Effect of silane coupling treatment on mechanical properties of porous pure titanium filled with PMMA for biomedical applications

Masaaki Nakai, Mitsuo Niinomi, Toshikazu Akahori, Hideaki Yamanoi, Shinichi Itsuno, Naoki Haraguchi, Yoshinori Itoh, Tadashi Ogasawara, Takashi Onishi, Taku Shindoh

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

As a new type of metallic biomaterial, porous pure titanium filled with a medical polymer has been developed for obtaining a low Young's modulus similar to that of bone. This type of biomaterials will inhibit the deterioration of mechanical properties due to the presence of pores, and provide biofunctionalities that are intrinsically possessed in certain polymers. However, the inhibition of the deterioration of mechanical properties is not satisfactory because of the poor interfacial adhesiveness between the titanium particles and the medical polymer. Therefore, in the present study, silane coupling treatment is employed in order to improve the interfacial adhesiveness, and silane-coupling-treated (Si-treated) porous pure titanium (pTi) filled with polymethylmethacrylate (PMMA) is fabricated. Subsequently, the effect of the silane coupling treatment on the mechanical properties of the pTi filled with PMMA is investigated. The tensile strengths of the Si-treated pTi filled with PMMA are higher than those of pTi and non-Si-treated pTi filled with PMMA. In the fractographs of non-Si-treated pTi filled with PMMA obtained after the tensile test, the detachment of titanium particles from PMMA is observed; this occurs because of poor interfacial adhesiveness between titanium particles and PMMA. However, in the case of the Si-treated pTi filled with PMMA, the interfacial adhesiveness between titanium particles and PMMA is improved by the silane coupling treatment. This leads to the dispersion of the stress concentration at necks between particles, resulting in an improvement in the tensile strength of pTi. On the other hand, PMMA filling hardly affects Young's modulus of pTi because Young's modulus of PMMA is lower than that of pTi.

Original languageEnglish
Pages (from-to)839-845
Number of pages7
JournalNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
Volume72
Issue number10
DOIs
Publication statusPublished - 2008 Oct

Keywords

  • Biomaterial
  • Composite
  • Polymethylmethacrylate (PMMA)
  • Porous titanium
  • Silane coupling
  • Tensile strength
  • Young's modulus

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

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