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
Subjects
Activation energy
Crystal structure
Crystallinity
Fourier transforms
free volume
gas permeability
gas sorption
Gas transport
Gases
Infrared spectroscopy
Lifetime
Magnetic induction
Molecular sieves
NMR
Nuclear magnetic resonance
Organic chemistry
organic molecular sieves
Permeability
poly-2,6-dimethylphenylene oxide
Polymer films
Polymers
Positron annihilation
semi-crystalline polymers
Spectrum analysis
Thermodynamic properties
Russia
poly-2,6-dimethylphenylene oxide
free volume
gas permeability
organic molecular sieves
semi-crystalline polymers
gas sorption
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Abstract 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.
AbstractList 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 1 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.
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.
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 1H 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.
Author Kostina, Julia V
Levin, Ivan S
Nikiforov, Roman Yu
Belov, Nikolay A
Ryzhikh, Victoria E
Grunin, Leonid Yu
Alentiev, Alexander Yu
Shantarovich, Victor P
Bezgin, Denis A
Chirkov, Sergey V
AuthorAffiliation 2 N.N. Semenov Federal Research Center For Chemical Physics RAS, 119991 Moscow, Russia; shant@center.chph.ras.ru
1 A.V. Topchiev Institute of Petrochemical Synthesis RAS, 119991 Moscow, Russia; levin@ips.ac.ru (I.S.L.); belov@ips.ac.ru (N.A.B.); nru@ips.ac.ru (R.Y.N.); sm1th@ips.ac.ru (S.V.C.); bezgin@ips.ac.ru (D.A.B.); kochenkova@ips.ac.ru (V.E.R.); julia@ips.ac.ru (J.V.K.)
3 Department of Physics, Volga State University of Technology, 424000 Yoshkar-Ola, Russia; GruninLY@volgatech.net
AuthorAffiliation_xml – name: 3 Department of Physics, Volga State University of Technology, 424000 Yoshkar-Ola, Russia; GruninLY@volgatech.net
– name: 1 A.V. Topchiev Institute of Petrochemical Synthesis RAS, 119991 Moscow, Russia; levin@ips.ac.ru (I.S.L.); belov@ips.ac.ru (N.A.B.); nru@ips.ac.ru (R.Y.N.); sm1th@ips.ac.ru (S.V.C.); bezgin@ips.ac.ru (D.A.B.); kochenkova@ips.ac.ru (V.E.R.); julia@ips.ac.ru (J.V.K.)
– name: 2 N.N. Semenov Federal Research Center For Chemical Physics RAS, 119991 Moscow, Russia; shant@center.chph.ras.ru
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BackLink https://www.ncbi.nlm.nih.gov/pubmed/35012142$$D View this record in MEDLINE/PubMed
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Issue 1
Keywords poly-2,6-dimethylphenylene oxide
free volume
gas permeability
organic molecular sieves
semi-crystalline polymers
gas sorption
Language English
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Snippet 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...
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StartPage 120
SubjectTerms Activation energy
Crystal structure
Crystallinity
Fourier transforms
free volume
gas permeability
gas sorption
Gas transport
Gases
Infrared spectroscopy
Lifetime
Magnetic induction
Molecular sieves
NMR
Nuclear magnetic resonance
Organic chemistry
organic molecular sieves
Permeability
poly-2,6-dimethylphenylene oxide
Polymer films
Polymers
Positron annihilation
semi-crystalline polymers
Spectrum analysis
Thermodynamic properties
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Title Features of the Gas-Permeable Crystalline Phase of Poly-2,6-dimethylphenylene Oxide
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