作者：Jianwen Chen, Xihua Cui, Kunyan Sui, Yutian Zhu, Wei Jiang
关键字：导电聚合物复合材料, 双逾渗结构, 电学性能, 力学性能, 炭黑, 增容剂
论文来源：期刊
具体来源：Composites Science and Technology, 2017, 140, 99-105
发表时间：2017年

摘要：已有研究广泛报道，在导电聚合物复合材料（CPCs）中构建双逾渗结构可有效降低复合材料的逾渗阈值。然而，由于不相容聚合物共混物之间的界面相互作用较弱，这类CPCs的力学性能通常较差。本文在PS/PP质量比为60/40的CB/PS/PP复合材料中构建了完善的双逾渗结构以降低逾渗阈值，并引入第四组分苯乙烯-乙烯/丁烯-苯乙烯（SEBS）三嵌段共聚物作为增容剂改善力学性能。虽然加入SEBS后力学性能显著提高，但当SEBS含量高于3 wt%时，电导率明显下降，这是因为增容剂加入共连续不相容共混物会减小相畴尺寸，破坏双逾渗结构的相连续性。然而，当SEBS含量为2 wt%时，复合材料仍能保持双逾渗结构，电学性能依旧优异，同时力学性能显著提高，可很好地平衡含双逾渗结构CPCs的电学性能与力学性能。

Abstract：It has been widely reported that construction of a double percolation structure in the conductive polymer composites (CPCs) can effectively reduce the percolation thresholds of the composites. However, the mechanical properties of these types of CPCs are normally inferior because of the weak interfacial interactions between the immiscible polymer blends. In the current study, we constructed a perfect double percolation structure in the CB/PS/PP composites at PS/PP weight ratio of 60w/40w to reduce the percolation threshold and introduced the fourth component, i.e., styrene-ethylene/butylene-styrene (SEBS) triblock copolymer, as the compatibilizer to improve the mechanical properties. Although the mechanical properties are significantly improved after the addition of SEBS, the electrical conductivity shows a remarkable decline when SEBS content is higher than 3 wt%, because the addition of compatibilizer into a co-continuous immiscible polymer blend reduces the sizes of the phase domains and damages the phase continuity of the double percolation structure. However, it is found that the electrical properties can still be superior because of the maintaining of the double percolation structure and the mechanical properties can also be significantly improved when SEBS content is 2 wt%, which can well balance the electrical properties and mechanical properties of the CPCs containing a double percolation structure.

论文链接：https://doi.org/10.1016/j.compscitech.2016.12.029