The Temperature and Pressure Dependence of the Free Volume in Fluoroelastomers from PALS and PVT Experiments

• Authors: G. Dlubek , A. Sen Gupta , J. Wawryszczuk , D. Kilburn , J. Pionteck , R. Krause-Rehberg , T. Goworek , M. Alam , H. Kaspar , K. Lochhaas
• Languages of publication: EN

Abstracts

EN

Positron lifetime and pressure-volume-temperature experiments were performed as function of T (100-485 K) and P (10^{-5} Pa-500 MPa) on a fluoroelastomer. From positron annihilation lifetime spectroscopy, analyzed with LT9.0 assuming a dispersion in the e^+ (τ_2) and o-Ps (τ_3) lifetime, the mean, 〈v_h〉, and the width (standard deviation), σ_h, of the hole size distribution were calculated. The pressure-volume-temperature data were analyzed using the Simha-Somcynsky hole-lattice theory to estimate the specific hole free volume V_f. From a comparison of V_f with 〈v_h〉 the specific hole number, N'_h, is estimated. The data from thermal expansion and pressure experiments show complete agreement when taking into account the compressibility of the occupied volume.

Keywords

EN

61.41.+e   78.70.-g  

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2005
• Volume: 107
• Issue: 4
• Pages: 685-689

Dates

published

2005-04

received

2004-09-20

References

• 1. L.A. Utracki, R. Simha, Macromol. Theory Simul., 10, 17, 2001
• 2. G. Dlubek, J. Pionteck, D. Kilburn, Macromol. Chem. Phys., 205, 500, 512, 2004
• 3. G. Dlubek, A. Sen Gupta, J. Pionteck, R. Krause-Rehberg, H. Kaspar, K.H. Lochhaas, Macromolecules, 37, 6606, 2004
• 4. G. Dlubek, J. Wawryszczuk, J. Pionteck, T. Goworek, H. Kaspar, K.H. Lochhaas, Macromolecules, in press
• 5. J. Kansy, Nucl. Instrum. Methods Phys. Res. A, 374, 235, 1996 and private communication, 2002
• 6. Principles and Application of Positron and Positronium Chemistry, Eds. Y.C. Jean, P.E. Mallon, D.M. Schrader, World Scientific, Singapore 2003

Identifiers

DOI

10.12693/APhysPolA.107.685