Conductive Polymer Composite with Lower Filler Percolation
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Solution Overview
Problem
Existing polymer composite systems require high concentrations of conductive fillers for significant electrical conductivity, which adversely affect mechanical properties and exhibit brittleness, especially in cable applications.
Innovation Solution
A ternary-phase polymer composite comprising specific combinations of ethylene copolymers with unsaturated esters, non-polar polymers, and ethylene propylene diene monomer copolymers, where the conductive filler is dispersed only in one component, reducing the percolation threshold and improving flexibility and mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high concentration of conductive filler is used to achieve significant electrical conductivity, then electrical conductivity is improved, but mechanical properties deteriorate and brittleness increases
Solution Approach 1:
The patent changes the physical and chemical parameters of the polymer system by introducing a ternary blend with specific glass transition temperatures and polarity characteristics. This modifies the matrix properties to enable lower percolation threshold, allowing conductivity achievement at reduced filler concentrations that preserve mechanical integrity
Solution Approach 2:
The invention uses a composite polymer system combining three different polymer components with specific properties (glass transition temperatures spanning -50°C to 0°C, varying polarity, and complementary Tg ranges). This multi-phase composite matrix optimizes both electrical and mechanical properties simultaneously
2Reliability
If high concentration of conductive filler is used to achieve significant electrical conductivity, then electrical conductivity is improved, but brittleness increases
Solution Approach 1:
The patent modifies the polymer matrix parameters by selecting components with specific glass transition temperatures and polarity. The ternary blend creates a more flexible matrix structure that accommodates conductive filler at lower concentrations, reducing brittleness while maintaining conductivity
Solution Approach 2:
The invention creates local optimization by dispersing conductive filler selectively in one polymer phase of the ternary blend rather than uniformly throughout. This localized dispersion strategy reduces overall filler concentration needs and minimizes brittleness in the final composite
3Reliability
If ternary polymer blends are used to reduce percolation threshold, then electrical conductivity is improved, but brittleness remains significant
Solution Approach 1:
The patent fine-tunes the polymer blend parameters by selecting specific glass transition temperature ranges and polarity combinations. This optimized parameter selection reduces brittleness compared to conventional ternary blends while maintaining the low percolation threshold benefit
Solution Approach 2:
The invention modifies the physical state and molecular mobility of the polymer matrix by carefully selecting components whose glass transition temperatures span a specific range. This creates a more ductile matrix that reduces brittleness while preserving electrical conductivity properties
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 achieves lower percolation threshold and enhanced flexibility with improved mechanical properties, making it suitable for cable applications by minimizing brittleness and maintaining conductivity at lower filler concentrations.
Implementation Method 1
wherein the conductive filler is dispersed only in Component (A)
Data Source
Figure 1
AI summary
A composition comprises a ternary-phase polymer composite including components (A) ethylene/unsaturated ester copolymers having γρ of from < 5 to >1 mN/m; at least two additional polymers selected from the group consisting of: (B) non-polar polymers having γρ of from > 0 to < 1 mN/m selected from the group consisting of polyethylene homopolymers, silane- functionalized polyethylene homopolymers, ethylene/alpha-olefin copolymers, and silane- functionalized ethylene/alpha-olefin copolymers, (C) ethylene/unsaturated ester copolymers having a γΡ of > 5 mN/m, and (D) EPDM copolymers; and conductive filler dispersed in only one of (A) and the at least two additional polymers, wherein (i) one of the at least two additional polymers is selected from (B) and the other is selected from (C) or (D), or (ii) one of the at least two additional polymers is selected from (C) and the other is selected from (B) or (D).