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Ultralow Percolation Threshold and Enhanced Electromagnetic Interference Shielding in Poly(L-lactide)/Multi-Walled Carbon Nanotubes Nanocomposites with Electrically Conductive Segregated networks

Abstract

Electrically conductive segregated network was built in poly(L-lactide)/multi-wall carbon nanotubes (PLLA/MWCNTs) nanocomposites without sacrificing mechanical properties via simply choosing two different PLLA with different viscosity and crystallinity. First, the MWCNTs were dispersed in PLLA with low viscosity and crystallinity (L-PLLA) to obtain the L-PLANT phase. Second, the PLLA particles with high viscosity and crystallinity (H-PLLA) were well coated with L-PLANT phase at 140 oC which was below the melting temperature of H-PLLA. Finally, the coated H-PLLA particles were compressed above the melting temperature of H-PLLA to form the PLLA/MWCNTs nanocomposites with segregated structures. The morphological observation showed the successful location of MWCNTs in continuous L-PLLA phase, resulting in an ultralow percolation threshold of 0.019 vol.% MWCNTs. The electrical conductivity and the electromagnetic interference (EMI) shielding effectiveness (SE) of the composites with the segregated structure are 25 S/m and ~30 dB, showing three orders and 36% higher than that of the samples with random distribution of MWCNTs with 0.8 vol.% of MWCNTs loading. High-performance electromagnetic interference (EMI) shielding was also observed mainly dependent on the highly efficient absorption shielding, which can be achieved by the densely continuous MWCNTs networks and the abundant interfaces induced by the segregated structures. Furthermore, the composites with the segregated structure not only showed higher Young’s modulus and tensile strength than the corresponding conventional composites, but also maintained high elongation at break because of the continuous and dense MWCNTs networks induced by the segregated structure and the high interfacial interaction between H-PLLA and L-PLLA.

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Publication details

The article was received on 30 Jun 2017, accepted on 31 Jul 2017 and first published on 31 Jul 2017


Article type: Paper
DOI: 10.1039/C7TC02948A
Citation: J. Mater. Chem. C, 2017, Accepted Manuscript
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    Ultralow Percolation Threshold and Enhanced Electromagnetic Interference Shielding in Poly(L-lactide)/Multi-Walled Carbon Nanotubes Nanocomposites with Electrically Conductive Segregated networks

    K. Zhang, G. Li, L. Feng, N. Wang, J. Guo, K. Sun, K. Yu, J. Zeng, Z. Guo and M. Wang, J. Mater. Chem. C, 2017, Accepted Manuscript , DOI: 10.1039/C7TC02948A

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