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Effect of porosity and pore size on microstructures and mechanical properties of poly-epsilon-caprolactone- hydroxyapatite composites.

Abstract

The influence of variant pore-size and porosity on the microstructure and the mechanical properties of poly-epsilon-caprolactone (PCL) and hydroxyapatite (HA) composite were examined for an optimal scaffold in bone tissue engineering. Three various amounts of sodium chloride (NaCl, as porogens) with two distinct particle size ranges (212-355 mum and 355-600 mum) were blended into PCL and HA mixture, followed by a leaching technique to generate PCL-HA scaffolds with various pores and porosity. The porosities of the scaffolds were correlated with the porogen size and concentration. The morphological properties of the resulting scaffolds were assessed by micro-computerized tomography (muCT), scanning electron microscopy (SEM), and energy dispersive X-ray analysis (EDX). Extensive PCL-HA pore interconnections with thinner pore walls were present in scaffolds with higher concentration (4:1 w/w) and larger particulate of porogen used in the fabrication process. Embedding of HA particles in the scaffold resulted in rough surfaces on the composites. Instron actuator testing indicated that the tensile strengths and Young's moduli of scaffolds were influenced by both the porosities and pore sizes of the scaffold. It was apparent that increasing the concentration of porogen compromised the mechanical properties; and a larger porogen particle size led to increased tensile strength but a reduction in Young's modulus. Overall, the data indicated that modification of the concentration and particle size of porogen altered the porous features and mechanical strength of HA-PCL scaffolds. This provided means to manipulate the properties of biocompatible cell-supporting scaffolds for use as bone graft substitutes.

Authors+Show Affiliations

Department of Biomedical Engineering, Wayne State University, Detroit, Michigan, USA.No affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

18335434

Citation

Yu, Haiying, et al. "Effect of Porosity and Pore Size On Microstructures and Mechanical Properties of Poly-epsilon-caprolactone- Hydroxyapatite Composites." Journal of Biomedical Materials Research. Part B, Applied Biomaterials, vol. 86, no. 2, 2008, pp. 541-7.
Yu H, Matthew HW, Wooley PH, et al. Effect of porosity and pore size on microstructures and mechanical properties of poly-epsilon-caprolactone- hydroxyapatite composites. J Biomed Mater Res Part B Appl Biomater. 2008;86(2):541-7.
Yu, H., Matthew, H. W., Wooley, P. H., & Yang, S. Y. (2008). Effect of porosity and pore size on microstructures and mechanical properties of poly-epsilon-caprolactone- hydroxyapatite composites. Journal of Biomedical Materials Research. Part B, Applied Biomaterials, 86(2), pp. 541-7. doi:10.1002/jbm.b.31054.
Yu H, et al. Effect of Porosity and Pore Size On Microstructures and Mechanical Properties of Poly-epsilon-caprolactone- Hydroxyapatite Composites. J Biomed Mater Res Part B Appl Biomater. 2008;86(2):541-7. PubMed PMID: 18335434.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Effect of porosity and pore size on microstructures and mechanical properties of poly-epsilon-caprolactone- hydroxyapatite composites. AU - Yu,Haiying, AU - Matthew,Howard W, AU - Wooley,Paul H, AU - Yang,Shang-You, PY - 2008/3/13/pubmed PY - 2008/9/18/medline PY - 2008/3/13/entrez SP - 541 EP - 7 JF - Journal of biomedical materials research. Part B, Applied biomaterials JO - J. Biomed. Mater. Res. Part B Appl. Biomater. VL - 86 IS - 2 N2 - The influence of variant pore-size and porosity on the microstructure and the mechanical properties of poly-epsilon-caprolactone (PCL) and hydroxyapatite (HA) composite were examined for an optimal scaffold in bone tissue engineering. Three various amounts of sodium chloride (NaCl, as porogens) with two distinct particle size ranges (212-355 mum and 355-600 mum) were blended into PCL and HA mixture, followed by a leaching technique to generate PCL-HA scaffolds with various pores and porosity. The porosities of the scaffolds were correlated with the porogen size and concentration. The morphological properties of the resulting scaffolds were assessed by micro-computerized tomography (muCT), scanning electron microscopy (SEM), and energy dispersive X-ray analysis (EDX). Extensive PCL-HA pore interconnections with thinner pore walls were present in scaffolds with higher concentration (4:1 w/w) and larger particulate of porogen used in the fabrication process. Embedding of HA particles in the scaffold resulted in rough surfaces on the composites. Instron actuator testing indicated that the tensile strengths and Young's moduli of scaffolds were influenced by both the porosities and pore sizes of the scaffold. It was apparent that increasing the concentration of porogen compromised the mechanical properties; and a larger porogen particle size led to increased tensile strength but a reduction in Young's modulus. Overall, the data indicated that modification of the concentration and particle size of porogen altered the porous features and mechanical strength of HA-PCL scaffolds. This provided means to manipulate the properties of biocompatible cell-supporting scaffolds for use as bone graft substitutes. SN - 1552-4981 UR - https://www.unboundmedicine.com/medline/citation/18335434/Effect_of_porosity_and_pore_size_on_microstructures_and_mechanical_properties_of_poly_epsilon_caprolactone__hydroxyapatite_composites_ L2 - https://doi.org/10.1002/jbm.b.31054 DB - PRIME DP - Unbound Medicine ER -