Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
Surface modification of microphase-separated membranes by fluorine-containing polymer additive and removal of dilute benzene in water through these membranes
Autore:
Miyata, T; Yamada, H; Uragami, T;
Indirizzi:
Kansai Univ, Fac Engn, Unit Chem, Osaka 5648680, Japan Kansai Univ OsakaJapan 5648680 ac Engn, Unit Chem, Osaka 5648680, Japan Kansai Univ, High Technol Res Ctr, Osaka 5648680, Japan Kansai Univ Osaka Japan 5648680 gh Technol Res Ctr, Osaka 5648680, Japan
Titolo Testata:
MACROMOLECULES
fascicolo: 23, volume: 34, anno: 2001,
pagine: 8026 - 8033
SICI:
0024-9297(20011106)34:23<8026:SMOMMB>2.0.ZU;2-U
Fonte:
ISI
Lingua:
ENG
Soggetto:
AQUEOUS-ETHANOL SOLUTIONS; GRAFT COPOLYMER MEMBRANES; PENDANT MONOSACCHARIDES; FREE-ENERGY; PERVAPORATION; POLYSTYRENE; BLOCK; PERMSELECTIVITY; ORGANICS; MIXTURES;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
40
Recensione:
Indirizzi per estratti:
Indirizzo: Miyata, T Kansai Univ, Fac Engn, Unit Chem, Osaka 5648680, Japan Kansai Univ Osaka Japan 5648680 nit Chem, Osaka 5648680, Japan
Citazione:
T. Miyata et al., "Surface modification of microphase-separated membranes by fluorine-containing polymer additive and removal of dilute benzene in water through these membranes", MACROMOLEC, 34(23), 2001, pp. 8026-8033

Abstract

Hydrophobically surface-modified membranes were prepared by adding a fluorine-containing graft copolymer into a microphase-separated membrane consisting of poly(dimethylsiloxane) (PDMS) and poly(methyl methacrylate) (PMMA). This study focuses on the effects of surface characteristics and microphaseseparation of the surface-modified membranes on their permselectivity for a dilute aqueous solution of benzene in pervaporation. Contact angle measurements and X-ray photoelectron spectroscopy revealed that the addition of afluorine-containing copolymer produced a hydrophobic surface at the membrane air side due to its surface localization. It became apparent from transmission electron microscopy that adding a fluorine-containing copolymer of less than 1.2 wt % did not affect the morphology of the microphase-separatedmembrane, but adding the copolymer over 1.2 wt % resulted in a morphological change from a continuous PDMS phase to a discontinuous PDMS phase. The addition of a small amount of fluorine-containing copolymer into the microphase-separated membranes enhanced both the permeability and selectivity for a dilute aqueous solution of benzene in pervaporation because of their hydrophobic surfaces and microphase-separated structures. Specifically, the microphase-separated membrane containing 1.2 wt % of fluorine-containing copolymer concentrated from an aqueous solution of 0.05 wt % benzene to 70 wt % benzene and removed benzene in water very effectively. This paper also discusses the effect of the asymmetric surface structure of the hydrophobicallysurface-modified membranes on their permselectivity.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 21/09/20 alle ore 12:02:26