Switchable adhesion and friction by stimulus responsive polymer brushes

Yunlong Yu

Research output: ThesisPhD Thesis - Research UT, graduation UTAcademic

360 Downloads (Pure)

Abstract

Controlling friction and adhesion is relevant in nature and in our daily life. Such control can be achieved using stimulus responsive end-anchored polymers forming a brush. These brushes can adapt their physicochemical properties upon changing the surrounding environments, such as temperature, light, pH, electrical and magnetic fields. In this Thesis, we primarily use atomic force microscopy (AFM) to study the relation between the degree of solvation of the macromolecules in the brush and the friction and adhesion. In general, it is accepted that collapsed brushes promote high friction/adhesion and swollen brushes exhibit low friction/adhesion. However, our results show that brush swelling and adhesion/friction is not necessarily related. We show that the relation between swelling of a brush and its tribomechanical properties is rather complex, and that it can depend on the specific interactions in the contact: chemically identical/different brush-brush or brush-solid counter surface. Switchable adhesion and friction we observed by stimulus-responsive polymer brushes have potential applications in pick up-release system, robots and in biomedical systems.
Original languageEnglish
Awarding Institution
  • University of Twente
Supervisors/Advisors
  • Vancso, Gyula J., Supervisor
  • de Beer, Sissi, Advisor
Award date11 Jan 2017
Place of PublicationEnschede
Publisher
Print ISBNs978-90-365-4280-7
DOIs
Publication statusPublished - 11 Jan 2017

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brushes
stimuli
adhesion
friction
polymers
swelling
theses
robots
macromolecules
solvation
counters
atomic force microscopy

Keywords

  • IR-102669
  • METIS-319785

Cite this

Yu, Yunlong. / Switchable adhesion and friction by stimulus responsive polymer brushes. Enschede : Universiteit Twente, 2017. 146 p.
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Switchable adhesion and friction by stimulus responsive polymer brushes. / Yu, Yunlong.

Enschede : Universiteit Twente, 2017. 146 p.

Research output: ThesisPhD Thesis - Research UT, graduation UTAcademic

TY - THES

T1 - Switchable adhesion and friction by stimulus responsive polymer brushes

AU - Yu, Yunlong

PY - 2017/1/11

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N2 - Controlling friction and adhesion is relevant in nature and in our daily life. Such control can be achieved using stimulus responsive end-anchored polymers forming a brush. These brushes can adapt their physicochemical properties upon changing the surrounding environments, such as temperature, light, pH, electrical and magnetic fields. In this Thesis, we primarily use atomic force microscopy (AFM) to study the relation between the degree of solvation of the macromolecules in the brush and the friction and adhesion. In general, it is accepted that collapsed brushes promote high friction/adhesion and swollen brushes exhibit low friction/adhesion. However, our results show that brush swelling and adhesion/friction is not necessarily related. We show that the relation between swelling of a brush and its tribomechanical properties is rather complex, and that it can depend on the specific interactions in the contact: chemically identical/different brush-brush or brush-solid counter surface. Switchable adhesion and friction we observed by stimulus-responsive polymer brushes have potential applications in pick up-release system, robots and in biomedical systems.

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