Polymer brush collapse under shear flow

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389013%3A_____%2F17%3A00471012" target="_blank" >RIV/61389013:_____/17:00471012 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.1021/acs.macromol.6b02525" target="_blank" >http://dx.doi.org/10.1021/acs.macromol.6b02525</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1021/acs.macromol.6b02525" target="_blank" >10.1021/acs.macromol.6b02525</a>

Result language
angličtina
Original language name
Polymer brush collapse under shear flow
Original language description
Shear responsive surfaces offer potential advances in a number of applications. Surface functionalization using polymer brushes is one route to such properties, particularly in the case of entangled polymers. We report on neutron reflectometry measurements of polymer brushes in entangled polymer solutions performed under controlled shear as well as coarse-grained computer simulations corresponding to these interfaces. Here we show a reversible and reproducible collapse of the brushes, increasing with the shear rate. Using two brushes of greatly different chain lengths and grafting densities, we demonstrate that the dynamics responsible for the structural change of the brush are governed by the free chains in solution rather than the brush itself, within the range of parameters examined. The phenomenon of the brush collapse could find applications in the tailoring of nanosensors and as a way to dynamically control surface friction and adhesion.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10404 - Polymer science

Project
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2017
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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