Effect of random/aligned nylon-6/MWCNT fibers on dental resin composite reinforcement

Alexandre L.S. Borges, Eliseu A. Münchow, Ana Carolina de Oliveira Souza, Takamitsu Yoshida, Pekka K. Vallittu, Marco C. Bottino

Research output: Contribution to journalArticle

25 Scopus citations

Abstract

The aims of this study were (1) to synthesize and characterize random and aligned nanocomposite fibers of multi-walled carbon nanotubes (MWCNT)/nylon-6 and (2) to determine their reinforcing effects on the flexural strength of a dental resin composite.Nylon-6 was dissolved in hexafluoropropanol (10wt%), followed by the addition of MWCNT (hereafter referred to as nanotubes) at two distinct concentrations (i.e., 0.5 or 1.5wt%). Neat nylon-6 fibers (without nanotubes) were also prepared. The solutions were electrospun using parameters under low- (120rpm) or high-speed (6000rpm) mandrel rotation to collect random and aligned fibers, respectively. The processed fiber mats were characterized by scanning (SEM) and transmission (TEM) electron microscopies, as well as by uni-axial tensile testing. To determine the reinforcing effects on the flexural strength of a dental resin composite, bar-shaped (20×2×2mm3) resin composite specimens were prepared by first placing one increment of the composite, followed by one strip of the mat, and one last increment of composite. Non-reinforced composite specimens were used as the control. The specimens were then evaluated using flexural strength testing. SEM was done on the fractured surfaces. The data were analyzed using ANOVA and the Tukey[U+05F3]s test (α=5%).Nanotubes were successfully incorporated into the nylon-6 fibers. Aligned and random fibers were obtained using high- and low-speed electrospinning, respectively, where the former were significantly (p<0.001) stronger than the latter, regardless of the nanotubes[U+05F3] presence. Indeed, the dental resin composite tested was significantly reinforced when combined with nylon-6 fibrous mats composed of aligned fibers (with or without nanotubes) or random fibers incorporated with nanotubes at 0.5. wt%.

Original languageEnglish (US)
Pages (from-to)134-144
Number of pages11
JournalJournal of the Mechanical Behavior of Biomedical Materials
Volume48
DOIs
StatePublished - Aug 1 2015

Keywords

  • Composite resin
  • Fiber reinforcement
  • MWCNT
  • Nanofibers
  • Nylon-6

ASJC Scopus subject areas

  • Biomaterials
  • Biomedical Engineering
  • Mechanics of Materials

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  • Cite this

    Borges, A. L. S., Münchow, E. A., de Oliveira Souza, A. C., Yoshida, T., Vallittu, P. K., & Bottino, M. C. (2015). Effect of random/aligned nylon-6/MWCNT fibers on dental resin composite reinforcement. Journal of the Mechanical Behavior of Biomedical Materials, 48, 134-144. https://doi.org/10.1016/j.jmbbm.2015.03.019