CNT/Polyetherimide/Thermosetting Resin Composite for Low Dielectric Loss
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current carbon nanotube/polymer composites with high dielectric constants suffer from high dielectric loss and elevated percolation thresholds, making them difficult to process and costly, while attempts to reduce percolation thresholds through complex structural designs often compromise dielectric performance.
Innovation Solution
A carbon nanotube/polyetherimide/thermosetting resin composite is developed using untreated carbon nanotubes and a reverse-phase structure with bismaleimide resin dispersed in a polyetherimide continuous phase, achieved through Haake melt-shearing and step-curing, which maintains excellent dielectric properties and reduces dielectric loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If carbon nanotube content is increased to achieve high dielectric constant, then dielectric constant is improved, but dielectric loss increases and percolation threshold is elevated
Solution Approach 1:
The patent applies local quality by creating distinct phases with different properties: a continuous polyetherimide phase and dispersed thermosetting resin domains. Carbon nanotubes are selectively localized in the continuous phase, creating regions of high conductivity without forming percolating networks throughout the entire composite, thus achieving high dielectric constant with low dielectric loss
Solution Approach 2:
The patent uses a composite material system consisting of polyetherimide, thermosetting resin, and carbon nanotubes. This multi-phase composite structure allows the carbon nanotubes to be distributed in a controlled manner within the continuous phase, achieving optimal dielectric performance by combining the insulating properties of polyetherimide with the conductive properties of carbon nanotubes and the crosslinked structure of thermosetting resin
2Quantity of substance
If complex structural design is used to reduce percolation threshold, then percolation threshold is reduced, but manufacturing complexity increases and dielectric performance is compromised
Solution Approach 1:
The patent changes the physical and chemical parameters of the system by using a specific polymer blend (polyetherimide and thermosetting resin) with particular phase separation characteristics. This parameter change creates a natural template for carbon nanotube localization, reducing the percolation threshold without requiring complex structural designs or surface treatments
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 a high dielectric constant with low dielectric loss and a lowered percolation threshold, facilitating easy large-scale production and maintaining the excellent electrical properties of carbon nanotubes without surface treatment.
Implementation Method 1
Owing to outstanding electrical properties, large length to diameter ratio and good mechanical properties, carbon nanotubes have attracted much attention
Implementation Method 2
the resin substrate has a reverse-phase structure composed of a continuous phase and a dispersed phase
Implementation Method 3
achieved through Haake melt-shearing
Implementation Method 4
achieved through Haake melt-shearing and step-curing
Data Source
AI summary
The invention discloses a carbon nanotube/polyetherimide/thermosetting resin dielectric composite and a preparation method therefor. 100 parts by weight of polyetherimide and 1-7 parts by weight of carbon nanotube are mixed uniformly in an Haake torque melt cavity to obtain a carbon nanotubes/polyetherimide composite; 20 parts of the carbon nanotube/polyetherimide composite are dissolved in 100-150 parts of dichloromethane, then the mixed solution is added in 100 parts of molten thermocurable thermosetting resin, mixing, and heat preserving, stirring are performed until a mixture is formed in a uniform state, and curing and post-treating are performed to obtain a carbon nanotube/thermosetting resin dielectric composite, wherein the substrate thereof has a typical reverse phase structure, while the carbon nanotubes are dispersed in a polyetherimide phase. The composite has a relatively low percolation threshold, a high dielectric constant and a low dielectric loss. The preparation method of the present invention has a simple process and is suitable for large-scale production.