Multifunctional starch/carbon nanotube composites with segregated structure: Electrical conductivity, electromagnetic interference shielding effectiveness, thermal conductivity, and electro‐thermal conversion

Author:

Mei Xiangxiang1,Zhao Yunfeng1,Jiang Haowei1,Gao Tianyuan1,Huang Zhao‐Xia1,Qu Jin‐Ping1ORCID

Affiliation:

1. National Engineering Research Center of Novel Equipment for Polymer Processing, Key Laboratory of Polymer Processing Engineering Ministry of Education, Guangdong Provincial Key Laboratory of Technique and Equipment for Macromolecular Advanced Manufacturing, School of Mechanical & Automotive Engineering, South China University of Technology Guangzhou 510640 China

Abstract

AbstractConductive polymer composites with segregated structure (s‐CPCs) are widely used in the electronics industry. Achieving selective distribution of the conductive fillers in the polymer matrix is an effective way to construct s‐CPCs. In this work, the starch was used as the matrix and the carbon nanotube (CNT) was used as the conductive fillers to fabricate multifunctional s‐CPCs, via simple mechanical mixing and compression molding. During the processing, the starch underwent partial gelatinization, which was conducive to the fusion of the starch granules and the selective distribution of the CNT. Scanning electron microscope and atomic force microscope images showed that the CNT was attached to the surface of the starch granules to form a segregated structure. The starch/CNT composites exhibited a significant percolation, with a percolation threshold of 0.24 vol%. When the CNT content was 3.05 vol%, the starch/CNT composites exhibited a high electromagnetic interference (EMI) shielding effectiveness of 33.12 dB, which was commercially applicable in EMI shielding devices. The starch/CNT composites also possess good thermal management properties and can be used as thermal conductors and electro‐thermal conversion devices. This work manifests the application prospect in the field of the electronics industry and broadens the application potential of starch.

Funder

Guangdong Basic and Applied Basic Research Foundation

National Key Research and Development Program of China

National Natural Science Foundation of China

Publisher

Wiley

Subject

Materials Chemistry,Polymers and Plastics,Surfaces, Coatings and Films,General Chemistry

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