Mechanical Behaviour of Interpenetrating Co-Continuous β-TCP-PDLLA Composites


Article Preview

Co-continuous degradable polymer-ceramic composites were produced via in-situ polymerization of (D,L-lactic)acid monomer within a porous β-tricalcium phosphate matrix. The mechanical properties of both the composite and the unfilled porous ceramic were investigated with compressive testing. The average stress to failure increased from 1.3±0.1 MPa for the unfilled ceramic matrix to 82±2 MPa for the composite. The Young’s modulus increased from approximately 20 MPa to 700±42 MPa. A combination of X-ray micro-tomography and mechanical testing provided insight into the failure mechanisms of the composite. Stress may be deflected by crack bridging around the polymer phase leading to debonding of the polymer along the crack lines.



Key Engineering Materials (Volumes 361-363)

Main Theme:

Edited by:

Guy Daculsi and Pierre Layrolle




L. M. Ehrenfried et al., "Mechanical Behaviour of Interpenetrating Co-Continuous β-TCP-PDLLA Composites", Key Engineering Materials, Vols. 361-363, pp. 407-410, 2008

Online since:

November 2007




[1] Bonfield, W., M.D. Grynpas, and A.E. Tully, Hydroxyapatite reinforced polyethylene - a mechanically compatible implant material for bone replacement. Biomaterials, 1981. 2: pp.185-186.


[2] Farrar, D.F., et al., Tissue Repair and Replacement, in Patent Application Publication, B. Fish & Richardson PC, MA, Editor. 2005: US. p.11.

[3] Takeoka, Y., et al. Fabrication of biodegradable polymer/hydroxyapatite hybrid materials. in 7th World biomaterials Congress. 2004. Sydney: Australian Society for Biomaterials.

[4] Aizawa, M., et al. Development of porous tricalcium phosphate ceramics from calciumphosphate fibers for a matrix of biodegradable ceramics/ polymer hybrids. in 7th World biomaterials Congress. 2004. Sydney: Australian Society for Biomaterials.

[5] Jin, H.H., et al., Synthesis of biodegradable beta-TCP/PLGA composites using microwave energy, in Eco-Materials Processing & Design Vii. 2006. pp.758-761.

[6] Miao X, et al., Preparation and characterization of interpenetrating phased TCP/HA/PLGA composites. Materials letters, 2005. 59.


[7] Weibull, W., A statistical distribution function of wide applicability. Journal of Applied Mechanics, 1951. 18: pp.293-297.

[8] Gibson, L.J. and M.F. Ashby, Cellular Solids. 2nd ed. 1997, Cambridge: Cambridge University Press.

[9] Nakahira A, et al., Fracture behaviour and biocompatibility evaluation of nylon-infiltrated porous HA. Journal of Materials Science, 2002. 37: pp.4425-4430.