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Titolo:
Aqueous solutions and gels of diblock copolymers of 1,2-butylene oxide andethylene oxide studied by light scattering and rheology
Autore:
Kelarakis, A; Havredaki, V; Viras, K; Mingvanish, W; Heatley, F; Booth, C; Mai, SM;
Indirizzi:
Natl & Kapodiztrian Univ Athens, Dept Chem, Phys Chem Lab, GR-15771 Athens, Greece Natl & Kapodiztrian Univ Athens Athens Greece GR-15771 71 Athens, Greece Univ Manchester, Dept Chem, Manchester M13 9PL, Lancs, England Univ Manchester Manchester Lancs England M13 9PL M13 9PL, Lancs, England Univ Sheffield, Dept Chem, Sheffield S3 7HF, S Yorkshire, England Univ Sheffield Sheffield S Yorkshire England S3 7HF S Yorkshire, England
Titolo Testata:
JOURNAL OF PHYSICAL CHEMISTRY B
fascicolo: 31, volume: 105, anno: 2001,
pagine: 7384 - 7393
SICI:
1520-6106(20010809)105:31<7384:ASAGOD>2.0.ZU;2-B
Fonte:
ISI
Lingua:
ENG
Soggetto:
ASSOCIATION PROPERTIES; TRIBLOCK COPOLYMERS; COPOLY(OXYETHYLENE OXYBUTYLENE); MICELLAR SOLUTIONS; PHASE-BEHAVIOR; BLOCK-LENGTH; HARD SPHERES; GELATION; MICELLIZATION; AGGREGATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
36
Recensione:
Indirizzi per estratti:
Indirizzo: Booth, C Natl & Kapodiztrian Univ Athens, Dept Chem, Phys Chem Lab, Panepistimiopolis, GR-15771 Athens, Greece Natl & Kapodiztrian Univ Athens Panepistimiopolis Athens Greece GR-15771
Citazione:
A. Kelarakis et al., "Aqueous solutions and gels of diblock copolymers of 1,2-butylene oxide andethylene oxide studied by light scattering and rheology", J PHYS CH B, 105(31), 2001, pp. 7384-7393

Abstract

Copolymers B20E430, B20E510, and B20E610 (B = oxybutylene repeat unit, E =oxyethylene repeat unit, subscripts indicate chain length in repeat units)were synthesized and characterized by gel permeation chromatography (for distribution width) and C-13 NMR spectroscopy (for absolute molar mass and composition). Dynamic and static light scattering were used to determine micellar properties in dilute aqueous solution: e.g., micelle association numbers and radii. A tube-inversion method was used to define the mobile-immobile (hard gel) phase boundary. For copolymer B20E610, immobile gels form at concentrations as low as 2.9 wt %. Rheological measurements of dynamic modulus and yield stress served to characterize the gel properties and to confirm the phase boundaries. The results are combined with those from previous work on related block copolymers to obtain scaling relationships for the dependence of micellar and gel properties on E-block length, thus enabling prediction of the requirements for and properties of very dilute aqueous gels. The validity of treating the micelles as hard spheres is discussed.

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Documento generato il 09/12/19 alle ore 03:40:42