Conductive Polymer Material Using Optimized Carbon Nanofiber Morphology
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Solution Overview
Problem
Conventional methods for producing conductive polymer materials with carbon nanofibers require energy-intensive processes, high filler content, or fiber shortening, which are costly and inefficient, and result in suboptimal conductivity.
Innovation Solution
A conductive polymer material comprising carbon nanofibers with specific properties, such as a median diameter of 0.1 to 8 μm, powder resistivity of 0.03 Ωcm or less, and a D/G ratio of 0.5 to 1.3, combined with a polymer material, using catalysts like cobalt-magnesium or titanium oxides to enhance dispersibility and crystallinity, reducing the need for energy-intensive processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional carbon nanofiber is used as filler, then high electric conductivity can be obtained with relatively low filler content, but poor dispersibility occurs due to fiber complex entanglement
Solution Approach 1:
The patent changes the physical parameters of carbon nanofiber, specifically controlling the outer diameter to 5-100 nm and aspect ratio to 10 or more, to optimize both dispersibility and conductivity. This parameter optimization allows the nanofiber to achieve good dispersion in the polymer matrix while maintaining high electrical conductivity.
Solution Approach 2:
The patent creates a composite material system combining carbon nanofiber with polymer matrix, where the specific morphology of carbon nanofiber (controlled diameter and aspect ratio) enables synergistic effects between the filler and matrix, achieving both good dispersibility and high conductivity simultaneously.
2Stability of the object's composition
If composition with polymer material using solvent is performed to improve conductivity, then dispersibility improves, but energy and cost increase
Solution Approach 1:
The patent extracts and eliminates the solvent composition step from the conventional process. By optimizing the carbon nanofiber morphology parameters (diameter and aspect ratio), the invention achieves good dispersibility directly through melt mixing without requiring solvent-based pre-composition, thereby removing the energy-intensive and costly solvent recovery step.
Solution Approach 2:
The optimized carbon nanofiber morphology enables the material to self-disperse effectively in the polymer matrix during standard melt processing, without requiring additional solvent-based treatment steps. The inherent physical properties of the nanofiber facilitate spontaneous dispersion during normal processing operations.
3Reliability
If heating and maintaining conductive polymer material is performed to improve conductivity, then conductivity improves, but energy and cost increase
Solution Approach 1:
The patent eliminates the additional heating and maintaining step from the conventional process. By optimizing the carbon nanofiber morphology (outer diameter 5-100 nm, aspect ratio ≥10), the material achieves high conductivity through standard melt mixing alone, removing the need for subsequent thermal treatment steps that consume energy.
4Stability of the object's composition
If fiber shortening using ball mill is performed to improve dispersibility, then dispersibility improves, but energy and cost increase
Solution Approach 1:
The patent performs preliminary optimization of carbon nanofiber morphology parameters (controlling outer diameter to 5-100 nm and aspect ratio to ≥10) before the mixing process. This preliminary preparation ensures that the nanofiber disperses easily during standard melt mixing, eliminating the need for subsequent mechanical shortening operations using ball mills or other high-energy equipment.
Data Source
AI summary
By using CNF excellent in dispersibility, conductivity, and crystallinity, a conductive polymer material having high conductivity even with a low CNF content and a shaped article thereof and a conductive polymer material with a less CNF content for same conductivity and a shaped article thereof are provided. A conductive polymer material with high conductivity is produced by using carbon nanofiber with a median diameter D50 value from 0.1 to 8 μm, powder resistivity of 0.03 Ωcm or less measured under a load of 9.8 MPa, and D/G from 0.5 to 1.3.