Research On The Influence Factors And Mechanism Of Timeliness Of Surface Electrical Properties Of Plasma Modified Epoxy Resin

Plasma modification technology has been widely used in material surface modification because of its strong controllability,simple operation and good safety.However,some studies show that the effect of plasma modification will weaken with the increase of placement time,that is,there is timeliness.At present,the research on plasma treatment to improve the surface electrical properties of epoxy resin（EP）has been more in-depth,but there is no systematic research on its timeliness.In this paper,plasma pure argon etching,fluorination and Si O_x deposition were used to modify the surface of epoxy resin,and the samples placed for different times after modification were tested to explore the aging law of plasma treatment to improve the electrical properties of EP surface;By controlling the single variable method,the effects of plasma modification treatment time and storage environment of modified materials on timeliness were explored.Firstly,plasma modified EP samples were prepared,and the effect of treatment time on aging was explored.Set the duration of plasma modification as a variable,test the surface electrical properties of the modified samples placed in the same environment for different times,and explore the influence of the duration of treatment on the timeliness;Combined with the characterization of the physical and chemical properties of the sample surface,the mechanism of its effect on aging was analyzed.after 30 days,the modification effect of pure argon etching for 1 min degrades,the surface chemical components of EP samples change greatly,and the electrical properties decline,that is,the aging property is obvious;The surface electrical properties of the samples modified by pure argon etching for 3min,fluorination for 4min and Si Ox deposition for 2min and 3min remain good,and the aging property is relatively not obvious.Secondly,the effect of storage environment temperature on aging was explored.Set a certain plasma treatment time and the storage environment temperature of the modified sample as the variable.By comparing the test results of the surface electrical and physical and chemical properties of the sample placed in different temperature environments,explore the influence law and mechanism of temperature on aging.The results show that the low-temperature environment is conducive to the maintenance of the modification effect.The surface electrical properties of the samples stored in the high-temperature environment decline more greatly and the aging is more obvious.Finally,the plasma surface modification samples were placed in atmosphere,vacuum and SF₆ gas environment respectively to explore the influence of gas environment on aging.The test results show that the surface C/O value of pure argon etching modified sample placed in atmospheric environment is sma ller than that of vacuum and SF₆,and the electrical performance is better;The fluorinated modified sample stored in SF₆ can better maintain the amount of F group on the surface,so as to maintain the effect of modification and improve electrical properti es;After Si O_xdeposition modification,the aging property is not obvious when placed in the atmosphere and vacuum environment,but after placed in SF₆ for 30 days,the Si O_xfilm deteriorates and the electrical properties degrade,showing a certain aging property.In conclusion,this paper studies the influencing factors and mechanism of plasma treatment to improve the aging of epoxy resin surface electrical properties,which provides theoretical guidance for the wider application of plasma modification.