Effect of supercritical carbon dioxide on nanoporous polyhexafluoropropylene

被引：17
|
作者：
Shantarovich, V. P. [1 ]
Bekeshev, V. G. [1 ]
Belov, N. A. [2 ]
Ronova, I. A. [3 ]
Nikolaev, A. Yu. [3 ]
Gustov, V. W. [1 ]
Kevdina, I. B. [1 ]
Filimonov, M. K. [1 ]
机构：
[1] Russian Acad Sci, Semenov Inst Chem Phys, Ul Kosygina 4, Moscow 119991, Russia
[2] Russian Acad Sci, Topchiev Inst Petrochem Synth, Leninskii Pr 29, Moscow 119991, Russia
[3] Russian Acad Sci, Nesmeyanov Inst Organoelement Cpds, Ul Vavilova 28, Moscow 119334, Russia
来源：
HIGH ENERGY CHEMISTRY | 2016年 / 50卷 / 04期
关键词：
ANNIHILATION LIFETIME SPECTROSCOPY; FREE-VOLUME; POSITRON-ANNIHILATION; MICROPORES;
D O I：
10.1134/S0018143916040160
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
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.
引用
收藏
页码：287 / 291
页数：5
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