Calculation method for corona-resistant polyimide film trap distribution
A polyimide film, distributed computing technology, applied in the direction of material analysis, measurement of electricity, and material analysis by electromagnetic means
Inactive Publication Date: 2013-06-19
天津学子电力设备科技有限公司
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However, the main chain of PI molecules generally contains benzene rings and imide ring structures. Due to electronic polarization and crystallinity, PI has a strong inter-molecular chain interaction, which causes PI molecular chains to pack closely, resulting in obvious water absorption of PI. And thermal expansion, resulting in weak corona resistance of PI film, which limits its application in high temperature and precision state
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[0019] Example of implementation: Take three polyimide films that have undergone different modification treatments as samples, and the sample size is 40mm×40mm×25μm. place the sample in figure 1 For the device shown, positively charged corona for 20 minutes. Then turn off the power, use the device shown in the figure to measure the surface potential change of the sample, and record the surface potential change process with a camera. Then the data is collected, and the distribution of sample traps is obtained according to the formula (1) (2), and the result is shown in the figure below.
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Abstract
The invention relates to a calculation method for corona-resistant polyimide film trap distribution. The method includes the following steps: 1, carrying out corona on a to-be-tested sample at the voltage of 2-5kV of positive and negative direct currents (DC) for 5-30min; 2, measuring the surface potential of the sample with a surface potentiometer; and 3, calculating the trap distribution with the following formula: E<c>-E<m>=kTln(vt) (1), wherein E<c> is the energy level of a conductive band, E<m> is the limit of the energy level, v is the surface potential measured, t is the time of dissipation of electric charges, and k and T are constants. According to the calculation, a trap distribution curve can be obtained, wherein the distribution obtained through the formula (1) is the horizontal ordinate of the trap distribution to show the range of energy level distribution of the sample, and the distribution obtained through the formula (2) is the longitudinal ordinate to show the probability densities existing at different horizontal ordinates.
Description
technical field [0001] The invention relates to a method for calculating trap distribution of a corona-resistant polyimide film. Background technique [0002] As a special engineering material, polyimide film is a heat-resistant resin developed in the 1960s under the arms race and space development between the United States and the former Soviet Union, and it is also recognized as the most successful resin. In the early stage, the excellent heat resistance of polyimide was used in motors to improve high temperature thermal stability. In the 1980s, due to the development of the electronics industry, the development of polyimide was further promoted. Due to its excellent heat resistance and good processability, it soon became a part of semiconductor groups and circuit board structures. According to the structure and preparation method of polyimide, it can be divided into two categories. One type is polyimide containing aliphatic units in the main chain, which is obtained by ...
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IPC IPC(8): G01R31/00G01N27/60
Inventor 杜伯学李杰杜伟
Owner 天津学子电力设备科技有限公司