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Titolo:
Synthesis, transport, and sorption properties and free volume of polystyrene derivatives containing Si and F
Autore:
Khotimskii, VS; Filippova, VG; Bryantseva, IS; Bondar, VI; Shantarovich, VP; Yampolskii, YP;
Indirizzi:
Russian Acad Sci, AV Topchiev Petrochem Synth Inst, Moscow 117912, Russia Russian Acad Sci Moscow Russia 117912 Synth Inst, Moscow 117912, Russia 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 Russian Acad Sci, NN Semenov Chem Phys Inst, Moscow 117334, Russia RussianAcad Sci Moscow Russia 117334 m Phys Inst, Moscow 117334, Russia
Titolo Testata:
JOURNAL OF APPLIED POLYMER SCIENCE
fascicolo: 9, volume: 78, anno: 2000,
pagine: 1612 - 1620
SICI:
0021-8995(20001128)78:9<1612:STASPA>2.0.ZU;2-7
Fonte:
ISI
Lingua:
ENG
Soggetto:
OLIGODIMETHYLSILOXANYL SUBSTITUENTS; TEMPERATURE-DEPENDENCE; POSITRON-ANNIHILATION; PERMEABILITY; POLYNORBORNENES; PERMEATION; MEMBRANES; LIFETIME; POLYMERS;
Keywords:
gas permeability; sorption isotherms; positron annihilation; glassy polymers;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
22
Recensione:
Indirizzi per estratti:
Indirizzo: Yampolskii, YP Russian Acad Sci, AV Topchiev Petrochem Synth Inst, 29 Leninsky Pr, Moscow117912, Russia Russian Acad Sci 29 Leninsky Pr Moscow Russia 117912 ussia
Citazione:
V.S. Khotimskii et al., "Synthesis, transport, and sorption properties and free volume of polystyrene derivatives containing Si and F", J APPL POLY, 78(9), 2000, pp. 1612-1620

Abstract

Gas permeation, sorption, and free volume was studied in a series of glassy vinylic type Si-containing polymers. They included p-substituted derivatives of polystyrene, which were compared with polystyrene, and poly(vinylphenyldimethyl silane). The strongest increase in permeability and diffusion coefficients were observed for the polymer containing the SI(CH3)(3) group directly attached to phenylene ring. An introduction of spacers between phenylene ring and Si(CPI3)(3) group results in much lower gas permeability. Positron annihilation study of free volume in these polymers showed that lifetime spectra are composed of four components. It implies that size distribution of free volume in these polymers, which are characterized by a modest level of gas permeability, is bimodal, a feature previously observed only for extra large free volume and permeability materials such as poly(trimethylsilyl propyne). (C) 2000 John Wiley & Sons, Inc.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 02/07/20 alle ore 22:01:07