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通过实验研究了搅拌时间和炭黑表面改性对炭黑/环氧树脂导电复合材料电阻率和力电性能的影响。实验结果表明,随着搅拌时间的延长,炭黑在环氧树脂中的分散性提高,炭黑在环氧树脂中形成的一些导电链被破坏,从而导致复合材料的电阻率提高,电阻率变异系数减小及同批试件的电阻随应变的变化率趋于一致。但进一步延长搅拌时间并不能提高分散性,炭黑仍是以较大聚附体的形式存在。炭黑经偶联剂表面改性后,在环氧树脂中的分散性得到进一步的提高。改性后炭黑以小的聚附体甚至单颗粒的形式分散于环氧中,从而减小了复合材料中分布于炭黑颗粒间环氧树脂间隙的宽度,使复合材料的电阻率和电阻随应变的变化率减小。
The effects of mixing time and surface modification of carbon black on the resistivity and electromechanical properties of carbon black / epoxy resin composites were studied experimentally. The experimental results show that with the extension of stirring time, the dispersibility of carbon black in epoxy resin is improved. Some conductive chains formed by carbon black in epoxy resin are destroyed, which leads to the increase of resistivity, The coefficient decreases and the same batch of specimens with the rate of change of resistance tends to be consistent. However, to further extend the mixing time does not improve dispersibility, carbon black is still in the form of larger polyadducts. After the surface modification of the carbon black by the coupling agent, the dispersibility in the epoxy resin is further improved. The modified carbon black is dispersed in the epoxy in the form of small polycarbosilates or even single particles, so as to reduce the width of the epoxy resin interspace between the carbon black particles in the composite material, and reduce the resistivity and the electrical resistance of the composite material The rate of change with strain decreases.