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

Rodrigo Lima de Miranda; Jan Kruse; Klaus Rätzke; Franz Faupel; Detlev Fritsch; Volker Abetz; Peter M. Budd; James D. Selbie; Neil B. McKeown; Bader S. Ghanem

doi:10.1002/pssr.200701116

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

Rodrigo Lima de Miranda, Jan Kruse, Klaus Rätzke^*, Franz Faupel, Detlev Fritsch, Volker Abetz, Peter M. Budd, James D. Selbie, Neil B. McKeown, Bader S. Ghanem

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

32 Scopus citations

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.

Original language	English (US)
Pages (from-to)	190-192
Number of pages	3
Journal	Physica Status Solidi - Rapid Research Letters
Volume	1
Issue number	5
DOIs	https://doi.org/10.1002/pssr.200701116
State	Published - Oct 2007
Externally published	Yes

ASJC Scopus subject areas

Condensed Matter Physics
General Materials Science

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title = "Unusual temperature dependence of the positron lifetime in a polymer of intrinsic microporosity",

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.",

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AU - de Miranda, Rodrigo Lima

AU - Kruse, Jan

AU - Rätzke, Klaus

AU - Faupel, Franz

AU - Fritsch, Detlev

AU - Abetz, Volker

AU - Budd, Peter M.

AU - Selbie, James D.

AU - McKeown, Neil B.

AU - Ghanem, Bader S.

PY - 2007/10

Y1 - 2007/10

N2 - 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.

AB - 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.

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

Abstract

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