Zobrazeno 1 - 10
of 13
pro vyhledávání: '"V. L. Vyazovkin"'
Publikováno v:
Macromolecules. 54:10059-10067
Although the diffusion of small molecules in amorphous polymers attracts much attention due to a variety of applications of polymer materials, little is known about the mechanism of diffusion. In t...
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1670ba27502e9aa504e162b273fec462
https://doi.org/10.1021/acs.macromol.1c01183
https://doi.org/10.1021/acs.macromol.1c01183
Publikováno v:
Journal of Polymer Science Part B: Polymer Physics. 57:1097-1104
The diffusion of small molecules through amorphous polymers proceeds by the thermally activated jumps whose rate changes from one region to another due to polymer heterogeneity. Little is known at present about the origin of diffusion heterogeneity.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::64c0ff55a9bc4f2ffe77da80e5081fc2
https://doi.org/10.1002/polb.24864
https://doi.org/10.1002/polb.24864
Publikováno v:
Journal of Polymer Science Part B: Polymer Physics. 56:288-296
Although gas sorption in glassy polymers is a well-studied phenomenon, no general microscopical model is developed which is able to describe the gas sorption in a wide temperature range using only characteristics of polymer and gas molecule. In this
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8a60efd80457e8bc94deef2e81a6a3c9
https://doi.org/10.1002/polb.24540
https://doi.org/10.1002/polb.24540
Publikováno v:
Journal of Non-Crystalline Solids. 357:2115-2119
Oxygen translational mobility is very sensitive to structural heterogeneities in molecular glass formers. The heterogeneities manifest themselves as the regions, within which the oxygen jump rates have either the same or similar values. The length of
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b59af21355860ade1917879f26d1146f
https://doi.org/10.1016/j.jnoncrysol.2011.02.010
https://doi.org/10.1016/j.jnoncrysol.2011.02.010
Autor:
V. M. Syutkin, V. L. Vyazovkin
Publikováno v:
Polymer Science Series A. 48:192-197
In poly(methyl methacrylate) films, the kinetics of the oxidation of polymeric radicals and azobenzenenitrenes with molecular oxygen dissolved in the polymer is studied. The free radicals are produced at 77 K by irradiating the polymer with UV light,
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6ddaf8c61538f9adab67c7248c9bee4a
https://doi.org/10.1134/s0965545x06020143
https://doi.org/10.1134/s0965545x06020143
Publikováno v:
Reaction Kinetics and Catalysis Letters. 77:293-299
ESR spectroscopy has been used to follow the kinetics of decay of radicals produced by UV-radiation in PMMA films upon exposure to oxygen in the temperature range 160-210 K. In the same films and at the same conditions, decay kinetics of phenanthrene
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4ffb3cfb1d5268edfd63ac9a32647025
https://doi.org/10.1023/a:1020883818258
https://doi.org/10.1023/a:1020883818258
Publikováno v:
Physical Review Letters. 109
Deactivation of excited phenanthrene by molecular oxygen is utilized to probe the structural heterogeneity of supercooled propylene carbonate. The diffusion rate of oxygen molecules in different regions varies over two orders of magnitude. The size o
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ea014518b0ef0ce94c1f87919fa59ca1
https://doi.org/10.1103/physrevlett.109.137801
https://doi.org/10.1103/physrevlett.109.137801
Publikováno v:
Chemical Physics. 170:427-436
The kinetic data on the simplest reactions occurring at low temperatures in solids are considered. All reactions are stimulated by molecular motions whose frequency substantially exceeds that of the diffusion displacements of particles. In all of the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d13cc6ddda2ef7841f2031092a9eec1e
https://doi.org/10.1016/0301-0104(93)85123-p
https://doi.org/10.1016/0301-0104(93)85123-p
Publikováno v:
The Journal of chemical physics. 133(7)
A new method using the quenching of guest molecule phosphorescence by molecular oxygen is proposed for determination of heterogeneity size in glassy matrixes. The method is based on the high sensitivity of the diffusion of oxygen molecules to spatial
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::17960d7db3e717078f99dbc8fa690f20
https://pubmed.ncbi.nlm.nih.gov/20726646
https://pubmed.ncbi.nlm.nih.gov/20726646
Publikováno v:
The Journal of Chemical Physics. 135:244504
The kinetics of azobenzene nitrene oxidation by molecular oxygen dissolved in a matrix was studied in glassy propylene carbonate. The reaction was carried out in excess oxygen within its concentration range 0.008 to 0.048 M. The oxidation kinetics, c
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c32e9e05e09e5f20585a6a830a8fdfcb
https://doi.org/10.1063/1.3671637
https://doi.org/10.1063/1.3671637