Elevated temperature adhesion of bioinspired polymeric micropatterns to glass

Viktoriia Barreau; Dan Yu; René Hensel; Eduard Arzt

doi:10.1016/j.jmbbm.2017.04.007

Elevated temperature adhesion of bioinspired polymeric micropatterns to glass

J Mech Behav Biomed Mater. 2017 Dec:76:110-118. doi: 10.1016/j.jmbbm.2017.04.007. Epub 2017 Apr 7.

Authors

Viktoriia Barreau¹, Dan Yu², René Hensel², Eduard Arzt³

Affiliations

¹ INM - Leibniz Institute for New Materials, Campus D2 2, 66123 Saarbrücken, Germany; Department of Materials Science and Engineering, Saarland University, 66123 Saarbrücken, Germany.
² INM - Leibniz Institute for New Materials, Campus D2 2, 66123 Saarbrücken, Germany.
³ INM - Leibniz Institute for New Materials, Campus D2 2, 66123 Saarbrücken, Germany; Department of Materials Science and Engineering, Saarland University, 66123 Saarbrücken, Germany. Electronic address: eduard.arzt@leibniz-inm.de.

PMID: 28411957
DOI: 10.1016/j.jmbbm.2017.04.007

Abstract

Micropatterned polymer surfaces that operate at various temperatures are required for emerging technical applications such as handling of objects or space debris. As the mechanical properties of polymers can vary significantly with temperature, adhesion performance can exhibit large variability. In the present paper, we experimentally study temperature effects on the adhesion of micropatterned adhesives (pillar length 20µm, aspect ratios 0.4 and 2) made from three different polymers, i.e., polydimethylsiloxane (PDMS), perfluoropolyether dimethacrylate (PFPEdma), and polyurethane (PU-ht). PU specimens showed the highest pull-off stresses of about 57kPa at 60°C, i.e., more than twice the value of unpatterned control samples. The work of separation similarly showed a maximum at that temperature, which was identified as the glass transition temperature, T_g. PDMS and PFPEdma specimens were tested above their T_g. As a result, the adhesion properties decreased monotonically (about 50% for both materials) for temperature elevation from 20 to 120°C. Overall, the results obtained in our study indicate that the operating temperature related to the glass transition temperature should be considered as a significant parameter for assessing the adhesion performance of micropatterned adhesives and in the technical design of adhesion devices.

Keywords: Adhesion; Glass transition temperature; Micropatterning; Viscoelasticity.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Biomimetic Materials / chemistry*
Glass / chemistry*
Materials Testing
Mechanical Phenomena
Polymers / chemistry*
Surface Properties
Transition Temperature*

Substances

Polymers