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Comments on the Effect ofγ-Irradiation on Positronium Formation in Polymers at Low Temperatures

100%

Shantarovich V., Hirade T., Kevdina I., Gustov V., Oleinik E.

Acta Physica Polonica A

2001

vol. 99

issue 3-4

497-501

Quantitative description of the effect of γ-irradiation of PE and PMMA on positronium formation on the trapped electrons at low temperatures is suggested. The consideration shows that, at least in these substances, the number of the trapping centers is probably enough to localize all ortho-positronium, and therefore the intensity of the long-lived positronium component is dependent mostly on the probability of Ps formation but not on the number of the trapping centers.

Some Aspects of Free Volume Studies in Molecular Substances Using Positron Annihilation Experiments

86%

Shantarovich V., Suzuki T., Djourelov N., Shimazu A., Gustov V., Kevdina I.

Acta Physica Polonica A

2005

vol. 107

issue 4

629-634

Positron annihilation lifetime spectroscopy is accepted now as a method for the studies of elementary free volumes (free volume holes) in solids, in polymers in particular. The aim of this paper is to discuss some problems, the difficulties on the way of this application and to illustrate them by several examples obtained by the authors.

Local Rigidity as a Criterion of Gas Permeation of Polymer and Composition Materials; PAL and TSL Experiments

73%

Shantarovich V., Gustov V., Belousova E., Polyakova A., Bekeshev V., Kevdina I., Yampolskii Y., Pastukhov A.

Acta Physica Polonica A

2014

vol. 125

issue 3

806-811

Various commercial and industrial properties of polymeric materials can be developed by the way of purposeful synthesis. For example, there are polymeric materials of extremely developed intrinsic microporosity. In attempts to further develop membrane properties (permeability and selectivity), the researchers artificially increase the pore sizes by various external influences, such as plastification by saturation of polymers with gases, sometimes in supercritical state, filling of a polymer with some non-organic components (zeolites). Sometimes, porosity of the composition appears to become higher than that of the components. This porosity, in difference with intrinsic one, can be called externally affected. The reason of these phenomena is not always clear, and in order to get some ideas in this field we suggest an experimental study using a combination of the two genetically interconnected (by spur processes) methods: positron annihilation lifetime spectroscopy and thermostimulated luminescence. This paper summarizes recently published and completely new results of the authors in order to illustrate the benefits of this experimental approach.

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3 Acta Physica Polonica A

1 2014

1 2005

1 2001

3 Gustov V.

3 Kevdina I.

3 Shantarovich V.

1 Bekeshev V.

1 Belousova E.

1 Djourelov N.

1 Hirade T.

1 Oleinik E.

1 Pastukhov A.

1 Polyakova A.

1 Shimazu A.

1 Suzuki T.

1 Yampolskii Y.

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Comments on the Effect ofγ-Irradiation on Positronium Formation in Polymers at Low Temperatures

Some Aspects of Free Volume Studies in Molecular Substances Using Positron Annihilation Experiments

Local Rigidity as a Criterion of Gas Permeation of Polymer and Composition Materials; PAL and TSL Experiments