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Local Wear of Catechol-Containing Diblock Copolymer Layers: Wear Volume, Stick-Slip, and Nanomechanical Changes
Luleå University of Technology, Sweden.ORCID-id: 0000-0001-6877-9282
Vilnius University, Lithuania.
Luleå University of Technology, Sweden; Institute for Basic Science, South Korea.
Vilnius University, Lithuania.
Vise andre og tillknytning
2021 (engelsk)Inngår i: The Journal of Physical Chemistry C, ISSN 1932-7447, E-ISSN 1932-7455, Vol. 125, nr 38, s. 21277-21292Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Polymers containing catechol groups have gained a large interest, as they mimic an essential feature of mussel adhesive proteins that allow strong binding to a large variety of surfaces under water. This feature has made this class of polymers interesting for surface modification purposes, as layer functionalities can be introduced by a simple adsorption process, where the catechol groups should provide a strong anchoring to the surface. In this work, we utilize an AFM-based method to evaluate the wear resistance of such polymer layers in water and compare it with that offered by electrostatically driven adsorption. We pay particular attention to two block copolymer systems where the anchoring group in one case is an uncharged catechol-containing block and in the other case a positively charged and catechol-containing block. The wear resistance is evaluated in terms of wear volume, and here, we compare with data for similar copolymers with statistical distribution of the catechol groups. Monitoring of nanomechanical properties provides an alternative way of illustrating the effect of wear, and we use modeling to show that the stiffness, as probed by an AFM tip, of the soft layer residing on a hard substrate increases as the thickness of the layer decreases. The stick-slip characteristics are also evaluated. © 2021 The Authors. 

sted, utgiver, år, opplag, sider
American Chemical Society , 2021. Vol. 125, nr 38, s. 21277-21292
Emneord [en]
Adhesives, Block copolymers, Phenols, Slip forming, Wear of materials, Wear resistance, As layers, Diblock-copolymer, Essential features, Local wears, Mussel adhesive proteins, Nanomechanical, Strong binding, Surface-modification, Under water, Wear volume, Stick-slip
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Identifikatorer
URN: urn:nbn:se:ri:diva-56927DOI: 10.1021/acs.jpcc.1c06859Scopus ID: 2-s2.0-85116679792OAI: oai:DiVA.org:ri-56927DiVA, id: diva2:1613292
Merknad

 Funding details: National Natural Science Foundation of China, NSFC, 21902098; Funding text 1: X.L. acknowledges financial support from the National Natural Science Foundation of China (NSFC) (21902098).

Tilgjengelig fra: 2021-11-22 Laget: 2021-11-22 Sist oppdatert: 2023-03-30bibliografisk kontrollert

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