Mechanical properties of functional alumina/polyurethane biocomposite

Zbigniew Jaegermann 1Anna Boczkowska 2Agata Domańska 2Sławomir Michałowski 1

1. Institute of Glass, Ceramics, Refractory and Construction Materials (ISC), Postepu 9, Warszawa 02-676, Poland
2. Warsaw University of Technology, Faculty of Materials Science and Engineering (InMat), Wołoska 141, Warszawa 02-507, Poland

Abstract

The purpose of the research consists in obtaining and testing gradient ceramics/polymer biocomposite. It could be used for design and future production of small joints endoprosthesis parts. The material should fulfill at least three functions which determine the usefulness of prosthesis: load bearing function, fastening and stabilizing endoprosthesis to the bone and tribologic function allowing mating with another parts of the joint or prosthesis.

Samples of alumina foams were formed by polymeric sponge method using structural sponges of different pore per inch density. During the mapping process of alumina foams a 3D structure of interconnected posts was built. Structures of different size of spaces between posts and differing total porosity can be obtained by the selection of polyurethane sponges types.

Degradable polyurethanes based on poly(e-caprolactone)diol and 4,4`-diisocyanate dicycloheksymethane were made. As chain extenders two different agents were used: ethylene glycol (EG) and water. Advantage of the polymer made from water as a chain extender is its long pot-life and low viscosity before curing as well as very good physical and mechanical properties in comparison to polymer made from EG as a chain extender. The alumina/polymer composite is characterized by much higher compressive strength than alumina foam itself. The compressive strength of the composite depends on the polymer composition used for the infiltration of alumina foams.

Polyurethanes characterized by good wear resistance, based on 4,4`-diisocyanate dicycloheksymethane and polytetramethylene ether glycol (PTMEG) were also prepared.

Results show that it is possible to obtain functional alumina/polyurethane composite, which could fulfill requirements for the material used for manufacturing of joint endoprosthesis parts.

This work is financed by Polish Ministry of Science and Higher Education (grant nr 3 T08D 03129)

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Presentation: Poster at E-MRS Fall Meeting 2008, Symposium I, by Zbigniew Jaegermann
See On-line Journal of E-MRS Fall Meeting 2008

Submitted: 2008-05-21 12:57
Revised:   2009-06-07 00:48
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