Conductive Composite Film With Reactive Layer for Stretchable Bonding
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Solution Overview
Problem
Existing conductive composite materials with silicone elastomers suffer from poor bonding between the conductive layer and the silicone elastomer, leading to inadequate performance in flexibility and stretching ability.
Innovation Solution
A conductive composite film comprising a substrate, a silicone-based reactive layer formed from a curable organosiloxane composition, at least one conductive layer, and a silicone encapsulant layer, where the reactive layer is formed by curing an organosiloxane composition, and the conductive layer is applied on the reactive layer followed by a silicone encapsulant.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a silicone elastomer is used as a substrate for a conductive layer, then flexibility and stretching ability are improved, but bonding strength between the conductive layer and silicone elastomer deteriorates
Solution Approach 1:
A silicone-based reactive layer is introduced as an intermediary between the silicone elastomer substrate and the conductive layer. This reactive layer contains silane groups that can chemically bond to both the silicone elastomer and the conductive layer, creating strong interfacial adhesion while maintaining the flexibility and stretching ability of the silicone elastomer substrate.
Solution Approach 2:
The invention creates a composite structure consisting of multiple layers: silicone elastomer substrate, silicone-based reactive layer, and conductive layer. This composite material approach allows each layer to contribute its specific properties - the silicone elastomer provides flexibility and stretching, while the reactive layer provides bonding, and the conductive layer provides electrical conductivity.
2Adaptability or versatility
If a polymeric substrate is used for flexible conductive films, then flexibility is improved, but bonding strength with conductive layer deteriorates
Solution Approach 1:
The silicone-based reactive layer serves as a mediator between the polymeric substrate and the conductive layer. The reactive layer's silane groups can form chemical bonds with both the polymeric substrate and the conductive layer, ensuring strong bonding while preserving the flexibility provided by the polymeric substrate.
3Ease of manufacture
If conductive fillers are applied by wet-coating process, then ease of manufacture is improved, but high-temperature drying or sintering is required which may affect flexible substrates
Solution Approach 1:
The invention changes the curing parameters of the conductive layer formation process. Instead of requiring high-temperature drying or sintering, the conductive layer is cured at lower temperatures through chemical reactions of the silane groups in the reactive layer, making the process suitable for flexible substrates that cannot withstand high temperatures.
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 composite film exhibits enhanced flexibility and stretching ability, with reduced resistance variation during cyclic stretching, making it suitable for wearable and electronic device applications.
Implementation Method 1
a silicone based reactive layer formed from a curable organosiloxane composition
Implementation Method 2
the interface between the conductive layer and the silicone elastomer does not bond strongly
Implementation Method 3
a conductive layer containing a conductive filler
Data Source
AI summary
A conductive composite film has four layers: (A) a substrate, (B) a silicone based reactive layer, (C) at least one conductive layer and (D) a silicone encapsulant layer, and the silicone based reactive layer is formed from curable organosiloxane composition.