mechanical characterization of a novel biodegradable interpenetrating phase composite.
Published: 2004
Language: eng
Number of pages: 147
Description: An interpenetrating phase composite (IPC) of porous calcium polyphosphate (CPP) and polyvinyl acid-carbonate copolymer (PVA-C), forming ionic bonds between phases, was produced as a potential material for forming a biodegradable osteosynthesis device. The effect of varying the porous CPP structure was investigated to optimize the IPC design in terms of initial stiffness and strength. Furthermore, a mechanism explaining the increase observed in bending strength has been proposed. Porous CPP having percentage theoretical densities of 65, 70, 77, and 82% were formed by gravity sintering amorphous CPP powders having particle size ranges of 75--106 mum, 106--150 mum, or 150--250 mum. The bending strength of IPC samples showed as much as a six-fold increase over that of CPP samples with elastic constants ranging from 15.4 to 39.8 GPa. Fracture toughness testing indicated a significant increase in KIC resulting from PVA-C infiltration of the porous CPP (K IC = 1.0 MPa&middot; m1/2).
Notes: Adviser:  Robert Pilliar.

Thesis (M.A.Sc.)--University of Toronto, 2004.

Electronic version licensed for access by U. of T. users.

Source: Masters Abstracts International, Volume: 42-06, page: 2316.

MICR copy on microfiche (2 microfiches).