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Titolo:
Study of high permeability polymers by means of the spin probe technique
Autore:
Yampolskii, YP; Motyakin, MV; Wasserman, AM; Masuda, T; Teraguchi, M; Khotimskii, VS; Freeman, BD;
Indirizzi:
Russian Acad Sci, AV Topchiev Petrochem Synth Inst, Moscow 117912, Russia Russian Acad Sci Moscow Russia 117912 Synth Inst, Moscow 117912, Russia Russian Acad Sci, NN Semenov Chem Phys Inst, Moscow 117977, Russia RussianAcad Sci Moscow Russia 117977 m Phys Inst, Moscow 117977, Russia Kyoto Univ, Dept Polymer Chem, Grad Sch Engn, Kyoto 60601, Japan Kyoto Univ Kyoto Japan 60601 mer Chem, Grad Sch Engn, Kyoto 60601, Japan N Carolina State Univ, Dept Chem Engn, Raleigh, NC 27695 USA N Carolina State Univ Raleigh NC USA 27695 em Engn, Raleigh, NC 27695 USA
Titolo Testata:
POLYMER
fascicolo: 7, volume: 40, anno: 1999,
pagine: 1745 - 1752
SICI:
0032-3861(199903)40:7<1745:SOHPPB>2.0.ZU;2-X
Fonte:
ISI
Lingua:
ENG
Soggetto:
GAS-PERMEABILITY; FREE-VOLUME; SORPTION; POLYMERIZATION; SUBSTITUENTS; NORBORNENE; DIFFUSION;
Keywords:
high permeability polymers; spin probe technique; glassy polymers;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
25
Recensione:
Indirizzi per estratti:
Indirizzo: Yampolskii, YP Russianoscow Sci, AV Topchiev Petrochem Synth Inst, 29 Leninsky Prospect, M Russian Acad Sci 29 Leninsky Prospect Moscow Russia 117912
Citazione:
Y.P. Yampolskii et al., "Study of high permeability polymers by means of the spin probe technique", POLYMER, 40(7), 1999, pp. 1745-1752

Abstract

The spin probe technique was systematically applied to study a family of high permeability and high free volume glassy polymers. Rotation correlationtimes tau(c) Or frequencies nu = 1/tau(c) of 2,2,6,6-tetramethylpyperidine-1-oxyl (TEMPO) were measured in amorphous teflons - random copolymers of tetrafluoroethylene and 2,2-bistrifluoromethyle-4,5-difluoro-1,3-dioxole, polyacetylenes and polynorbornenes. Polymers distinguished by unusually high,for the glassy state, permeability and free volume exhibit large rotational mobility of TEMPO. The correlation times correspond to fast rotation of the spin probe previously observed only in rubbery polymers, Correlations between the frequency nu and gas permeability and diffusion coefficients wereobserved. However, in some polymers, the spin probe's rotation rate is also sensitive to side-chain local mobility, which does not affect translational diffusion coefficients of gas molecules in polymers. (C) 1999 Elsevier Science Ltd. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 12/07/20 alle ore 02:08:11