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Hybrid particulate and fibrous injection molded composites: Carbon black/carbon fiber/polypropylene systems
Author(s) -
Drubetski M.,
Siegmann A.,
Narkis M.
Publication year - 2005
Publication title -
polymer composites
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.577
H-Index - 82
eISSN - 1548-0569
pISSN - 0272-8397
DOI - 10.1002/pc.20116
Subject(s) - materials science , composite material , polypropylene , carbon black , composite number , fiber , melt flow index , shear (geology) , polymer , natural rubber , copolymer
The electrical properties of injection molded composite systems based on a polypropylene matrix and two types of carbonaceous fillers—carbon black (CB) and carbon fibers (CF)—were investigated. In addition to conductivity as a function of system compositions, conductivity profiles were studied. Inhomogeneous spatial distribution of CB particles in moldings containing either CB as a single filler or in combination with CF was found. Furthermore, unexpected fiber orientation transverse to the melt flow direction and disappearance of skin‐core orientation pattern, typical for injection molded fiber filled composites, were observed in the two filler samples. An amplification of the shear‐thinning behavior, characteristic for the polypropylene (PP) matrix, imposed by the inhomogeneity of the CB distribution resulting in flattening of the advancing melt front and velocity profile is suggested as underlying the observed phenomena. POLYM. COMPOS., 26:454–464, 2005. © 2005 Society of Plastics Engineers