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This study developed strong nanocomposite films using cellulose nanofiber (SCNF) preforms and epoxy resin. Higher porosity SCNF preforms absorbed more resin, enhancing mechanical properties for advanced material applications.

Keywords:
cellulose nanofibersmechanical propertiesmicrostructure characterizationnanocomposites

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Area of Science:

  • Materials Science
  • Polymer Science
  • Nanotechnology

Background:

  • Cellulose nanofiber (CNF) preforms offer a sustainable base for composite materials.
  • Controlling the porosity of CNF preforms is crucial for effective resin impregnation.
  • Epoxy resin is a common matrix material for high-performance composites.

Purpose of the Study:

  • To investigate the impact of solvent-treated cellulose nanofiber (SCNF) preform porosity on epoxy resin impregnation.
  • To evaluate the effect of SCNF preform porosity on the tensile properties of the resulting nanocomposite films.
  • To determine the optimal conditions for achieving superior mechanical properties in SCNF-epoxy nanocomposites.

Main Methods:

  • Preparation of SCNF preforms with controlled porosity via solvent exchange and varying CNF concentrations.
  • Impregnation of SCNF preforms with epoxy resin using a solution dipping-hot press technique.
  • Characterization of resin content and tensile properties (tensile strength, Young's modulus) of the nanocomposite films.

Main Results:

  • SCNF preform porosity was successfully controlled through solvent exchange.
  • Increased SCNF preform porosity led to a higher amount of impregnated epoxy resin.
  • Nanocomposite films exhibited enhanced mechanical properties compared to SCNF preforms alone.
  • Optimal properties were achieved with 1 wt% SCNF preform and low-viscosity epoxy, yielding 77 MPa tensile strength and 4.8 GPa Young's modulus.
  • A high fiber volume fraction exceeding 60% was observed in the best-performing composite.

Conclusions:

  • SCNF preform porosity is a key parameter influencing resin uptake and mechanical performance in nanocomposites.
  • The developed SCNF-epoxy nanocomposite films demonstrate significant potential for applications requiring high mechanical strength.
  • The study highlights a viable method for producing advanced nanocomposites with tailored properties.