Features of the Gas-Permeable Crystalline Phase of Poly-2,6-dimethylphenylene Oxide

Poly-2,6-dimethylphenylene oxide (PPO) film samples with varying degrees of crystallinity (from 0 to 69%) were obtained by means of different techniques. The films were studied by various physicochemical methods (Fourier-transform infrared spectroscopy, positron annihilation lifetime spectroscopy, X...

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Published inPolymers Vol. 14; no. 1; p. 120
Main Authors Alentiev, Alexander Yu, Levin, Ivan S, Belov, Nikolay A, Nikiforov, Roman Yu, Chirkov, Sergey V, Bezgin, Denis A, Ryzhikh, Victoria E, Kostina, Julia V, Shantarovich, Victor P, Grunin, Leonid Yu
Format Journal Article
LanguageEnglish
Published Switzerland MDPI AG 29.12.2021
MDPI
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Summary:Poly-2,6-dimethylphenylene oxide (PPO) film samples with varying degrees of crystallinity (from 0 to 69%) were obtained by means of different techniques. The films were studied by various physicochemical methods (Fourier-transform infrared spectroscopy, positron annihilation lifetime spectroscopy, X-ray diffraction, and H nuclear magnetic resonance relaxation). Solubility coefficients of gases in the PPO samples were measured via sorption isotherms of gases by volumetric technique with chromatographic detection. The apparent activation energy of permeation and the activation energy of diffusion of all gases were estimated based on temperature dependences of gas permeability and diffusivity for amorphous and semi-crystalline PPO in the range of 20-50 °C. The peculiarities of free volume, density, and thermal properties of gas transport confirm the nanoporosity of the gas-permeable crystalline phase of PPO. So, the PPO can be included in the group of organic molecular sieves.
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ISSN:2073-4360
2073-4360
DOI:10.3390/polym14010120