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

Pressure effects revealed by small angle neutron scattering on block copolymer gels. Research Abstract Details 

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Pressure effects revealed by small angle neutron scattering on block copolymer gels. Abstract Text:

We study the effects of hydrostatic pressure ( P) on aqueous solutions and gels of the block copolymer B 20E 610 (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 % B 20E 610 at T = 20-80 and 35-55 degrees C, respectively, while micellar isotropic solutions where studied for 4.5 wt % B 20E 610 at T > 55 degrees C. We observed that the interplanar distance d 110 (cubic unit cell parameter a = radical2 d 110) decreases while the correlation length of the cubic order (delta) increases, upon increasing P at a fixed T for 9.5 wt % B 20E 610. The construction of master curves for d 110 and delta corresponding to 9.5 wt % B 20E 610 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 % B 20E 610. The dramatic contrast between the pressure-induced behavior observed for 9.5 and 4.5 wt % B 20E 610 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 % B 20E 610).

Pressure effects revealed by small angle neutron scattering on block copolymer gels. Publishing Authors By Initials

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Pressure effects revealed by small angle neutron scattering on block copolymer gels. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: Langmuir : the ACS journal of surfaces and colloid

VOLUME: 24

Page Numbers: 8319-24

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ISSN: 0743-7463

DAY: 20

MONTH: 06

YEAR: 2008

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

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LANGUAGE: eng

NlmUniqueID: 9882736

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Grant and Affiliation Information for Pressure effects revealed by small angle neutron scattering on block copolymer gels.

AFFILIATION: V.Castelletto@reading.ac.uk.

Country: United States

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MEDLINETA: Langmuir

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