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Investigation of structure-property relationships of polyisobutylene-based biomaterials: Morphology, thermal, quasi-static tensile and long-term dynamic fatigue behavior.
- Source :
-
Journal of the mechanical behavior of biomedical materials [J Mech Behav Biomed Mater] 2012 Jun; Vol. 10, pp. 206-15. Date of Electronic Publication: 2012 Mar 03. - Publication Year :
- 2012
-
Abstract
- This study examines the morphology, thermal, quasi-static and long-term dynamic creep properties of one linear and three arborescent polyisobutylene-based block copolymers (L&#95;SIBS31, D&#95;IBS16, D&#95;IBS27 and D&#95;IBS33). Silicone rubber, a common biopolymer, was considered as a benchmark material for comparison. A unique hysteretic testing methodology of Stepwise Increasing Load Test (SILT) and Single Load Test (SLT) was used in this study to evaluate the long-term dynamic fatigue performance of these materials. Our experimental findings revealed that the molecular weight of polyisobutylene (PIB) and polystyrene (PS) arms [M(n)(PIB(arm)) and M(n)(PS(arm))], respectively had a profound influence on the nano-scaled phase separation, quasi-static tensile, thermal transition, and dynamic creep resistance behaviors of these PIB-based block copolymers. However, silicone rubber outperformed the PIB-based block copolymers in terms of dynamic creep properties due to its chemically crosslinked structure. This indicates a need for a material strategy to improve the dynamic fatigue and creep of this class of biopolymers to be considered as alternative to silicone rubber for biomedical devices.<br /> (Copyright © 2012 Elsevier Ltd. All rights reserved.)
Details
- Language :
- English
- ISSN :
- 1878-0180
- Volume :
- 10
- Database :
- MEDLINE
- Journal :
- Journal of the mechanical behavior of biomedical materials
- Publication Type :
- Academic Journal
- Accession number :
- 22520432
- Full Text :
- https://doi.org/10.1016/j.jmbbm.2012.02.016