Conductive Silicone Composition With Stable High Filler Loading
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Solution Overview
Problem
Developing electrically conductive siloxane materials is challenging due to issues such as filler separation, adverse effects on curing kinetics, and variable contact resistance, particularly at higher filler loadings.
Innovation Solution
A curable silicone composition comprising a polymer A, a catalyst, and one or more fillers, where polymer A includes siloxane or hybrid siloxane molecules, allowing for high filler loadings without separation and maintaining curing and processing conditions, with optional polymer B as a cross-linker.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If filler loading is increased to achieve desired conductivity, then electrical conductivity is improved, but filler particles separate out from the composition over time
Solution Approach 1:
The patent introduces a silane-modified polymer as an intermediary substance that mediates between the filler particles and the silicone matrix. This modifier creates compatibilization at the interface, allowing high filler loadings to be maintained without separation. The silane-modified polymer acts as a bridge that improves adhesion between the inorganic filler and organic silicone matrix, preventing filler aggregation and settlement over time.
Solution Approach 2:
The patent changes the chemical parameters of the polymer by introducing silane modification. This chemical modification alters the surface properties and reactivity of the polymer, enabling it to interact more effectively with both the filler particles and the silicone matrix. The silane groups can undergo condensation reactions that create strong chemical bonds, transforming the physical mixture into a chemically bonded composite structure that resists separation.
2Reliability
If filler loading is increased to achieve desired conductivity, then electrical conductivity is improved, but curing kinetics are adversely affected
Solution Approach 1:
The silane-modified polymer serves as a mediator that facilitates the curing process even at high filler loadings. The silane groups in the modifier can participate in the crosslinking reaction, providing additional reaction sites that compensate for the filler particles that would otherwise physically hinder catalyst access to the polymer chains. This intermediary substance maintains curing kinetics by creating alternative reaction pathways.
Solution Approach 2:
The patent introduces reactive silane groups that change the chemical reactivity parameters of the system. These silane-modified groups can undergo hydrolysis and condensation reactions that proceed at favorable rates, maintaining curing kinetics despite high filler content. The modified polymer structure provides optimal balance between filler compatibility and reactivity toward crosslinking agents.
3Reliability
If filler loading is increased to achieve desired conductivity, then electrical conductivity is improved, but processability of the composition is adversely affected
Solution Approach 1:
The silane-modified polymer acts as a processing aid and intermediary that improves the flow and handling characteristics of the high-filler composition. By modifying the surface of filler particles or the polymer-filler interface, the modifier reduces friction and improves distributeability during mixing and molding operations. This intermediary substance enables high filler loadings to be processed with ease comparable to conventional formulations.
4Reliability
If filler loading is increased to achieve desired conductivity, then electrical conductivity is improved, but contact resistance becomes variable
Solution Approach 1:
The silane-modified polymer creates a consistent and stable interface between filler particles, ensuring uniform electrical contact throughout the composite. This intermediary substance eliminates voids and weak boundaries that would cause variable contact resistance. By providing uniform adhesion and intimate contact between conductive filler particles, the modifier ensures consistent electrical pathways and stable contact resistance values.
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 composition achieves desired adhesion, mechanical, and chemical properties along with good conductivity, enabling the use of high filler loadings without affecting curing and processing, forming a hybrid silicone composite.
Implementation Method 1
the curable silicone composition is a condensation cure system
Data Source
AI summary
The present technology provides a curable silicone-based composition comprising a hybrid silicone polymer, a catalyst, and a filler. The present technology provides a curable silicone composition comprising a polymer A comprising an organic molecule or a siloxane molecule comprising an alkoxy radical, a hydroxyl radical, an isocyanate radical, a primary amine, or a carboxylic radical; optionally a polymer B comprising an organic molecule, a siloxane molecule, or a hybrid-siloxane molecule; a catalyst; and a filler.