Adhesion at Poly(Butylacrylate)–Poly(Dimethylsiloxane) Interfaces

Abstract

We present an investigation of the adhesion modulation mechanisms of silica-like nanoparticles (MQ resins) incorporated in polydimethylsiloxane (PDMS) elastomers and acrylic adhesives. The Johnson-Kendall-Roberts (JKR) test has been used to gain information on the both zero velocity and the velocity dependence of the adhesive strength, avoiding as much as possible contributions to the adhesive strength of bulk dissipation in the adhesive (which is not the case with peel tests). As the incorporation of the MQ resins into the elastomers deeply affects their own mechanical properties, the loading and unloading curves of small poly(butylacrylate) (PBA) lenses on either PDMS elastomers, adsorbed PDMS and pure MQ resin layers are compared in a systematic manner. The PBA chains are observed to have a neat affinity for the MQ resin nanoparticles. When MQ resins are present at the interface, they tend to prevent facture propagation, thus producing a larger deformation of the PBA lens. The modulation of adhesion is then dominated by the corresponding dissipation inside the acrylic adhesive.

Silicone‐Based Adhesives with Highly Tunable Adhesion Force for Skin‐Contact Applications

“…To minimize the influence of the solvent (octamethyltrisiloxane, boiling point 153 °C), the MQ resin containing PDMS was cured at 155 °C for 2 h. In all cases, the Young's moduli of the V‐PDMS/H‐PDMS mixtures were increased by increasing the ratio of the MQ resin. Similar results have been reported previously . It has also been noted that in the case of polymer‐filler hybrid systems, the modulus of the polymers was increased by strong interactions between the polymers and filler .…”

From elasticity to capillarity in soft materials indentation

“…Johnson, Kendall, and Roberts demonstrated that even under zero external load, a gain of interfacial energy in the contact zone establishes a finite contact area between two rubber spheres. Since then, the JKR theory has become a staple in characterizing mechanical properties and adhesion of soft materials [10][11][12][13][14][15][16][17][18][19][20][21][22][23].…”