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Pressure effects revealed by small angle neutron scattering on block copolymer gels

Castelletto, V., Newby, G. E., Hamley, I. W., Noirez, L. and Baroni, P. (2008) Pressure effects revealed by small angle neutron scattering on block copolymer gels. Langmuir, 24 (15). pp. 8319-8324. ISSN 0743-7463

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To link to this article DOI: 10.1021/la801025n

Abstract/Summary

We study the effects of hydrostatic pressure (P) on aqueous solutions and gels of the block copolymer B20E610 (E, oxyethylene; B, oxybutylene; subscripts, number of repeats), by performing simultaneous small angle neutron scattering/pressure experiments. Micellar cubic gels were studied for 9.5 and 4.5 wt% B20E610 at T = 20-80 and 35-55 degrees C, respectively, while micellar isotropic solutions where Studied for 4.5 wt% B20E610 at T > 55 degrees C. We observed that the interplanar distance d(110) (cubic unit cell parameter a = root 2d(110)) decreases while the correlation length of the Cubic order (delta) increases, upon increasing P at a fixed T for 9.5 wt% B20E610. The construction of master Curves for d(110) and delta corresponding to 9.5 wt% B20E610 proved the correlation between changes in T and P. Neither d(110) and delta nor the cubic-isotropic phase transition temperature was affected by the applied pressure for 4.5 wt% B20E610. The dramatic contrast between the pressure-induced behavior observed for 9.5 and 4.5 wt% B20E610 suggests that pressure induced effects might be more effectively transmitted through samples that present wider domains of cubic structure order (9.5 wt% compared to 4.5 wt% B20E610).

Item Type:Article
Refereed:Yes
Divisions:Faculty of Life Sciences > School of Chemistry, Food and Pharmacy > Department of Chemistry
ID Code:11104
Uncontrolled Keywords:BICONTINUOUS CUBIC PHASES, X-RAY-DIFFRACTION, DIBLOCK COPOLYMERS, HOMOPOLYMER BLENDS, DEPENDENCE, TEMPERATURE, MICELLES, TRANSITIONS, MESOPHASES, MIXTURES

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