Dynamic mechanical properties of hydroxyapatite-ethylene vinyl acetate copolymer composites

Velayudhan, S., Ramesh, P., Varma, H. K. and Friedrich, K. (2005) Dynamic mechanical properties of hydroxyapatite-ethylene vinyl acetate copolymer composites. Materials Chemistry And Physics, 89 2-3: 454-460. doi:10.1016/j.matchemphys.2004.10.004


Author Velayudhan, S.
Ramesh, P.
Varma, H. K.
Friedrich, K.
Title Dynamic mechanical properties of hydroxyapatite-ethylene vinyl acetate copolymer composites
Journal name Materials Chemistry And Physics   Check publisher's open access policy
ISSN 0254-0584
Publication date 2005-02-15
Sub-type Article (original research)
DOI 10.1016/j.matchemphys.2004.10.004
Open Access Status DOI
Volume 89
Issue 2-3
Start page 454
End page 460
Total pages 7
Place of publication Lausanne
Publisher Elsevier Science Sa
Language eng
Abstract Dynamic mechanical thermal analysis (DMTA) was carried out to explore the dependence of temperature on the viscoelasticity of composites consisting of synthetic hydroxyapatite (HAP) particulate filled ethylene vinyl acetate copolymer (EVA). Two forms of HAP, differing in their surface characteristics and particle size, were used for the study. The freeze-dried HAP (FDHAP) had a mean particle size of 49.18 mum and an irregular surface morphology. In the contrary the spray dried form of HAP (SDHAP) had a mean particle size of 5.84 (m and a spherical morphology. The dynamic mechanical analysis of the composites showed that both, particle size and morphology, had a significant effect on viscoelastic properties. A tremendous increase of the storage modulus was noted with the addition of HAP. Above the T-g of the polymer matrix, the values were marginally higher for the composites containing FDHAP than for those with SDHAP. The damping (tan delta) was found to decrease with the inclusion of HAP. A marginal upper shift in the value of the glass transition temperature (T-g) was observed for the composites fabricated from SDHAP indicating a slightly strong interaction between this HAP and the EVA matrix. (C) 2004 Elsevier B.V. All rights reserved.
Keyword Materials Science, Multidisciplinary
composite materials
cranioplasty
dynamic mechanical analysis
Hip-fractures
Particle-size
Polyethylene
Viscoelasticity
Dependence
Morphology
Impact
Falls
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
Australian Institute for Bioengineering and Nanotechnology Publications
 
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Created: Sat, 26 Jan 2008, 02:25:19 EST