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

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Dlubek G., Sen Gupta A., Wawryszczuk J., Kilburn D., Pionteck J., Krause-Rehberg R., Goworek T., Alam M., Kaspar H., Lochhaas K.

Acta Physica Polonica A

2005

vol. 107

issue 4

685-689

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.

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1 Acta Physica Polonica A

1 2005

1 Alam M.

1 Dlubek G.

1 Goworek T.

1 Kaspar H.

1 Kilburn D.

1 Krause-Rehberg R.

1 Lochhaas K.

1 Pionteck J.

1 Sen Gupta A.

1 Wawryszczuk J.

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