Add time:07/17/2019         Source:sciencedirect.com

The creation of micrometer adhesive pads by dewetting and subsequent crosslinking of a benzophenone-acrylate copolymer onto a substrate that is lithographically patterned with a benzophenone-fluoropolymer, has been investigated in relation to the adhesive performance of either continuous or patterned adhesive interlayers. First, the intrinsic adhesive properties of a n-butyl acrylate methacryloyl-4-oxy-benzophenone copolymer were investigated as a function of composition (4, 10, 20 mol-% benzophenone), concentration (1–5 mg/ml) and photochemical cross-linking conditions (1–120 min). Under optimized conditions, the benzophenone-acrylate provides a good balance of adhesive strength and ductility at low concentrations of photo-reactive groups and performs better than reference adhesives. The latter can be understood by the formation of a dense polymer network with different degree of crosslinking resulting in high stiffness. Second, the benzophenone-acrylate was successfully confined into adhesive pads through spontaneous flow and pinning of the contact line of the liquid adhesive at the hydrophobic/hydrophilic interface of chemically patterned substrates, followed by dimensional stabilization of the droplet shape through partial crosslinking. The adhesive strength of interfaces with discrete adhesive pads (diameter 2000 to 500 μm) is significantly higher than continuous adhesive interlayers and is confirmed by cohesive failure of the adhesive.

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