Improvement on polyimide film surface charge measuring method

Abstract

The invention relates to improvement on a polyimide (PI) film surface charge measuring method. The improvement on the PI film surface charge measuring method is characterized in that a pin electrode and a probe are respectively fixed at two ends of a semi-enclosed container, after the PI film is discharged in a corona mode, the PI film is moved to the position below the capacitance probe through a movable tray, and data of surface charges of the PI film are collected. During the whole experiment, humidity in the container can be adjusted through the weight of a drying agent inside the semi-enclosed container, and the whole measuring process is easy to operate, little in interference by external environment, controllable in measuring environment and accurate in measured data.

Description

Technical field [0001] The invention relates to an improvement of a method for measuring the surface charge of a polyimide film, more precisely, the steps of measuring the surface charge of the polyimide film are simpler, the external conditions are more controllable, and the measurement result is more accurate. Background technique [0002] In the field of electrical insulation technology, there are many kinds of organic films commonly used, mainly including polyester (polyethylene terephthalate) film, polypropylene film, polyvinyl chloride film, polyethylene film, polystyrene film, polyamide imide films, etc. Among them, polyimide (PI) film has become the first choice of organic film in the field of electrical insulation technology due to its excellent dielectric properties, heat resistance and mechanical properties. [0003] As a special engineering material, PI film is a heat-resistant resin developed in the 1960s under the arms race and space development between the Un...

AI Technical Summary

Problems solved by technology

[0004]In recent years, researchers have found that under the action of an external electric field, free charges will accumulate at the solid-gas interface to form surface charges, which exist in the surface flash of PI thin film media. The network plays an important role in the insulation failure process, which reduces the corona resistance of PI thin films and limits the development of PI thin films.

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