低温等离子体处理对聚酰亚胺纳米复合薄膜表面特性的影响  

Effect of Non-thermal Plasma Modification on Surface Characteristics of Polyimide Nanocomposites Film

作　　者：徐萌 安钊 王野 尹豪杰 程高远 张兴涛[2] XU Meng;AN Zhao;WANG Ye;YIN Haojie;CHENG Gaoyuan;ZHANG Xingtao(CRRC Changchun Railway Vehicles Co.,Ltd.,Changchun 130062,China;School of Electrical Engineering,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]中车长春轨道客车股份有限公司,吉林长春130062 [2]西南交通大学电气工程学院,四川成都610031

出　　处：《绝缘材料》2021年第5期47-53,共7页Insulating Materials

摘　　要：本文利用介质阻挡放电(DBD)试验平台产生低温等离子体,用低温等离子体改性聚酰亚胺(PI)纳米复合薄膜,对低温等离子体改性前后的纳米复合薄膜进行表面形貌、化学键结构、表面电导及耐电晕性能测试,研究薄膜表面特性的变化规律。结果表明:表面改性后,纳米复合薄膜表面逐渐变粗糙,并出现微孔、不连续凸起物。合理的等离子体改性时间可以在薄膜表面引入极性基团。随着改性时间的增加,接触角逐渐减小,表面能和表面电导率逐渐加大,耐电晕寿命增加到一定程度随后逐渐减小。当等离子体改性时间为10 s时,改性后的纳米复合薄膜的耐电晕寿命比未改性的纳米复合薄膜提高了15.7%。经过低温等离子体改性后,纳米复合薄膜表面相比纯PI薄膜表面更加均匀,改性后的纳米复合薄膜具有表面能小、表面电导率大的特性。较大的表面电导率会加快纳米复合薄膜表面电荷消散的速度,避免局部场强的集中产生表面放电,从而提高了薄膜的耐电晕寿命。要获得相同的改性效果,纳米复合薄膜需要的低温等离子体处理时间比纯PI薄膜稍长。In this paper,the low-temperature plasma was generated by DBD test platform,and the polyimide(PI)nanocomposite film was modified by the low-temperature plasma.The surface morphology,chemical bond structure,surface conductivity,and corona resistance of the nanocomposite film before and after the lowtemperature plasma modification were tested to study the change law of the film surface characteristics.The results show that after surface modification,the nanocomposite film surface becomes rough gradually,and there are micropores and discontinuous protrusions appeared.Polar oxygen-rich groups were introduced on the surface by plasma modification with appropriate modification time.With the increase of modification time,the contact angle decreases,the surface energy and surface conductivity increase,and the corona resistance life increases at first and then decreases.When the low-temperature plasma modification time is 10 s,the corona resistance life of the modified nanocomposites film is 15.7%higher than that of the unmodified nanocomposites film.After modified by the low-temperature plasma,the nanocomposite film has more uniform surface than the pure PI film,and the modified nanocomposite film has the characteristics of small surface energy and large surface conductivity.The large surface conductivity will accelerate the dissipation speed of surface charge of the nanocomposite film,avoid the surface discharge produced by the concentration of local field strength,thereby improving the corona resistance life of the film.To obtain the same modification effect,the nanocomposite film need longer low-temperature plasma modification time than pure PI film.

关 键 词：等离子体处理 聚酰亚胺 纳米复合 耐电晕寿命 

分 类 号：TM215.3[一般工业技术—材料科学与工程] TQ323.7[电气工程—电工理论与新技术]