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Titolo:
Solubilization of alkylcyanobiphenyls in aqueous micellar solutions of a diblock copolymer of propylene oxide and ethylene oxide
Autore:
Yang, Z; Pousia, E; Heatley, F; Price, C; Booth, C; Castelletto, V; Hamley, IW;
Indirizzi:
Univ Manchester, Dept Chem, Manchester M13 9PL, Lancs, England Univ Manchester Manchester Lancs England M13 9PL M13 9PL, Lancs, England Univ Leeds, Sch Chem, Leeds LS2 9JT, W Yorkshire, England Univ Leeds Leeds W Yorkshire England LS2 9JT S2 9JT, W Yorkshire, England
Titolo Testata:
LANGMUIR
fascicolo: 7, volume: 17, anno: 2001,
pagine: 2106 - 2111
SICI:
0743-7463(20010403)17:7<2106:SOAIAM>2.0.ZU;2-U
Fonte:
ISI
Lingua:
ENG
Soggetto:
BLOCK ARCHITECTURE; ASSOCIATION PROPERTIES; TRIBLOCK COPOLYMERS; MICELLIZATION; GELATION; THERMODYNAMICS; SPECTROSCOPY; LENGTH; GELS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
32
Recensione:
Indirizzi per estratti:
Indirizzo: Yang, Z Univ Manchester, Dept Chem, Manchester M13 9PL, Lancs, England Univ Manchester Manchester Lancs England M13 9PL , Lancs, England
Citazione:
Z. Yang et al., "Solubilization of alkylcyanobiphenyls in aqueous micellar solutions of a diblock copolymer of propylene oxide and ethylene oxide", LANGMUIR, 17(7), 2001, pp. 2106-2111

Abstract

A diblock copolymer of propylene oxide and ethylene oxide, denoted Py4E316, was prepared by sequential anionic polymerization of the two monomers. C-13 NMR spectroscopy was used to obtain the absolute number-average molar mass and overall composition (whence the molecular formula), and gel permeation chromatography was used to confirm a narrow chain-length distribution. Anumber of techniques (light scattering, dye solubilization with DPH (1,6-diphenyl-1,3,5-hexatriene), surface tension) were used to confirm micellization in dilute aqueous solution and to determine the temperature dependence of the critical micelle concentration. Light scattering was also used to determine the temperature dependence of micellar association number and radius. Copolymer solutions of concentration 10 and 20 g dm(-3) copolymer were used to solubilize a nematic liquid crystal mixture with a wide nematic range, coded BL002. The extent of solubilization in the temperature range 20-40degreesC could be correlated with the extent of micellization of the copolymer, leading to an upper limit at 40 degreesC of ca. 50 mg (g of copolymer)(-1), i.e., 180 mg (g of hydrophobe)(-1). It was noted that BL002 solubilization could be adapted to provide a method for determining the critical micelle temperatures of aqueous solutions of the copolymer.

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Documento generato il 01/04/20 alle ore 20:58:59