Improvement of mechanical properties of hydroxyapatite particle-filled poly(l-lactide) biocomposites using lysine tri-isocyanate

Tetsuo Takayama, Mitsugu Todo

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

The effect of lysine tri-isocyanate (LTI) addition on the microstructure and the mechanical properties of hydroxyapatite/Poly(L-lactide) (HA/PLLA) composites was studied. HA particles with the size of 5μm were used as filler and HA and PLLA pellets were mixed by the melt-mixer at 190°C. It is found that the crystallinity of PLLA decreases by LTI addition, showing that the crystallization is hindered by crosslinking of PLLA molecules. The maximum load and the corresponding displacement of HA/PLLA/LTI is greater than those of HA/PLLA, indicating the effectiveness of LTI addition for bending m,mechanical behavior. The fracture surface of HA/PLLA is characterized by rough surface with voids that are formed by debonding HA particles from PLLA matrix. The results also show that in HA/PLLA/LTI, PLLA molecular bundles are firmly connected into the surface of the HA particle.

Original languageEnglish
Pages (from-to)5017-5020
Number of pages4
JournalJournal of Materials Science
Volume44
Issue number18
DOIs
Publication statusPublished - Sep 1 2009

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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