Carbon Nanotube Polyester Composition for Stretch-Stable Conductivity
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Solution Overview
Problem
Conductive polyester materials with high conductive properties require excessive addition of spherical conductive materials like graphite or carbon black, leading to poor extensibility and loss of conductive properties after high-rate extension.
Innovation Solution
A conductive polyester composition incorporating multi-walled carbon nanotubes with specific length and diameter ratios, dispersed in a polyester base material, along with a compatibilizer and antioxidants, to maintain high conductive properties with minimal additive content and withstand high-rate extension.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If spherical conductive materials (graphite or carbon black) are added to improve conductivity, then conductive property is improved, but extensibility deteriorates and powder falling occurs
Solution Approach 1:
The patent changes the key parameter from spherical shape (L/D < 10) to high aspect ratio (L/D ≥ 100), which fundamentally alters the conductive mechanism from percolation threshold based to contact point based, resolving the contradiction between conductivity and extensibility
Solution Approach 2:
The patent creates a composite material system combining polyester base material with high aspect ratio conductive fibers, where the fiber morphology and surface treatment work synergistically to achieve both conductivity and extensibility
2Reliability
If high proportion of spherical conductive material (greater than 20 wt %) is added to achieve conductive effect, then conductive property is improved, but material uniformity deteriorates and processing difficulty increases
Solution Approach 1:
The patent changes the conductive additive form from spherical particles to high aspect ratio fibers, which fundamentally changes the percolation threshold and conductive mechanism, allowing achieving conductive effect with much lower addition proportions and better uniformity
Solution Approach 2:
The patent introduces surface-treated conductive fibers as an intermediary that bridges the polyester matrix and conductive network, with surface treatments improving interfacial adhesion and uniform distribution
3Reliability
If spherical conductive materials are used, then initial conductive property can be achieved, but conductive property is lost after high-rate extension
Solution Approach 1:
The patent employs dynamic conductive network formed by high aspect ratio fibers that can adapt to deformation, where the fibers reorient and maintain contact points during extension, preserving conductivity dynamically throughout the extension process
Solution Approach 2:
The patent uses segmented high aspect ratio conductive fibers that can bend and reconfigure while maintaining electrical contact, dividing the conductive function into multiple contact points along the fiber length that remain effective during deformation
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 a low surface impedance and maintains conductive properties after significant extension, suitable for applications like electronic carrier trays, with a small addition of carbon nanotubes and improved processability.
Implementation Method 1
The plurality of carbon nanotubes are in contact with each other to form a plurality of contact points, so that the conductive polyester composition has a surface impedance of not greater than 107 Ω/sq
Implementation Method 2
a compatibilizer configured to assist in dispersing the plurality of carbon nanotubes in the polyester base material
Data Source
AI summary
A conductive polyester composition is provided, which includes a polyester base material and a conductive reinforcing material. The conductive reinforcing material includes a plurality of carbon nanotubes, and the plurality of carbon nanotubes are dispersed in the polyester base material. In each of the carbon nanotubes, a length of the carbon nanotube is defined as L, a diameter of the carbon nanotube is defined as D and is between 1 nanometer and 30 nanometers, and an L/D value of the carbon nanotube is between 300 and 2,000. The plurality of carbon nanotubes are in contact with each other to form a plurality of contact points, so that the conductive polyester composition has a surface impedance of not greater than 107 Ω/sq.