Injection Molded Segregated Carbon Nanotube/Polypropylene Composite\nfor Efficient Electromagnetic Interference Shielding

Abstract

Constructing segregated structure\nin conductive polymer composite (CPC) is effective to achieve high\nelectromagnetic interference shielding effectiveness (EMI SE) at low\nfiller loading. Nevertheless, the present segregated CPCs were only\nfabricated via the compression molding technique, which limits their\npractical application. In this work, the injection molding technique\nwas utilized for the first time to develop a carbon nanotube (CNT)/isotactic\npolypropylene (iPP)/atactic polypropylene (aPP) composite with typical\nsegregated structure. The injection molded segregated CNT/PP composite\nexhibits an excellent EMI SE of 43.1 dB, which is 67% higher than\nthe CNT/PP composite with randomly distributed CNTs, at the same CNT\nloading of 5.0 wt %. Such EMI SE is also comparable to the value for\nsegregated CNT/PP composites prepared by compression molding. Our\nwork provides a promising strategy to develop segregated CPCs via\nan efficient injection molding technique, in comparison to the compression\nmolding technique.