Park, Seung Bin Lee, Moo Sung Park, Min 2024-01-20T10:03:07Z 2024-01-20T10:03:07Z 2021-09-05 2014-04 1976-4251 https://pubs.kist.re.kr/handle/201004/126948 Conductive polymer composites (CPCs) consist of a polymeric matrix and a conductive filler, for example, carbon black, carbon fibers, graphite or carbon nanotubes (CNTs). The critical amount of the electrically conductive filler necessary to build up a continuous conductive network, and accordingly, to make the material conductive; is referred to as the percolation threshold. From technical and economical viewpoints, it is desirable to decrease the conductive-filler percolation-threshold as much as possible. In this study, we investigated the effect of polymer/conductive-filler interactions, as well as the processing and morphological development of low-percolation-threshold (Phi c) conductive-polymer composites. The aim of the study was to produce conductive composites containing less multi-walled CNTs (MWCNTs) than required for pure polypropylene (PP) through two approaches: one using various mixing methods and the other using immiscible polymer blends. Variants of the conductive PP composite filled with MWCNT was prepared by dry mixing, melt mixing, mechanofusion, and compression molding. The percolation threshold (Phi c) of the MWCNT-PP composites was most successfully lowered using the mechanofusion process than with any other mixing method (2-5 wt%). The mechanofusion process was found to enhance formation of a percolation network structure, and to ensure a more uniform state of dispersion in the CPCs. The immiscible-polymer blends were prepared by melt mixing (internal mixer) poly(vinylidene fluoride) (PVDF, PP/PVDF, volume ratio 1:1) filled with MWCNT. English SPRINGER JAPAN KK POLYETHYLENE BLENDS BLACK MORPHOLOGY Study on lowering the percolation threshold of carbon nanotube-filled conductive polypropylene composites Article 10.5714/CL.2014.15.2.117 1 CARBON LETTERS, v.15, no.2, pp.117 - 124 CARBON LETTERS 15 2 117 124 scie scopus kci ART001869423 000344198300005 2-s2.0-85000817554 Chemistry, Multidisciplinary Materials Science, Multidisciplinary Chemistry Materials Science Article POLYETHYLENE BLENDS BLACK MORPHOLOGY conductive polymer composite multi-walled carbon nanotube polypropylene