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Physical aging and the creep behavior of acrylic bone cements
Author(s) -
Kuzmychov Oleksii,
Koplin Christof,
Jaeger Raimund,
Büchner Hubert,
Gopp Udo
Publication year - 2009
Publication title -
journal of biomedical materials research part b: applied biomaterials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.665
H-Index - 108
eISSN - 1552-4981
pISSN - 1552-4973
DOI - 10.1002/jbm.b.31474
Subject(s) - creep , materials science , composite material , context (archaeology) , geotechnical engineering , geology , paleontology
The creep deformation of two acrylic bone cements, Palacos® R+G and SmartSet® GHV, was investigated for different physical aging times ranging from 45 min to 2 ½ years. The experiments were carried out in a three‐point‐bending set‐up in 37°C Ringer's solution applying 10 MPa or 25 MPa creep loads. Both bone cements exhibit a significant decrease of their creep compliance with increasing physical aging time. The experimental data were analyzed with a creep law discussed in the context of physical aging by Struik, and a modified Burgers' model which can be used to separate the strain response of the bone cements into an elastic, a visco‐elastic and a creep component. The creep behavior of the bone cements could be described essentially with only one parameter of Struik's creep law. The analysis with the modified Burgers' model showed that physical aging influences all model parameters which are directly related to the mobility of the polymer chains. The effect of physical aging should be taken into account particularly if the mechanical performance of bone cements shortly after curing is investigated. © 2009 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 2009