Conductive Material with Chemically Bonded Carbon Nanotubes
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Solution Overview
Problem
Carbon nanotubes (CNTs) are difficult to disperse in polymer resins and are prone to separation in conventional manufacturing methods, leading to poor electrical properties and chemical resistance in conductive materials.
Innovation Solution
A conductive material is developed with CNTs chemically bonded to a polymer resin containing amine and carboxyl groups, forming an amide bond to prevent surface exposure and enhance chemical resistance and electrical properties, using a method involving dispersion application and solvent infiltration with an amide coupling agent.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If CNTs are layered on polymer resin substrate using physical vapor deposition (PVD) or chemical vapor deposition (CVD), then conductive film can be manufactured, but the apparatus becomes complicated and productivity decreases
Solution Approach 1:
The patent replaces complex physical vapor deposition (PVD) or chemical vapor deposition (CVD) apparatus with a simple solution-based coating process. CNTs are dispersed in a solvent to form a coating solution, which is then applied to the polymer resin substrate using conventional coating methods, eliminating the need for complicated vacuum deposition equipment while achieving comparable conductive film results
Solution Approach 2:
The patent changes the state of CNTs from dry powder form to dispersed solution form. By dissolving or dispersing CNTs in a solvent to create a coating solution with specific concentration and viscosity parameters, the process enables simple liquid-based application methods instead of complex vapor-phase deposition processes
2Stability of the object's composition
If dispersant is used to disperse CNTs in polymer resin, then dispersion is improved, but CNTs are still difficult to disperse uniformly
Solution Approach 1:
The patent uses a solvent as an intermediary medium to disperse CNTs uniformly in the polymer resin system. The solvent acts as a bridge between CNTs and polymer resin, allowing CNTs to be evenly distributed throughout the matrix through solution processing, achieving uniform dispersion that surpasses conventional dispersant-based methods
3Reliability
If CNTs are chemically bonded to polymer resin surface, then electrical properties improve, but CNTs are exposed to surface and separate under mechanical force
Solution Approach 1:
The patent embeds CNTs within the polymer resin matrix through chemical bonding, creating a nested structure where CNTs are integrated inside the polymer network rather than merely attached to the surface. This nesting approach prevents CNT exposure and separation under mechanical stress while maintaining electrical conductivity
Solution Approach 2:
The patent creates a composite material system where CNTs are chemically bonded to the polymer resin through formation of amide bonds or other chemical linkages. This composite structure integrates the conductive properties of CNTs with the mechanical properties of polymer resin, achieving both electrical performance and mechanical stability
4Ease of manufacture
If CNTs are separated upon treatment with chemical or solvent, then application process is simplified, but chemical resistance deteriorates
Solution Approach 1:
The patent performs preliminary chemical bonding between CNTs and polymer resin before final product formation. By pre-establishing strong chemical bonds between CNTs and the polymer matrix, the structure is prepared in advance to resist chemical and solvent treatments, maintaining both manufacturing simplicity and chemical resistance
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 material exhibits superior chemical resistance and electrical properties with stable conductivity under mechanical and solvent exposure, maintaining uniform surface resistivity and preventing CNT separation.
Implementation Method 1
CNTs having a carboxyl group (—COOH) chemically bonded to a polymer resin having an amine group (—NH2)
Implementation Method 2
forming an amide bond to prevent surface exposure and enhance chemical resistance
Data Source
AI summary
Disclosed is a method of manufacturing a conductive coating film having superior chemical resistance or solvent resistance and durability by chemically bonding a resin having an amine group (—NH2) with carbon nanotubes having a carboxyl group (—COOH). The conductive material having high bondability with carbon nanotubes and superior electrical properties includes carbon nanotubes uniformly contained therein, and thus has appropriate surface resistivity, and thereby can be used for antistatic, electrostatic dissipation and electromagnetic shielding purposes and in transparent or opaque electrodes depending on the resistivity value.