Role and sinergy of block copolymer and carbon nanoparticles on toughness in epoxy matrix

Marcia B. Schuster; Carlos V. Opelt; Daniela Becker; Luiz A.F. Coelho

doi:10.1002/pc.24599

journal article·2018-12Open access

Role and sinergy of block copolymer and carbon nanoparticles on toughness in epoxy matrix

Marcia B. Schuster, Carlos V. Opelt, Daniela Becker, Luiz A.F. Coelho

Polymer Composites· Volume 39· Issue S4

Publisher page Open full text

Source abstract

Abstract

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

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Research context

Nanomaterials

OpenAlex topics: Polymer Nanocomposites and Properties · Epoxy Resin Curing Processes · Polymer crystallization and properties

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Universidade do Estado de Santa Catarina, Pós‐Graduação em Ciência e Engenharia de Materiais, Rua Paulo Malschitzki, Campus Avelino Marcante Joinville Santa Catarina 89223‐100 Brazil

Divisão de Engenharia Mecânica, Praça Mal. Eduardo Gomes, 50, Vila das Acácias, São José dos Campos Instituto Tecnológico de Aeronáutica São Paulo 12228‐900 Brazil

Funding

Conselho Nacional de Desenvolvimento Científico e Tecnológico · CNPq

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