan, Rätzke, Klaus, Faupel, Franz, Fritsch, Detlev, Abetz, Volker, Budd, Peter M., Selbie, James D., McKeown, Neil B. and Ghanem, Bader S. 2007. Unusual temperature dependence of the positron lifetime in a polymer of intrinsic microporosity. Physica Status Solidi (Rrl) Rapid Research Letters 1 (5) , pp. 190-192. 10.1002/pssr.200701116

Full text not available from this repository.

Abstract

The performance of polymeric membranes for gas separation is mainly determined by the free volume. Polymers of intrinsic microporosity are interesting due to the high abundance of accessible free volume. We performed measurements of the temperature dependence of the positron lifetime, generally accepted for investigation of free volume, in two polymers of intrinsic microporosity (PIM-1 and PIM-7) in the range from 143 to 523 K. The mean value of the free volume calculated from the ortho-positronium lifetime is in the range of typical values for high free volume polymers. However, the temperature dependence of the local free volume is non-monotonous in contrast to the macroscopic thermal expansion. The explanation is linked to the spirocenters in the polymer.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Chemistry
Subjects:	Q Science > QD Chemistry
Uncontrolled Keywords:	61.41.+e;65.60.+a;71.60.+z;78.70.Bj;81.05.Lg;81.05.Ru
Publisher:	Wiley-Blackwell
ISSN:	1862-6254
Last Modified:	19 Mar 2016 23:12
URI:	https://orca.cardiff.ac.uk/id/eprint/42812

Citation Data

Cited 29 times in Scopus. View in Scopus. Powered By Scopus® Data

Actions (repository staff only)

Edit Item