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

Tetsuo Takayama; Mitsugu Todo

doi:10.1007/s10853-009-3782-3

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

Tetsuo Takayama, Mitsugu Todo

Renewable Energy Center

Research output: Contribution to journal › Article

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 language	English
Pages (from-to)	5017-5020
Number of pages	4
Journal	Journal of Materials Science
Volume	44
Issue number	18
DOIs	https://doi.org/10.1007/s10853-009-3782-3
Publication status	Published - Sep 1 2009

All Science Journal Classification (ASJC) codes

Materials Science(all)
Mechanics of Materials
Mechanical Engineering

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Takayama, T., & Todo, M. (2009). Improvement of mechanical properties of hydroxyapatite particle-filled poly(l-lactide) biocomposites using lysine tri-isocyanate. Journal of Materials Science, 44(18), 5017-5020. https://doi.org/10.1007/s10853-009-3782-3

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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.",

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N2 - 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.

AB - 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.

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