Wrinkled Adhesive Surfaces via Elastomer Swelling
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Solution Overview
Problem
Existing patterned adhesives face limitations in repeatable performance over multiple attachment/detachment cycles and inefficient, non-scalable fabrication approaches, restricting their commercial application.
Innovation Solution
A method involving the swelling of a laterally confined elastomer layer with a polymerizable monomer composition to form a wrinkled surface, which is then stabilized through polymerization, allowing for controlled adhesive properties and repeatable adhesion via manipulation of factors like elastomer layer thickness and adhesion energy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If top-down fabrication approaches (lithography, imprinting, soft lithography) are used to create fibrillar array-type patterned adhesives, then patterned adhesive surfaces can be formed, but the fabrication is inefficient and non-scalable
Solution Approach 1:
The patent inverts the conventional top-down fabrication approach by using a bottom-up self-assembly method. Instead of lithographically patterning adhesives, the invention uses spontaneous wrinkle formation in elastomer layers during swelling, allowing patterns to emerge naturally from material physics rather than being imposed by complex fabrication tools.
Solution Approach 2:
The elastomer layer performs self-patterning through autonomous wrinkle formation during the swelling process. The material itself generates the adhesive pattern without external intervention, using its inherent response to solvent absorption to create the desired surface morphology automatically.
2Reliability
If fibrillar array-type patterned adhesives are designed with specific diameter and aspect ratio, then adhesion can be tailored, but adhesive performance becomes non-repeatable over multiple attachment/detachment cycles
Solution Approach 1:
The patent changes the controlling parameters from fibril geometry (diameter, aspect ratio) to wrinkle characteristics (wavelength, amplitude, pattern periodicity). These wrinkle parameters can be precisely controlled by adjusting swelling conditions and elastomer properties, enabling both adhesion tailoring and repeatable performance across cycles.
Solution Approach 2:
The adhesive surface transitions from static fibrillar structures to dynamic wrinkle patterns that can reversibly flatten during attachment and recover during detachment. This dynamic behavior allows the surface to adapt its effective contact area and adhesion strength while maintaining structural integrity over multiple cycles.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method enables the rapid generation of patterned adhesive surfaces with enhanced, repeatable adhesion over multiple cycles and efficient, scalable production, suitable for various applications including pressure-sensitive adhesives and cosmetics.
Implementation Method 1
swelling a laterally confined elastomer layer with a polymerizable monomer composition
Implementation Method 2
polymerizing the polymerizable monomer composition to stabilize the wrinkled surface
Data Source
AI summary
A wrinkled adhesive surface is prepared by swelling a laterally confined elastomer layer with a polymerizable monomer composition. Swelling the elastomer layer spontaneously produces a wrinkled surface, and the wrinkles are then stabilized by polymerizing the polymerizable monomer composition. The stabilized wrinkled surfaces prepare by the method can exhibit substantially enhanced adhesion relative to smooth surfaces of the same material. The stabilized wrinkled surfaces can also exhibit adhesion that is repeatable through many cycles of contact with and separation from another surface. The adhesive characteristics of the stabilized wrinkled surfaces can be tailored by manipulating the size of the wrinkles.