About Some Peculiarities of Positron Annihilation and Sorption Methods in Microporosity Studies on Polymers

V. P. Shantarovich; Шантарович В. П.; V. G. Bekeshev; Бекешев В. Г.; I. B. Kevdina; Кевдина И. Б.; V. V. Gustov; Густов В. В.; E. V. Belousova; Белоусова Э. В.

doi:10.31857/S0023119323040137

About Some Peculiarities of Positron Annihilation and Sorption Methods in Microporosity Studies on Polymers

Autores: Shantarovich V.P.¹, Bekeshev V.G.¹, Kevdina I.B.¹, Gustov V.V.¹, Belousova E.V.¹
Afiliações:
1. Semenov Research Center for Chemical Physics, Russian Academy of Sciences
Edição: Volume 57, Nº 4 (2023)
Páginas: 260-266
Seção: GENERAL QUESTIONS
URL: https://vestnikugrasu.org/0023-1193/article/view/661486
DOI: https://doi.org/10.31857/S0023119323040137
EDN: https://elibrary.ru/QOBJRE
ID: 661486

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Resumo

Data on microporosity (micropore size distribution) in the range from several angstroms to several nanometers, obtained by measuring the positron annihilation lifetime (PALS method) and by measuring CO2 sorption (low-temperature gas sorption, LTGS) are collated for a number of polymers with amorphous (polyetherimides, PEI) and semicrystalline (polyphenylene oxides, PPO) structures. The microporosity estimates based on the positron annihilation and CO2 sorption data are compared with published data obtained both
experimentally and by the group contribution method for the permeability of these materials. The discrepancies found and their possible causes are discussed.

Palavras-chave

positron, positronium, annihilation, localization time, nanopore, free volume, specific surface area, permeability, adsorption, size distribution, Doppler broadening, annihilation line

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