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Synthesis of Programmable Main-chain Liquid-crystalline Elastomers Using a Two-stage Thiol-acrylate Reaction

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Published on: January 19, 2016

Dangling chain elastomers as repeatable fibrillar adhesives.

Metin Sitti¹, Brian Cusick, Burak Aksak

¹Department of Mechanical Engineering, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA.

ACS Applied Materials & Interfaces

|April 2, 2010

Summary

This summary is machine-generated.

Researchers developed new repeatable adhesive materials by grafting polymer chains onto elastomers. These gecko-inspired adhesives show significantly enhanced adhesion, offering a novel platform for high-strength materials.

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Area of Science:

Polymer Science
Materials Science
Adhesion Science

Background:

Developing advanced adhesive materials with enhanced performance is crucial for various technological applications.
Mimicking natural adhesion mechanisms, such as those found in gecko feet, offers a promising route to novel adhesive designs.

Purpose of the Study:

To create repeatable adhesive materials by controlled grafting of dangling hetero chains from polymer elastomers.
To investigate the effects of chain length and fibrillar structuring on adhesion mechanics.
To explore a novel fabrication platform for high-strength, gecko-inspired adhesives.

Main Methods:

Grafting poly(n-butyl acrylate) (PBA) chains from polydimethylsiloxane (PDMS) elastomer networks using atom transfer radical polymerization.
Incorporating PBA chains of varying lengths (DP 65–1200) into PDMS matrices.
Fabricating fibrillar elastomer structures with grafted PBA chains using a dip-transfer method.

Main Results:

PBA chains with a DP of 281 grafted from a flat PDMS substrate enhanced adhesion by approximately 3.5-fold.
PBA chain-covered micropillar arrays showed macroscale adhesion enhancement up to approximately 7 times compared to control substrates.
Fibrillar structuring and mushroom-shaped tips contributed an additional 2-fold adhesion enhancement.

Conclusions:

Controlled grafting of dangling hetero chains from polymer elastomers can create repeatable and high-strength adhesives.
The developed materials demonstrate significant adhesion enhancement through both chemical modification and micro/nanofibrillar structuring.
This work presents a novel fabrication platform for gecko-inspired adhesives with potential for multilength scale applications.