Free volume dilatation in polymers by ortho-positronium

Publication: Research - peer-reviewJournal article – Annual report year: 2012

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Free volume dilatation in polymers by ortho-positronium. / Winberg, P.; Eldrup, Morten Mostgaard; Maurer, F.H.J.

In: Journal of Chemical Physics, Vol. 136, 2012, p. 244902.

Publication: Research - peer-reviewJournal article – Annual report year: 2012

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Author

Winberg, P.; Eldrup, Morten Mostgaard; Maurer, F.H.J. / Free volume dilatation in polymers by ortho-positronium.

In: Journal of Chemical Physics, Vol. 136, 2012, p. 244902.

Publication: Research - peer-reviewJournal article – Annual report year: 2012

Bibtex

@article{5012d185682f4c07ba2a968e9446cc58,
title = "Free volume dilatation in polymers by ortho-positronium",
publisher = "American Institute of Physics",
author = "P. Winberg and Eldrup, {Morten Mostgaard} and F.H.J. Maurer",
note = "Copyright (2012) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Journal of Chemical Physics / Volume 136 and may be found at http://jcp.aip.org/resource/1/jcpsa6/v136/i24/p244902_s1",
year = "2012",
doi = "10.1063/1.4729561",
volume = "136",
pages = "244902",
journal = "Journal of Chemical Physics",
issn = "0021-9606",

}

RIS

TY - JOUR

T1 - Free volume dilatation in polymers by ortho-positronium

A1 - Winberg,P.

A1 - Eldrup,Morten Mostgaard

A1 - Maurer,F.H.J.

AU - Winberg,P.

AU - Eldrup,Morten Mostgaard

AU - Maurer,F.H.J.

PB - American Institute of Physics

PY - 2012

Y1 - 2012

N2 - The possibility of positronium induced free volume cavity expansion in some polymers above the glass transition temperature was investigated using experimental positron annihilation lifetime data from the literature for polydimethylsiloxane, polyisobutylene, and polybutadiene as function of temperature. <br/>The results suggest that free volume sites can expand towards an equilibrium size, determined as the equilibrium Ps-bubble size defined earlier for low-molecular-weight liquids. The expansion can be explained by the increase of molecular mobility and hence decrease of relaxation times, which at the higher temperatures approach the o-Ps lifetimes. Nanoscale viscosities were estimated using Navier-Stokes equation and were found to be several orders of magnitude lower than the macroscopic viscosity at the same temperature. © 2012 American Institute of Physics.

AB - The possibility of positronium induced free volume cavity expansion in some polymers above the glass transition temperature was investigated using experimental positron annihilation lifetime data from the literature for polydimethylsiloxane, polyisobutylene, and polybutadiene as function of temperature. <br/>The results suggest that free volume sites can expand towards an equilibrium size, determined as the equilibrium Ps-bubble size defined earlier for low-molecular-weight liquids. The expansion can be explained by the increase of molecular mobility and hence decrease of relaxation times, which at the higher temperatures approach the o-Ps lifetimes. Nanoscale viscosities were estimated using Navier-Stokes equation and were found to be several orders of magnitude lower than the macroscopic viscosity at the same temperature. © 2012 American Institute of Physics.

U2 - 10.1063/1.4729561

DO - 10.1063/1.4729561

JO - Journal of Chemical Physics

JF - Journal of Chemical Physics

SN - 0021-9606

VL - 136

SP - 244902

ER -