標題: Influence of the aspect ratio of bioactive nanofillers on rheological behavior of PMMA-based orthopedic materials
作者: Liu, TY
Chen, SY
Liu, DM
材料科學與工程學系
Department of Materials Science and Engineering
關鍵字: rheology;nanoneedle particle;aspect ratio;solid loading;hydroxyapatite;PMMA
公開日期: 15-十月-2004
摘要: In this investigation, calcium-deficient hydroxyapatite (CDHA) nanocrystals with needle-like geometry were synthesized and incorporated with Poly(methyl methacrylate), PMMA, to form CDHA-PMMA nanocomposites. Rheological behaviors of the PMMA-CDHA melting suspensions were systematically investigated in terms of solid loading and aspect ratio of the CDHA nanoparticles. The maximum solid loadings of nano-CDHA particles with aspect ratios of 7.2, 10.4, and 17 were determined to be 28, 31, and 57%, respectively. An increase in solid concentrations causes pronounced shear-thinning behavior. This result suggests that a strong interaction, including Van der Waals attraction and mechanical interlocking, between the nano-CDHA particles makes the nanocomposite mixture more non-Newtonian. Furthermore, it was found that packing efficiency and yield strength in the suspension were strongly influenced by the aspect ratio, especially above the critical value of 8.8. The obtained critical aspect ratio and solid content provide not only appropriate design in the PMMA-CDHA polymeric suspension for fabrication process but also optimal conditions for the fabrication of orthopedic devices via injection molding or extrusion. (C) 2004 Wiley Periodicals, Inc.
URI: http://dx.doi.org/10.1002/jbm.b.30072
http://hdl.handle.net/11536/25756
ISSN: 0021-9304
DOI: 10.1002/jbm.b.30072
期刊: JOURNAL OF BIOMEDICAL MATERIALS RESEARCH PART B-APPLIED BIOMATERIALS
Volume: 71B
Issue: 1
起始頁: 116
結束頁: 122
顯示於類別:期刊論文


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  1. 000224190500015.pdf