Preparation and properties of polypropylene nanocomposites reinforced with exfoliated graphene |
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Authors: | Ji-Eun An Gil Woo Jeon Young Gyu Jeong |
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Institution: | 1.Department of Materials Design Engineering,Kumoh National Institute of Technology,Gumi,Korea |
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Abstract: | We have prepared a series of polypropylene/exfoliated graphene (PP/EG) nanocomposite films via efficient meltcompounding and
compression, and investigated their morphology, structures, thermal transition behavior, thermal stability, electrical and
mechanical properties as a function of EG content. For the purpose, EG, which is composed of disordered graphene platelets
as reinforcing nanoscale fillers, is prepared by the oxidation/exfoliation process of natural graphite flakes. SEM images
and X-ray diffraction data confirm that the graphene platelets of EG are well dispersed in PP matrix for the nanocomposites
with EG contents less than 1.0 wt%. It is found that thermo-oxidative degradation of PP/EG nanocomposites is noticeably retarded
with the increasing of EG content. Electrical resistivity of the nanocomposite films was dramatically changed from ∼1016 to ∼106 Ω·cm by forming electrical percolation threshold at an certain EG content between 1 and 3 wt%. Tensile drawing experiments
demonstrate that yielding strength and initial modulus of PP/EG nanocomposite films are highly improved with the increment
of EG content. |
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