Free volume dilatation in polymers by ortho-positronium

P. Winberg; Morten Mostgaard Eldrup; F.H.J. Maurer

doi:10.1063/1.4729561

Free volume dilatation in polymers by ortho-positronium

P. Winberg
, Morten Mostgaard Eldrup
, F.H.J. Maurer

Lund University

Research output: Contribution to journal › Journal article › Research › peer-review

1034 Downloads (Orbit)

Abstract

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.
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.

Original language	English
Journal	Journal of Chemical Physics
Volume	136
Pages (from-to)	244902
Number of pages	7
ISSN	0021-9606
DOIs	https://doi.org/10.1063/1.4729561
Publication status	Published - 2012

Bibliographical 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

Access to Document

10.1063/1.4729561

Free volume dilatationFinal published version, 644 KB

OpenUrl availability

Check availability in DTU Findit

Cite this

@article{5012d185682f4c07ba2a968e9446cc58,

title = "Free volume dilatation in polymers by ortho-positronium",

abstract = "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. 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. {\textcopyright} 2012 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",

language = "English",

volume = "136",

pages = "244902",

journal = "Journal of Chemical Physics",

issn = "0021-9606",

publisher = "American Institute of Physics",

}

TY - JOUR

T1 - Free volume dilatation in polymers by ortho-positronium

AU - Winberg, P.

AU - Eldrup, Morten Mostgaard

AU - Maurer, F.H.J.

N1 - 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

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. 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. 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

M3 - Journal article

C2 - 22755598

SN - 0021-9606

VL - 136

SP - 244902

JO - Journal of Chemical Physics

JF - Journal of Chemical Physics

ER -

Free volume dilatation in polymers by ortho-positronium

Abstract

Bibliographical note

Access to Document

OpenUrl availability

Fingerprint

Cite this