Polyimide Surface Treatment via Covalent Resin Bonding
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Solution Overview
Problem
Existing methods for making polyimide surfaces hydrophilic or hydrophobic, such as those involving ozone treatment, pose safety risks due to the use of flammable materials and toxic ozone, and may result in unstable surface modifications.
Innovation Solution
A surface treatment method involving the covalent bonding of a first resin with primary and secondary amino groups, and a second resin with (meth)acryloyl and hydrophilic or hydrophobic groups, to create a stable and safe hydrophilic or hydrophobic surface on polyimide materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If polyamic acid is heated to high temperature (200°C or more) in an ozone atmosphere to make polyimide hydrophilic, then the surface becomes hydrophilic, but fire or explosion may occur and ozone toxicity poses safety risks
Solution Approach 1:
The invention extracts and eliminates the harmful elements (ozone atmosphere and high temperature heating) from the surface treatment process. Instead, it uses a two-liquid method at room temperature that achieves hydrophilic modification without fire risk or toxic gas exposure, directly removing the dangerous components while preserving the desired functional outcome.
Solution Approach 2:
The invention changes the fundamental parameters of the treatment process: temperature is reduced from 200°C or more to room temperature, and the chemical environment is changed from ozone atmosphere to aqueous/organic liquid phases. These parameter changes eliminate the fire hazard and toxicity while maintaining the ability to create hydrophilic surfaces through covalent bonding of amino-functionalized silane and acrylic acid.
2Stability of the object's composition
If conventional surface treatment methods are used, then hydrophilic or hydrophobic properties can be achieved, but the surface modifications may be unstable and deteriorate over time
Solution Approach 1:
The invention replaces physical adsorption or weak bonding mechanisms with covalent bonding mechanisms. The amino-functionalized silane forms strong covalent bonds with the polyimide surface, and acrylic acid subsequently bonds to the silane, creating a stable crosslinked network that resists deterioration over time, thereby substituting weak physical interactions with strong chemical bonds.
Solution Approach 2:
The invention creates a composite surface structure consisting of three components: the polyimide substrate, the amino-functionalized silane layer, and the acrylic acid layer. This multi-layer composite structure with covalent bonding between layers provides enhanced stability and durability compared to single-layer treatments, as each layer reinforces the others and the covalent bonds prevent delamination or degradation.
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 effectively renders polyimide surfaces hydrophilic or hydrophobic while ensuring safe operation, with the surface treatments being stable and resistant to deterioration over time.
Implementation Method 1
covalently bonding first resin to the surface including polyimide of the treatment target
Implementation Method 2
covalently bonding second resin to the first resin
Data Source
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AI summary
To provide a surface treatment method capable of successfully making a treatment target including polyimide on a surface thereof hydrophilic or hydrophobic with a safe operation; a two-liquid type surface treatment liquid that can be suitably used for the surface treatment method; and a surface-treated polyimide product that can be obtained by the above-described surface treatment method. A first resin having a primary amino group and/or a hydroxyl group, and a secondary amino group is bonded to a surface of a treatment target including polyimide on a surface thereof, and then a second resin having a (meth)acryloyl group and/or a carbamoyl group, a hydrophilic group and/or a hydrophobic group is bonded to the first resin.