SiO_2/聚酰胺酰亚胺纳米复合材料的介电与热性能
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摘要
采用微乳化-相转变法制备纳米SiO_2分散液,与聚酰胺酰亚胺树脂机械共混并流延成膜,制成不同纳米含量的复合材料。采用透射电子显微镜(TEM)和傅里叶变换红外光谱(FTIR)对材料进行表征,按照IEC60343的标准测试了材料的耐电晕寿命和其它介电性能,并进行了热重分析。结果表明,纳米粒子在PAI基体中分散均匀且反应完全;加入纳米粒子提高了材料的热稳定性;随纳米粒子含量的增加,电导率、介电常数和介质损耗均发生有规律的变化,PAI复合材料的耐电晕寿命随SiO_2含量的增加而增加,纳米粒子含量达到20%时,耐电晕寿命为17. 35 h,是纯PAI材料的8倍以上;击穿强度随纳米粒子含量的增加而减小。
The nano-SiO_2 dispersions were prepared by microemulsification-phase transformation method and mechanically blended with polyamide-imide resin, and then cast into films with different nano-contents.Nanocomposite films were characterized by transmission electron microscopy( TEM) and Fourier transform infrared spectroscopy( FT-IR). The corona resistance life and other dielectric properties of the material were tested in accordance with the IEC60343 standard and thermogravimetric analysis was carried out. The results show that nano SiO_2 particles are uniformly dispersed in PAI matrix and materials reacted completely. The thermal stability of the composites are enhanced by adding nano particles. With the increase of SiO_2 content,the electrical conductivity,dielectric constant and dielectric loss changes regularly. Compared with pure PAI,the corona resistance life of nanocomposite with 20% SiO_2 is 17. 35 h,which increases more than eight times. However,the breakdown strength of nanocomposites is a little lower with increase of nano-SiO_2 loading.
The nano-SiO_2 dispersions were prepared by microemulsification-phase transformation method and mechanically blended with polyamide-imide resin, and then cast into films with different nano-contents.Nanocomposite films were characterized by transmission electron microscopy( TEM) and Fourier transform infrared spectroscopy( FT-IR). The corona resistance life and other dielectric properties of the material were tested in accordance with the IEC60343 standard and thermogravimetric analysis was carried out. The results show that nano SiO_2 particles are uniformly dispersed in PAI matrix and materials reacted completely. The thermal stability of the composites are enhanced by adding nano particles. With the increase of SiO_2 content,the electrical conductivity,dielectric constant and dielectric loss changes regularly. Compared with pure PAI,the corona resistance life of nanocomposite with 20% SiO_2 is 17. 35 h,which increases more than eight times. However,the breakdown strength of nanocomposites is a little lower with increase of nano-SiO_2 loading.
引文
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[3]WANG Y,JIANG L,MATSUURA T,et al.Investigation of the Fundamental Differences Between Polyamide-imide(PAI)and Polyetherimide(PEI)Membranes for Isopropanol Dehydration Via Pervaporation[J].Journal of Membrane Science,2008,318(1-2):217.
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[5]李卓,刘金刚,高志琪,等.有机可溶性高折射率聚酰胺酰亚胺的合成与性能[J].高分子学报,2009,1(1):17.
[6]SUN D,YIN J,LIU Y,et al.The Electrical and Thermal Properties of Polyimide/boron Nitride Nanocomposite Films[J].Journal of Polymer Research,2016,23(12):254.
[7]LEWIS T J.Interfaces:Nanometric Dielectrics[J].Journal of Physics D Applied Physics,2005,38(2):202.
[8]冯宇,殷景华,陈明华,等.聚酰亚胺/Ti O2纳米杂化薄膜耐电晕性能的研究[J].中国电机工程学报,2013,36(22):142.
[9]刘立柱,梁冰,王伟,等.杂化聚酰亚胺薄膜无机相形貌和介电性能研究[J].材料科学与工艺,2006,14(3):265.
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[13]陈宇飞,李世霞,白孟瑶,等.二氧化硅改性环氧树脂胶黏剂性能研究[J].哈尔滨理工大学学报,2011,16(4):21.
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[15]LIN J Q,LIU Y,YANG W L,et al.Structure and Mechanical Properties of the Hybrid Films of Well Dispersed SiO2,Nanoparticle in Polyimide(PI/SiO2)Prepared by Sol-gel Process[J].Journal of Polymer Research,2014,21(8):1.
[16]刘洋,吴广宁,高国强,等.方波脉冲下纳米氧化硅掺杂对聚酰亚胺绝缘性能的影响[J].高压电器,2016(1):73.
[17]LIN J Q,LIU Y,YANG W L,et al.Investigation on the Morphology and Dielectric Properties of PI/SiO2Nanocomposite Films[J].Advanced Materials Research,2014,1015:250.
[18]LIU L,WANG W,LEI Q.Study on Polyimide/Nano-SiO2Corona-resistance Composite Film[J].Ieej Transactions on Fundamentals&Materials,2006,126(11):1144.
[19]范勇,陈昊,周宏.用无机的非金属或金属元素改性纳米氧化铝粒子的方法[P].中国专利,CN102127323A,2011-07-20.
[20]MOSTAFA N Y,MOHAMED M B,IMAM N G,et al.Electrical and Optical Properties of Hydrogen Titanate Nanotube/PANI Hybrid Nanocomposites[J].Colloid and Polymer Science,2016,294(1):215.
[21]陈昊,范勇,杨瑞宵,等.聚酰亚胺薄膜绝缘材料耐电晕机理研究[J].电机与控制学报,2013,17(5):28.