Journal
COMPOSITES SCIENCE AND TECHNOLOGY
Volume 154, Issue -, Pages 45-52Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compscitech.2017.11.003
Keywords
Functional composite; Electrical properties; Carbon nanotubes; Interphase; Heat treatment
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Funding
- Natural Science Foundation of China [51702223, 51421061]
- Full-time Postdoctoral Research Fund of Sichuan University [2017SCU12026]
- State Key Laboratory of Polymer Materials Engineering [sklpme2016-3-05]
- Engineering Research Center of Marine Bioresources Comprehensive Utilization, SOA [MBRCU201601]
- Program of Innovative Research Team for Young Scientists of Sichuan Province [2016TD0010]
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Conductive polymer composites featuring double-percolated network structures have attracted widespread interest. Constructing such a structure and controlling the trans-phase migration of the conductive filler remain the main challenges for the application of these conductive polymer composites. In this study, we report a novel two-step in situ microfibrillation and microfiber coalescence strategy that includes melt-drawing and a compressive annealing process to achieve a stable, double-percolated network of a polybutene-1 (PB-1)/polystyrene (PS)/multiwalled carbon nanotubes (MWCNTs) ternary system. Triggered by the compressive annealing treatment, inter-fiber coalescence led to the formation of an interconnected network, resulting in excellent conductive performance (volume resistivity down to 4.6 x 10(3) Omega cm) with a MWCNT dosage as low as 1 wt%. Surface energy calculations and experimental evidence both indicated that the selective distribution of the MWCNTs in the PS phase resulted from the preferential surface wetting behavior and pi-pi interactions between the MWCNT5 and PS, which also immobilized the MWCNTs, even at elevated temperatures. This work established a facile and scalable technology for constructing double-percolated structures in multiphase systems, thus providing access to intriguing functionalities and applications. 2017 Elsevier Ltd. All rights reserved.
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