Discontinuous Conductive Layer for Adhesion-Conductivity Trade-off
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Solution Overview
Problem
Conductive polymeric materials face challenges in achieving balanced electrical conductivity and adhesion properties, with existing solutions often compromising between the two, and exhibiting inconsistent electrical characteristics due to random alignment of conductive particles.
Innovation Solution
A composite with a dielectric material layer and a discontinuous or patterned conductive layer that aligns conductive particles to form consistent conductive paths, allowing for electronic coupling while maintaining exposed areas for adhesion, achieved through electrophoresis or dielectrophoresis and application of a conductive layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conductive particles are added to provide good electrical conductivity, then electrical conductivity is improved, but adhesion strength and flexibility deteriorate
Solution Approach 1:
The conductive layer is segmented into a discontinuous pattern rather than a continuous layer, creating multiple isolated conductive regions. This segmentation allows the conductive particles to provide electrical pathways while leaving gaps that permit polymer flow and adhesive bonding to substrates, thus resolving the contradiction between conductivity and adhesion strength
Solution Approach 2:
Different regions of the adhesive composite are assigned different functions: discontinuous conductive regions provide electrical conductivity while the surrounding polymer-rich regions provide adhesion and flexibility. This local differentiation allows each region to optimize its specific function without compromising the other
2Reliability
If particle concentration is high enough to form a conductive network, then electrical conductivity is improved, but polymer concentration decreases leading to poor surface contact and adhesion
Solution Approach 1:
The conductive particles are segmented into discrete regions rather than forming a continuous high-concentration network. This segmentation allows sufficient polymer concentration to exist in the gaps between particle regions, enabling the polymer to flow out and make proper surface contact with substrates while still maintaining electrical conductivity through the particle regions
3Strength
If PSA component concentration is sufficient to make surface contact, then adhesion is improved, but conductive particle contact is disrupted
Solution Approach 1:
The conductive particles are arranged in segmented, isolated regions rather than requiring continuous particle-to-particle contact throughout the entire adhesive layer. This segmentation allows the PSA component to flow and make surface contact in the gaps between particle regions without disrupting the conductive pathways, as each segmented region maintains its own particle contact network independently
4Ease of manufacture
If conductive particles are randomly dispersed, then manufacturing is simple, but electrical characteristics are inconsistent
Solution Approach 1:
Conductive particles are preliminarily arranged into specific patterns or configurations before the adhesive is applied or cured. This preliminary arrangement ensures consistent electrical characteristics while maintaining manufacturing simplicity, as the particle pattern is established in advance rather than relying on random dispersion
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 provides consistent electrical conductivity and improved adhesion properties, ensuring compliance with biomedical electrode standards by aligning conductive paths and enhancing the probability of contact between electrodes.
Implementation Method 1
The conductive particles are aligned to form a plurality of conductive paths from the first side to the second side of the dielectric material
Implementation Method 2
achieved through electrophoresis or dielectrophoresis
Implementation Method 3
the discontinuous layer facilitates the electronic coupling together of a plurality of the conductive paths
Data Source
AI summary
An electrically conductive composite is disclosed that includes a dielectric material having a first side and a second side, conductive particles within the dielectric material layer, and a discontinuous layer of a conductive material on a first side of the dielectric layer. The conductive particles are aligned to form a plurality of conductive paths from the first side to the second side of the dielectric material, and each of the conductive paths is formed of at least a plurality of conductive particles. The discontinuous layer includes a plurality of non-mutually connected portions that cover portions of, but not all of, the first side of the dielectric material such that exposed portions of the underlying first side of the dielectric material remain exposed through the discontinuous layer, yet the discontinuous layer facilitates the electronic coupling together of a plurality of the conductive paths from the first side to the second side of the dielectric material.