Collapse of entangled polymer brushes under shear
We have investigated a polystyrene brush grafted on a 7x7cm silicon slab, immersed in a free polystyrene solution and have measured the thickness of the brush by neutron reflectometry, as a function of an applied shear flow. Under shear, the brush stretches, which is entropically unfavourable and the chains prefer to collapse which reduces the interpenetration with the free flowing chains thus reducing drag force and the resulting sideways stretching.
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KOROLKOVAS Airidas; CHENNEVIERE Alexis; GUTFREUND Philipp; RODRIGUEZ EMMENEGGER Cesar and WOLFF Maximilian. (2016). Collapse of entangled polymer brushes under shear. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.9-11-1784
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