Assessing the flexural properties of epoxy composites with extremely low addition of cellulose nanofiber content

Yingmei Xie, Hiroki Kurita, Ryugo Ishigami, Fumio Narita

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

Epoxy resins are a widely used common polymer due to their excellent mechanical properties. On the other hand, cellulose nanofiber (CNF) is one of the new generation of fibers, and recent test results show that CNF reinforced polymers have high mechanical properties. It has also been reported that an extremely low CNF addition increases the mechanical properties of the matrix resin. In this study, we prepared extremely-low CNF (~1 wt. %) reinforced epoxy resin matrix (epoxy-CNF) composites, and tried to understand the strengthening mechanism of the epoxy-CNF composite through the three-point flexural test, finite element analysis (FEA), and discussion based on organic chemistry. The flexural modulus and strength were significantly increased by the extremely low CNF addition (less than 0.2 wt. %), although the theories for short-fiber-reinforced composites cannot explain the strengthening mechanism of the epoxy-CNF composite. Hence, we propose the possibility that CNF behaves as an auxiliary agent to enhance the structure of the epoxy molecule, and not as a reinforcing fiber in the epoxy resin matrix.

Original languageEnglish
Article number1159
JournalApplied Sciences (Switzerland)
Volume10
Issue number3
DOIs
Publication statusPublished - 2020 Feb 1

Keywords

  • Cellulose nanofiber
  • Epoxy resin
  • Finite element method
  • Flexural test

ASJC Scopus subject areas

  • Materials Science(all)
  • Instrumentation
  • Engineering(all)
  • Process Chemistry and Technology
  • Computer Science Applications
  • Fluid Flow and Transfer Processes

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