采用脲醛树脂作为粘合剂配合异氰酸酯制备了碳纤维增强木质复合材料(Carbon Fiber Enhanced Woodiness Composites,CFEWC).在制备过程中,通过改变碳纤维和木质纤维的配比和两种纤维之间的复合形式,研究了复合材料样板的相关电学性能,并且从多个角度分析了样板电学性能变化的原因.实验结果表明:单贴面复合材料样板和双贴面复合材料样板都具有导电性,双贴面复合材料样板具有更良好的导电性.随着碳纤维含量比重的增大,CFEWC的导电性能逐渐提高,空穴导电和π电子的数量增加;随着温度的升高,CFEWC的表面电阻率呈现出非线性的负增长态势,更多的导电粒子获得能量被激发产生了NTC(Negative Temperature Coefficient)效应.
Urea formaldehyde resin was selected as adhesive and worked with isocyanate resin to prepare carbon fiber enhanced woodiness composites ( CFEWC) . In the preparation process, the mixture ratios of carbon fiber and wood fiber and the complex forms were altered. The related electrical properties of CFEWCs were studied. Besides, the reasons for the changes of electrical properties were also analyzed from different aspects. The results showed that both single-sided composites and double-sided composites could conduct electricity. Compared with single-sided CFEWC, double-sided composites had better electrical conductivity. The electrical conductivity of CFEWC improved with carbon fiber content increased while a certain condition prevails. Besides, the quantity of hole conduction andπelectron increased. The surface resistivity represented a negative growth situation with increasing the temperature. A great many of conducting particles were motivated which led to a negative temperature coefficient ( NTC) effect.
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