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

Newby, Gemma E.; Watkins, Erik Benjamin; Merino, Daniel Hermida; Staniec, Paul A.; Bikondoa, Oier

doi:10.1039/C5RA20215A

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

Journal Article · Mon Nov 30 23:00:00 EST 2015 · RSC Advances

DOI:https://doi.org/10.1039/C5RA20215A· OSTI ID:1512759

Newby, Gemma E. ^[1]; ^[2]; Merino, Daniel Hermida ^[3]; Staniec, Paul A. ^[4]; Bikondoa, Oier ^[5]

ESRF-The European Synchrotron, Grenoble Cedex (France)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States); ILL-Institut Laue-Langevin, Grenoble (France)
ESRF-The European Sychrotron, Grenoble (France); Dutch Polymer Inst. DPI, Eindhoven (The Netherlands)
Diamond Light Source Ltd., Didcot (United Kingdom)
ESRF-The European Synchrotron, Grenoble Cedex (France); Univ. of Warwick, Coventry (United Kingdom)

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. Here, 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.

View Accepted Manuscript (DOE)

Research Organization:: Los Alamos National Laboratory (LANL)

Sponsoring Organization:: Universities/Institutions; USDOE

Grant/Contract Number:: 89233218CNA000001

OSTI ID:: 1512759

Report Number(s):: LA-UR-17-21847

Journal Information:: RSC Advances, Journal Name: RSC Advances Journal Issue: 126 Vol. 5; ISSN 2046-2069; ISSN RSCACL

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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