Oscillatory shear‐induced alignment of ketjen black conductive particles in polylactic acid and its effect on the electrical anisotropy |
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| Authors: | Liangyao Su Pengfei Wang Zhongbin Xu Mao Peng Dong Chen |
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| Institution: | 1. Institute of Process Equipment, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou, China;2. School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts;3. MOE Key Lab Macromol Synth & Functionalizat, Department of Polymer Science & Engineering, Zhejiang University, Hangzhou, China |
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| Abstract: | This study aligned Ketjen black (KB) particles along one preferred direction in a polylactic acid (PLA) matrix using an oscillatory shear flow and investigated the effect of aligned KB on the electrical anisotropy. Under the oscillatory shear, the KB particles are aligned along the flow direction in the PLA matrix, resulting in an oriented conductive network. When the concentration of KB is in the range of 0.88–1.56 vol %, the electrical volume resistivity along the flow direction (ρ∥) decreases to ～3 × 104 Ω m and that perpendicular to the flow direction (ρ⊥) remains at ～1 × 1010 Ω m, showing an extremely large electrical anisotropy, and the ρ⊥/ρ∥ value is 3–4 orders of magnitude higher than that of previously reported carbon‐nanotube‐based electrical anisotropic composites. This strong anisotropy is attributed to the preferential alignment of KB particles with lower percolation threshold for conductive path along the flow direction. © 2015 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2016 , 54, 369–373 |
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| Keywords: | polylactic acid Ketjen black electrical anisotropy oscillatory shear oriented conductive network |
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