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Effects of mixing on electrical properties of carbon nanofiber and polymer composites
Author(s) -
Lee Sungho,
Jeon YoungPyo
Publication year - 2009
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.30381
Subject(s) - materials science , composite material , carbon nanofiber , percolation threshold , linear low density polyethylene , mixing (physics) , dispersion (optics) , breakage , percolation (cognitive psychology) , nanofiber , electrical resistivity and conductivity , polymer , carbon nanotube , physics , engineering , optics , quantum mechanics , neuroscience , electrical engineering , biology
We examined electrical properties of composites of carbon nanofibers (CNFs)/linear low‐density polyethylene (LLDPE) in the range of mixing time. An addition of CNFs into LLDPE led to a decrease of electrical resistivity, and the large amounts of CNFs were required to reach the electrical percolation threshold for the longer mixing time. For the research of these phenomena, we examined the effects of mixing time on the size (length) and spatial distributions of CNFs in the composites. SEM micrographs revealed the size reduction of CNFs in a series of mixing times, although the spatial dispersion of CNFs became more uniform at longer mixing time. To describe the reduction of CNFs theoretically, we hypothesize the size distribution of CNFs obeys a governing population balance kinetics based on an irreversible dissolution process. For the process, we proposed a size dependent breakage rate coefficient proportional to the size of CNFs. The model prediction for the time evolution of size distribution of CNFs has been validated with the experimental measurement showing good agreement. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009