On the Limits of Sensitivity of PALS to Incorporated  Free Volume Holes in Polymeric Membranes and Sorbents:  Effect of sc-CO2 in Polyhexafluoropropelene

Авторы: Shantarovich V., Bekeshev V., Belov N., Kevdina I., Filimonov M., Ronova I., Nikolaev A.
Сборник: Defect and Diffusion Forum
Том: 373
Тезисы
Год издания: 2016
Место издания: Trans Tech Publications Switzerland
Первая страница: 261
Последняя страница: 264
DOI: 10.4028/www.scientific.net/DDF.373.261
Аннотация: Positron annihilation lifetime spectroscopy (PALS) is a recognized method for the studies of size-distribution of nano-pores (intrinsic free volume holes FVH) in polymers, particularly membrane materials. The limits of this application in the case of “alien” pores, produced on residual swelling of poly(hexafluoro propylene) PHFP by the gas (CO2) in supercritical (sc-) state are discussed. The obtained conclusions are controlled by measurements of low temperature gas (N2) sorption (LTGS) and by comparison of the data with the results on permeation of various gases through the PHFP membrane. Attention is payed to relaxation with time of the newly created FVH in the PHFP membrane.
Добавил в систему: Белов Николай Александрович

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