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Self-restoring polymer brushes under tribological stress and the biomedical applications

Published online by Cambridge University Press:  16 May 2016

Troels Røn ,
Irakli Javakhishvili ,
Søren Hvilsted ,
Katja Jankova  and
Seunghwan Lee
Troels Røn
Affiliation:
Department of Mechanical Engineering, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark
Irakli Javakhishvili
Affiliation:
Danish Polymer Centre, Department of Chemical and Biochemical Engineering, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark
Søren Hvilsted
Affiliation:
Danish Polymer Centre, Department of Chemical and Biochemical Engineering, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark
Katja Jankova
Affiliation:
Danish Polymer Centre, Department of Chemical and Biochemical Engineering, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark
Seunghwan Lee*
Affiliation:
Department of Mechanical Engineering, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark
*
*(Email: [email protected])
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Abstract

For biological and mechanical systems involving moving parts, surface slipperiness is often a critical attribute for their optimal functions. Surface grafting with hydrophilic polymers is a powerful means to render materials slippery in aqueous environment. In “inverted grafting-to approach”, the hydrophilic polymer chains of amphiphilic diblock copolymers dispersed within a poly(dimethylsiloxane) (PDMS) network are selectively segregated upon exposure to aqueous solution. This allows formation of extremely stable brush-like polymer layers. Tribological application of inverted grafting-to approach was successfully demonstrated with PDMS-block-poly(acrylic acid) (PDMS-b-PAA) dispersed within thin PDMS films on PDMS blocks by showing friction coefficients (µ) of ca 10-2 to 10-3, depending on the load, pH and buffer salinity in the absence of other external re-supply of PAA chains. Further manipulations of the thin PDMS film incorporating PDMS-b-PAA to optimize the tribological properties are presented. Lastly, first trials to employ PAA-grafted PDMS surface to generate in-vitro mucosae model are also presented and discussed.

Keywords

polymersurface chemistrybiomedical
Type
Articles
Information
MRS Advances , Volume 1 , Issue 27: Biomaterials and Soft Materials , 2016 , pp. 1971 - 1976
Copyright
Copyright © Materials Research Society 2016 

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References

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