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Role and sinergy of block copolymer and carbon nanoparticles on toughness in epoxy matrix
Author(s) -
Schuster Marcia B.,
Opelt Carlos V.,
Becker Daniela,
Coelho Luiz A.F.
Publication year - 2018
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.24599
Subject(s) - materials science , composite material , fracture toughness , carbon nanotube , epoxy , agglomerate , nanocomposite , toughness , graphene , surface roughness , nanoparticle , nanotechnology
In this work, the relations between fracture surface roughness in mode I and the content of different carbon nanoparticles, graphene nanoplatelets (GNP) and carbon nanotubes (CNT) were systematically investigated. A block copolymer (BC) was also used to aid the dispersion process considering its role on fracture toughness. Both K Ic and G Ic were found to increase significantly with the addition of a BC along with carbon nanoparticles. Roughness measurements showed that the value of surface roughness ( R a ) does not depend on the toughness, and decreases as the precrack distance increases. In the system with the greatest amount of graphene (0.5 wt%), the agglomerates impaired the material's tenacity and crack deflection with GNP delamination as the fracture mechanism. As for the CNT/epoxy nanocomposites with the BC, strong adhesion between matrix and nanotubes prevented debonding, so the CNTs break, rather than pulling out, after crack bridging, the so called sliding‐fracture mode failure. POLYM. COMPOS., 39:E2262–E2273, 2018. © 2017 Society of Plastics Engineers