首页|有机化蒙脱土对XLPE/OMMT纳米复合电介质微观形态及水树枝老化特性的影响

有机化蒙脱土对XLPE/OMMT纳米复合电介质微观形态及水树枝老化特性的影响

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文中采用熔融共混法分别制备了交联聚乙烯/有机化蒙脱土(XLPE/OMMT)纳米复合电介质,研究有机化蒙脱土种类对纳米复合电介质微观形态和水树枝老化特性的影响.对试样进行力学性能测试发现,OMMT质量分数为0.5%时,综合力学性能达到最佳;利用差示扫描量热法和扫描电子显微镜研究了试样的微观形态,经双十八烷基苄基季铵盐有机化改性并细化的有机化蒙脱土(OMMT3)起到明显的异相成核作用,使晶体更加完善,结晶度高达25.3%,晶体平均尺寸仅为16.67 μm;采用水针电极法对各试样进行加速水树枝老化试验,剥离分散的OMMT3片层形成了更加曲折的迷宫路径,其对水分子的阻隔效应与XLPE交联网状结构对分子链运动束缚的共同作用,有效抑制了XLPE/OM-MT3试样中水树枝的生长,引发概率下降至23.4%;傅里叶变换红外光谱对水树枝老化前后的化学结构进行了表征,纳米复合电介质水树区的羰基指数增加、羟基振动峰增强,表明水树枝老化是电化学降解的作用;在水树枝生长过程中,XLPE/OMMT3试样老化断链较少,表现出较优的耐热氧老化性能.
Effect of Organic Montmorillonite on the Micromorphology and Water-Tree Aging Properties of XLPE/OMMT Nanocomposite Dielectrics
Crosslinked polyethylene/organic montmorillonite(XLPE/OMMT)nanocomposite dielectrics were prepared by melt blending method to investigate the effects of organic montmorillonite types on the micromorphology and water-trees aging properties of the nanocomposite dielectrics.The specimens were tested by mechanical properties.It is found that the comprehensive mechanical properties reach the best when the mass fraction of OMMT is 0.5%.The micromorphology of the specimens was investigated by differential scanning calorimetry and scanning electron microscope.The organic montmorillonite(OMMT3)organically modified with dioctadecyl benzyl quaternary ammonium salt and refined,plays an obvious role of heterogeneous nucleation,leading to a more perfect crystal with a crystallinity up to 25.3%,and the average size of the crystals is only 16.67 μm.Accelerated water-tree aging tests were performed on each specimen by water needle electrode method.The stripping of the dispersed OMMT3 layer forms a more tortuous labyrinth path,and its barrier effect on water molecules and the restraint of XLPE crosslinked network structure on the movement of molecular chains,the combined effect of the two effectively inhibits the growth of water trees in XLPE/OMMT3 specimen,and the initiation probability is reduced to 23.4%.The chemical structure of the water trees before and after aging was characterized by Fourier transform infrared spectroscopy.The test results indicate that the increase of carbonyl index and vibration peak of hydroxyl in the water-tree region of nanocomposite dielectrics indicate that water-tree aging is due to electrochemical degradation,while the chain breakage of XLPE/OMMT3 is less in the process of water-trees growth,showing excellent thermal and oxygen aging resistance.

organic montmorillonitecrosslinked polyethylenenanocomposite dielectricmicromorphologywater tree

高嫄、董瑞雪、李秀峰、刘正第、李昊泽、马涛

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山东理工大学电气与电子工程学院,山东淄博 255000

国网淄博供电公司,山东淄博 255000

有机化蒙脱土 交联聚乙烯 纳米复合电介质 微观形态 水树枝

2024

高分子材料科学与工程
中国石油化工股份有限公司科技开发部 国家自然科学基金委员会化学科学部 高分子材料工程国家重点实验室 四川大学高分子研究所

高分子材料科学与工程

CSTPCD北大核心
影响因子:0.563
ISSN:1000-7555
年,卷(期):2024.40(1)
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