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Effect of Calcification on The Fatigue Behavior of Fluorinated Polyurethanes

Published online by Cambridge University Press:  10 February 2011

R. S. Benson  and
H. J. Kim
R. S. Benson
Affiliation:
Materials Science and Engineering, University of Tennessee, Knoxville, TN 37996–2200
H. J. Kim
Affiliation:
Materials Science and Engineering, Kungju University, Kongju, KOREA
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Abstract

The present study compares the fatigue propagation behavior of a fluorinated and nonfluorinated polyurethane-calcium salt blends. The calcium salts used in this study are calcium chloride and hydroxyapatite (HAP). The fatigue crack propagation (FCP) behavior of the polyurethanes exhibited a dependence on the chemical composition of the polymer and calcium salt. The pure non-fluorinated PTMG2000 did no undergo crack propagation. While the fluorinated PTMG2003F exhibit a crack propagation rate of 7.8 × 10-6 m/cycle at constant strain amplitude and tearing energy range. The incorporation of calcium chloride into PTMG2000 did not promote any changes in the FCP behavior; while the addition of HAP produced cracks with a growth rate of 3.33 × 10-6 m/cycle. In the case of PTMG2003F, the addition of calcium chloride did not lead to formation of cracks; while HAP produced a material in which cracks propagated at a rate of 10.0 × 10-6 m/cycle. The difference in the response the non-fluorinated and fluorinated polyurethane-calcium salt blends to cyclic loading can be attributed to molecular level variations such as domains disruption and changes in chain orientation at the crack tip.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 599: Symposium DD – Mineralization in Natural & Synthetic Biomaterials , 1999 , 281
Copyright
Copyright © Materials Research Society 2000

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