Effect of supercritical carbon dioxide on nanoporous polyhexafluoropropylene


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Abstract

The effect of supercritical CO2 (sc-CO2) on the size distribution of free volume holes (nanopores) in a polyhexafluoropropylene (PHFP) polymer matrix has been studied. Residual (after CO2 release) swelling improves gas transport properties of the material. Relaxation of these properties over time has been compared with changes in permeability and nanoporosity. For PHFP samples with different histories, the data on nanoporosity have been obtained using positron annihilation lifetime spectroscopy (micropores) and the lowtemperature gas sorption technique (mesopores and part of micropores). Matching of the data is intended to reveal the role of pores of different sizes in permeability of membrane materials to different gases and determine the specifics of application of the positron annihilation technique to studying sc-CO2-modified objects.

About the authors

V. P. Shantarovich

Semenov Institute of Chemical Physics

Author for correspondence.
Email: shant@center.chph.ras.ru
Russian Federation, ul. Kosygina 4, Moscow, 119991

V. G. Bekeshev

Semenov Institute of Chemical Physics

Email: shant@center.chph.ras.ru
Russian Federation, ul. Kosygina 4, Moscow, 119991

N. A. Belov

Topchiev Institute of Petrochemical Synthesis

Email: shant@center.chph.ras.ru
Russian Federation, Leninskii pr. 29, Moscow, 119991

I. A. Ronova

Nesmeyanov Institute of Organoelement Compounds

Email: shant@center.chph.ras.ru
Russian Federation, ul. Vavilova 28, Moscow, 119334

A. Yu. Nikolaev

Nesmeyanov Institute of Organoelement Compounds

Email: shant@center.chph.ras.ru
Russian Federation, ul. Vavilova 28, Moscow, 119334

V. W. Gustov

Semenov Institute of Chemical Physics

Email: shant@center.chph.ras.ru
Russian Federation, ul. Kosygina 4, Moscow, 119991

I. B. Kevdina

Semenov Institute of Chemical Physics

Email: shant@center.chph.ras.ru
Russian Federation, ul. Kosygina 4, Moscow, 119991

M. K. Filimonov

Semenov Institute of Chemical Physics

Email: shant@center.chph.ras.ru
Russian Federation, ul. Kosygina 4, Moscow, 119991

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