Carbon Nanotube Polymer Filaments for Additive Manufacturing
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Solution Overview
Problem
Current additive manufacturing processes face challenges with polymer-based materials due to their poor electrical conductivity, mechanical strength, and thermal conductivity, which limits their application in mass manufacturing, and the incorporation of carbon nanotubes often results in compositional heterogeneity and high glass transition temperatures incompatible with conventional printing equipment.
Innovation Solution
A method involving dissolving polymers and carbon nanotubes in a solvent to create a solvated composite, reducing solvent content to produce a partially desolvated composite, and extruding a filament with the polymer as a continuous phase and carbon nanotubes homogeneously mixed, allowing for residual solvent to facilitate processing and maintain electrical conductivity and mechanical strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If carbon nanotubes are incorporated into polymer matrices to improve electrical conductivity and mechanical strength, then the electrical and mechanical properties are enhanced, but compositional heterogeneity occurs leading to structural weak points
Solution Approach 1:
A surfactant is introduced as an intermediary substance between carbon nanotubes and polymer matrix. The surfactant wraps around carbon nanotubes during dissolution, creating a steric barrier that prevents nanotube aggregation and ensures uniform dispersion throughout the polymer matrix, thereby maintaining compositional homogeneity while achieving improved mechanical strength
Solution Approach 2:
The invention creates a three-component composite system consisting of polymer matrix, carbon nanotubes, and surfactant. This composite approach allows the surfactant to mediate the interaction between polymer and nanotubes, ensuring both enhanced mechanical properties and uniform compositional distribution
2Reliability
If carbon nanotubes are incorporated into polymer matrices to convey electrical conductivity, then the electrical conductivity is improved, but compositional heterogeneity frequently results
Solution Approach 1:
The surfactant acts as a mediator that uniformly distributes carbon nanotubes throughout the polymer matrix by wrapping around them during the dissolution process. This prevents nanotube aggregation and ensures homogeneous electrical conductivity throughout the composite material
Solution Approach 2:
The invention changes the physical-chemical parameters of the system by introducing surfactant molecules that alter the surface properties of carbon nanotubes. This modification enables uniform dispersion and achieves both high electrical conductivity and compositional homogeneity
3Strength
If carbon nanotubes are incorporated into polymer to improve mechanical strength, then the mechanical strength is enhanced, but structural weak points occur due to compositional heterogeneity
Solution Approach 1:
The surfactant serves as a mediator that prevents carbon nanotube aggregation by forming a protective layer around each nanotube. This ensures uniform distribution throughout the polymer matrix, eliminating structural weak points while maintaining enhanced mechanical strength
Solution Approach 2:
The invention achieves homogeneous distribution of carbon nanotubes throughout the polymer matrix through surfactant-mediated dissolution. This uniform distribution eliminates structural weak points and ensures consistent mechanical properties throughout the composite material
4Temperature
If carbon nanotubes are incorporated into polymer composite, then the glass transition temperature increases, but the glass transition temperature approaches or exceeds the decomposition temperature making processing difficult
Solution Approach 1:
The surfactant acts as a thermal mediator that modifies the polymer-nanotube interface, reducing the extent of glass transition temperature increase. This allows the composite to maintain improved mechanical and electrical properties while remaining processable at conventional additive manufacturing temperatures
Solution Approach 2:
The invention changes the thermal parameters of the composite by introducing surfactant, which modifies the polymer-nanotube interactions. This reduces the glass transition temperature increase, keeping it below the polymer decomposition temperature and enabling conventional processing
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 approach enables the production of extruded filaments with improved electrical and mechanical properties, suitable for additive manufacturing, while maintaining a low glass transition temperature for compatibility with conventional equipment and extending the thermal envelope of printed objects.
Implementation Method 1
dissolving a polymer and a nanomaterial in a solvent, thereby producing a solvated composite
Implementation Method 2
reducing a solvent content of the solvated composite to within a range of about 10% to about 30% by weight, thereby producing a partially desolvated composite
Data Source
AI summary
Polymer composites containing carbon nanotubes often exhibit high glass transition temperatures, which can complicate their use in additive manufacturing processes. Extruded filaments containing carbon nanotubes and residual solvent can have desirably lowered glass transition temperatures. Extruded filaments can contain a polymer as a continuous phase, a nanomaterial such as carbon nanotubes homogeneously mixed throughout the continuous phase, and above 0% to about 15% solvent by weight. Methods for making extruded filaments can include producing a solvated composite by dissolving a polymer and a nanomaterial in a solvent, producing a partially desolvated composite by reducing a solvent content of the solvated composite to a range of about 10% to about 30% by weight, forming particles of the partially desolvated composite, supplying the particles to an extruder, and extruding a filament having the polymer as a continuous phase and the nanomaterial homogeneously mixed throughout the continuous phase, which also contains residual solvent.