原纤化天丝纤维纸基复合材料的制备及其电气性能的研究

天丝纤维作为一种可再生纤维,具有多重原纤结构的特点,通过原纤化处理制备的微纳米级别的天丝纤维可广泛应用于超级电容器、电池隔膜等材料领域。本文选取高度原纤化的天丝纤维,探讨了天丝纤维纸基复合材料结构对其介电常数及击穿电压的影响规律。结果表明,天丝纤维纸基复合材料的相对介电常数实测值与按照体积比经验理论公式模拟计算值有较好对应性;采用具有微纳米直径的天丝纤维制备的定量40 g/m^2的电解电容器纸,压光后介电强度可达到18.27 kV/mm;参考复合介质串联电容模型,可根据单层纸参数计算双层天丝纤维纸基复合材料的击穿电压,从而指导双层电容器隔膜的结构配方设计。

Preparation and electrical properties of fibrillated tencel fiber paper

As a kind of renewable fiber,tencel fiber has the characteristics of multiple fibril structure.Tencel fiber prepared by fibrillation treatment can be widely used in materials such as supercapacitors and battery separators.In this paper,the highly fibrillated tencel fiber was selected,and the influence of the structure of tencel fiber paper on its dielectric constant and breakdown voltage was discussed.The results show that the measured values of the relative dielectric constant of the tencel fiber paper were in good agreement with the empirical calculations based on the volumetric empirical formula.Using 40 g/m 2 electrolytic capacitor paper prepared with tencel fiber,the dielectric strength after calendering could reach18.27 kV/mm.Considering the composite dielectric series capacitance model,the breakdown voltage of the double-layer tencel fiber paper could be calculated according to the parameters of single-layer paper,thereby guiding the structural formula design of the double-layer capacitor separator.