Patterned Film With Cleavable Crosslinker
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Solution Overview
Problem
Existing patterned adhesive technologies lack the ability to create films with tailored mechanical and adhesive properties through differential crosslink density, which limits their application in various industrial uses.
Innovation Solution
A patterned film article is developed using a crosslinked copolymer with regions of high and low crosslink density, achieved by selectively irradiating a composition containing a cleavable crosslinking monomer and a photoacid or thermal acid generator, allowing for tailored mechanical and adhesive properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a uniform crosslinked adhesive film is used, then the film has consistent mechanical strength, but it lacks tailored adhesive properties for different applications
Solution Approach 1:
The patent applies local quality by creating regions of high crosslink density and low crosslink density within the same adhesive film. The high crosslink density regions provide mechanical strength and structural integrity, while the low crosslink density regions provide enhanced adhesive properties. This spatial variation in crosslink density allows the film to simultaneously exhibit both strong mechanical properties and tailored adhesive characteristics for different substrates and applications.
2Adaptability or versatility
If selective irradiation is applied to create patterned regions, then films with tailored properties are achieved, but the manufacturing process becomes more complex
Solution Approach 1:
The patent employs preliminary action by incorporating a photoacid generator into the adhesive composition before irradiation. This allows the chemical components to be pre-positioned and ready for selective activation. When irradiated, the photoacid generator rapidly produces acid that catalyzes crosslinking or cleavage reactions in the illuminated regions, creating the desired patterned structure. This pre-positioning of reactive components simplifies the overall manufacturing process compared to methods requiring multiple coating or treatment steps.
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 solution enables the creation of films with anisotropic properties, allowing for adjustable peel adhesion, storage modulus, and tensile properties, enhancing their suitability for specific applications.
Implementation Method 1
Those irradiated regions photolyze the photoacid generator, releasing incipient acid, which catalyze the cleavage of a portion of the crosslinks.
Implementation Method 2
Heated regions thermolyze the TAG, releasing incipient acid, which catalyzed the cleavage of a portion of the crosslinks.
Data Source
AI summary
A pattern article comprising a copolymer having polymerized units derived from a cleavable crosslinking monomer, to which a pattern is imparted by the release of incipient acid from a thermal acid generator or photoacid generator. The selective release of the acid provides a pattern of high crosslink density and low crosslink density as result of the incipient acid cleaving a portion of the crosslinks.