Polyamide-imide Graphite Film Preparation via Thermal Treatment
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Solution Overview
Problem
Current polyamide-imide films are unable to form artificial graphite films due to low graphitization when subjected to thermal treatment above 2,400° C., as they lack sufficient molecular weight and orientation, and the degree of graphitization remains below 80%.
Innovation Solution
A polyamide-imide film represented by a specific formula, with a dianhydride composition that increases molecular weight and toughness, and a thermal treatment process involving carbonization and graphitization at controlled temperatures and gas environments, achieving a degree of graphitization above 80%.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If general polyamide-imide film is subjected to thermal treatment at 2,400° C., then the film undergoes graphitization process, but the degree of graphitization remains low and incapable of forming artificial graphite film
Solution Approach 1:
The patent modifies the chemical composition parameters of polyamide-imide by incorporating specific aromatic dianhydrides (PMDA, BPDA, ODPA, BTDA) in controlled ratios, and adjusts the thermal treatment temperature parameter to 2,400-3,000° C. These parameter changes enable the material to achieve sufficient molecular weight and orientation, transforming it from incapable of graphitization to achieving over 80% degree of graphitization and forming artificial graphite film.
2Manufacturing precision
If polyamide-imide film undergoes thermal treatment to increase graphitization degree, then artificial graphite film can be formed, but the molecular weight and orientation of the original polyamide-imide must be sufficiently high first
Solution Approach 1:
The patent performs preliminary action by pre-synthesizing polyamide-imide with optimized molecular structure (incorporating aromatic dianhydrides in specific ratios) before thermal treatment. This preliminary preparation ensures the polymer has sufficient molecular weight and orientation, which are prerequisites for achieving high-degree graphitization and forming artificial graphite film during subsequent thermal treatment.
Solution Approach 2:
The patent creates a composite molecular structure within polyamide-imide by combining multiple aromatic dianhydride components (PMDA, BPDA, ODPA, BTDA) in specific ratios. This composite material approach enhances both molecular weight and orientation, enabling the material to meet the structural requirements for high-degree graphitization during thermal treatment.
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 method enables the formation of high-degree graphitization artificial graphite films with improved birefringence, suitable for heat-dissipation applications, by optimizing the molecular structure and thermal processing of polyamide-imide films.
Implementation Method 1
treated by a carbonization process of 1,000° C. (under a nitrogen gas environment)
Implementation Method 2
a graphitization process of 2,400° C. (under an argon gas environment)
Implementation Method 3
performing a thermal treatment process on a polyamide-imide to prepare a graphite film, wherein the temperature of the thermal treatment process ranges from 25° C. to 2,900° C.
Data Source
AI summary
A polyamide-imide represented by the following formulais provided. A graphite film prepared by performing a thermal treatment process on the polyamide-imide represented by the above-mentioned formula is also provided. In the thermal treatment process, the temperature range of the thermal treatment process ranges from 25° C. to 2,900° C.