Journal Article

Preparation and properties of carbon black/polymer composites with segregated and double-percolated network structures

Bao, Yu, Yan, Ding-Xiang, Chen, Chen, Zhang, Wei-Qin, Pang, Huan, Xu, Ling, Tang, Jian-Hua, Li, Zhong-Ming

2013

Overview

A carbon black (CB)/low-density polyethylene (LDPE)/ultrahigh-molecular-weight polyethylene (UHMWPE) composite with a segregated and double-percolated structure has been fabricated using the solution mixing and high-speed mechanical mixing method. Structural observations show that the conducting CB/LDPE layers were only dispersed at the interface of UHMWPE granules and formed a well-developed CB conductive network with a percolation threshold of 0.26 vol%. The low percolation threshold in CB/LDPE/UHMWPE composites can be explained by the segregated and double-percolated networks of CB within the polymer matrix. A noticeable double positive temperature coefficient of resistivity can be observed around the melting temperature of LDPE and UHMWPE followed by a negative temperature coefficient of resistivity. The microstructure evolution of CB/LDPE/UHMWPE composites can be observed and explained by in situ optical micrographs.

• Publisher: Springer US,Springer,Springer Nature B.V
• Subject: Analysis / Carbon black / Characterization and Evaluation of Materials / Chemistry and Materials Science / Classical Mechanics / Composite materials industry / Crystallography and Scattering Methods / Electric properties / Electrical resistivity / Granular materials / Low density polyethylenes / Materials Science / Melt temperature / Networks / Percolation / Photomicrographs / Polyethylene / Polyethylenes / Polymer matrix composites / Polymer Sciences / Positive temperature coefficient / Solid Mechanics / Thresholds