Abstract
Highly conductive thin films with suitable mechanical performances play a significant role in modern electronic industry. Herein, a series of ternary conductive polymer composites were fabricated by incorporating carbon black (CB) into binary conductive polymer composites of poly(amide-imide) (PAI) and polyaniline (PANI) to enhance their mechanical and conductive properties simultaneously. By varying the composition of PAI/PANI/CB ternary films, the conductivity enhanced by two orders of magnitude compared with the sum of PAI/PANI and PAI/CB binary conductive polymer composites, and a high conductivity of 1160 S m−1 was achieved. The improved conductivity is mainly because much more continuous conductive networks were constructed in the ternary conductive polymer composites. With the help of the unusual morphology, the tensile strength was also enhanced by more than 80% from 21 to 38 MPa. The origin for the improved morphology was discussed for further improvement.
Highlights
Conductive polymer composites (CPCs) have been attracting more and more attention in modern electronic industry due to their unique advantages such as flexibility, light weight, and high-throughput processing for large-area devices [1,2,3,4,5,6]
We fabricated a series of PAI/PANI conductive polymer composites [17], and the conductive property of PAI/PANI polymer composites was clearly improved compared with pure PAI
In order to disclose the origin of the improved properties, the dispersion and morphology of PAI/PANI/carbon black (CB) ternary blend composites with different weight ratios of CB were investigated by field emission scanning electron microscopy (FESEM)
Summary
Conductive polymer composites (CPCs) have been attracting more and more attention in modern electronic industry due to their unique advantages such as flexibility, light weight, and high-throughput processing for large-area devices [1,2,3,4,5,6]. Organic conductive fillers are classified into two groups—intrinsically conductive polymers (ICPs) [12,13,14,15,16,17,18] and carbonaceous fillers (CFs) [19,20,21,22,23,24,25]. The conductivity of most CPCs based on this kind of conductive filler is relatively low [31,32,33]; more importantly, their mechanical performance clearly deteriorates with the increasing content of ICPs [17,34,35]. Carbon nanotubes (CNTs), as a kind of carbonaceous filler, have been regarded as ideal conductive fillers, which can improve conductive and mechanical performance simultaneously [36,37,38,39,40]
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