Microporosity of Polynorbornenes by Positron Annihilation and Sorption Data

Autor:	Maxim V. Bermeshev, I.B. Kevdina, V. G. Bekeshev, Alyona I. Wozniak, Victor P. Shantarovich
Rok vydání:	2021
Předmět:	010302 applied physics 010304 chemical physics Chemistry Monte Carlo method Substituent Thermodynamics Sorption 01 natural sciences Positronium chemistry.chemical_compound Positron 0103 physical sciences Atom Density functional theory Physical and Theoretical Chemistry Porosity
Zdroj:	High Energy Chemistry. 55:80-87
ISSN:	1608-3148 0018-1439
Popis:	Based on positron annihilation and low-temperature gas (CO2) sorption data, we discuss the nature of size distribution of micropores in a number of polynorbornenes with various substituent groups in the side chain. The local stiffness of highly permeable glassy polymers suggests that they are microheterogeneous. In this case, distributions that are bimodal in nature seem quite possible, although unimodal cases cannot be excluded either. The positron annihilation data are consistent with these concepts and correlate with permeability. At the same time, the positron and sorption data on porosity are found to have discrepancies, which are explained either by limited mobility of the positronium atom or by inaccuracy of description of the sorption curve according to the density functional theory (NLDFT) and the Monte Carlo method (GCMC).
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::837c93af21898c7bba8deb47473ec878 https://doi.org/10.1134/s0018143921010112 Zobrazit plný text záznamu Plný text ve formátu PDF Plný text ve formátu HTML
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