writer：Jinrui Huang, Cui Mao, Yutian Zhu, Wei Jiang, Xiaodong Yang
keywords：双逾渗, 碳纳米管, 共连续共混, 界面分布, 导电复合材料, 逾渗阈值
source：期刊
specific source：Carbon, 2014, 73, 267-274
Issue time：2014年

摘要：“双逾渗”概念，即导电填料选择性分布于共连续聚合物共混物的某一相中形成逾渗网络，已被广泛用于将导电聚合物复合材料的逾渗阈值降低为原始值的一部分。本文进一步提出，若导电填料仅选择性分布于共连续共混物的连续界面，则只需极少量填料即可构筑导电逾渗网络，逾渗阈值有望大幅降低。通过控制多壁碳纳米管（MWCNTs）从不利的PLA相向有利的PCL相迁移，使高长径比（约1000）的MWCNTs选择性分布于质量比为50/50的聚乳酸/聚己内酯（PLA/PCL）共连续不相容共混物的连续界面。与传统双逾渗方法制备的PLA/PCL/MWCNTs复合材料（逾渗阈值约0.97 wt%）相比，将MWCNTs控制在PLA与PCL相连续界面后，PLA/MWCNTs/PCL复合材料的逾渗阈值降至约0.025 wt%，降低了两个数量级。

Abstract：The concept of double percolation, i.e., conductive fillers are selectively located in one phase of a co-continuous polymer blend to form a percolated network in the selected phase, is widely used to reduce the percolation thresholds of conductive polymer composites. It is expected that the percolation threshold can be significantly reduced further if the conductive fillers are only selectively distributed at the continuous interface of the co-continuous polymer blend. Multiwalled carbon nanotubes (MWCNTs) with very high aspect ratio (ca. 1000) were selectively distributed at a continuous interface of a co-continuous immiscible poly(lactic acid)/poly(e-caprolactone) (PLA/PCL) blend at a weight ratio of 50/50 by controlling the migration process of MWCNTs from the unfavorable PLA to the favorable PCL phase. Compared with the PLA/PCL/MWCNTs composites by the traditional double percolation method (percolation threshold ca. 0.97 wt%), the percolation threshold of PLA/MWCNTs/PCL composites (ca. 0.025 wt%) dropped two orders of magnitude due to controlling the MWCNTs at the continuous interface between the PLA and PCL phases.

论文链接：https://doi.org/10.1016/j.carbon.2014.02.063