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In situ Rheo-GISANS of triblock copolymers: gelation and shear effects on quasi-crystalline structures at interfaces

DOI: 10.1039/C5RA20215A DOI Help

Authors: Gemma Newby (ESRF) , Erik Watkins (Los Alamos National Laboratory) , Daniel Hermida-merino (University of Reading; DUBBLE CRG BM26 ESRF) , Paul Staniec (Diamond Light Source) , Oier Bikondoa (ESRF)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Rsc Advances , VOL 5 , PAGES 104164 - 104171

State: Published (Approved)
Published: December 2015

Abstract: The behaviour of polymeric systems at surfaces and under flow is extremely important in many applications, ranging from drug delivery to lubrication. We have studied a model triblock copolymer in deuterated water combining in situ rheology and grazing incidence small angle neutron scattering. Several thermotropic phases appear as a function of the temperature, including a bicontinuous phase not present in the bulk. Moreover, gelation can occur following a different route depending on the concentration. We show that shearing can be used to monitor the structural integrity of the micellar systems and in some cases as a tool for modifying the thermotropic phases: an fcc (face centred cubic) phase is sheared into a hcp (hexagonally close packed) phase, and is then recovered by cycling the temperature.

Subject Areas: Materials

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Added On: 17/12/2015 16:56

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