000112626 001__ 112626
000112626 005__ 20181203020948.0
000112626 0247_ $$2doi$$a10.1002/(SICI)1099-0488(19980130)36:2<383::AID-POLB16>3.0.CO;2-D
000112626 037__ $$aARTICLE
000112626 245__ $$aIon transport across membranes prepared by gel crystallization
000112626 269__ $$a1998
000112626 260__ $$c1998
000112626 336__ $$aJournal Articles
000112626 500__ $$a08876266 (ISSN), Cited By (since 1996): 3, Export Date: 25 September 2007, Source: Scopus, CODEN: JPBPE
000112626 520__ $$aA one-step procedure for the preparation of ion-selective membranes is described. The method employs the thermally induced gel crystallization of ultrahigh molecular weight poly(ethylene) (UHMW-PE) from a dilute xylene solution. After evaporation of the xylene, a microporous UHMW-PE film remains, which can serve as the support for liquid and polymeric ion-selective membranes. The addition of a membrane solvent and suitable receptor molecules to the xylene solution allows a one-step incorporation of these membrane components into the UHMW-PE support. The influence of the preparation conditions of the UHMW-PE support on the rates of the p-tert-butylcalix[4]arene tetraethylester-mediated transport of NaClO4 was studied. Two concepts to improve the life-time of the membranes are introduced. In a first approach, the addition of photocrosslinkable nitril-substituted siloxane copolymers to the membrane phase has been evaluated. The enhanced viscosity of the membrane phase reduces leaching of carrier and solvent molecules from the membrane into the aqueous phases. In a second approach, the solvent is omitted and the membrane-phase merely consists of a benzo-15-crown-5 or calix[4]arene modified siloxane-copolymer, which is substituted to such a degree that ion transport no longer has to take place via diffusion of host-guest complexes but by jumping of the cations from one fixed carrier to a neighboring carrier. © 1998 John Wiley & Sons, Inc.
000112626 6531_ $$aCalixarenes
000112626 6531_ $$aCrown-ethers
000112626 6531_ $$aGel crystallization
000112626 6531_ $$aIon-selective membranes
000112626 6531_ $$aPoly(siloxanes)
000112626 6531_ $$aCopolymers
000112626 6531_ $$aCrown ethers
000112626 6531_ $$aCrystallization
000112626 6531_ $$aIon selective membranes
000112626 6531_ $$aLeaching
000112626 6531_ $$aSolvents
000112626 6531_ $$aUltrahigh molecular weight polyethylenes
000112626 6531_ $$aViscosity
000112626 6531_ $$aCalixarenes
000112626 6531_ $$aGel crystallization
000112626 6531_ $$aIon transport
000112626 6531_ $$aSilicones
000112626 700__ $$0240029$$aKlok, H.-A.$$g156848
000112626 700__ $$aEibeck, P.
000112626 700__ $$aGankema, H.
000112626 700__ $$aNieuwhof, R. P.
000112626 700__ $$aMöller, M.
000112626 700__ $$aReinhoudt, D. N.
000112626 773__ $$j36$$k2$$q383-394$$tJournal of Polymer Science, Part B: Polymer Physics
000112626 909C0 $$0252017$$pLP$$xU10342
000112626 909CO $$ooai:infoscience.tind.io:112626$$pSTI$$particle
000112626 917Z8 $$x127405
000112626 937__ $$aLP-ARTICLE-1998-003
000112626 973__ $$aEPFL$$rNON-REVIEWED$$sPUBLISHED
000112626 980__ $$aARTICLE