Abstract
Calcium alginate was reinforced with hydroxyapatite ( HA) particles, whose dimensions were a few micrometres, with mass fraction, m(f), values in the range 0-0.8. Cylindrical samples of these composite materials were subjected to cyclic compression in the frequency range f = 0.001-20 Hz; in these tests a sinusoidal load of amplitude 1 N was applied either side of a static compression of 2 N. Storage and loss moduli, E' and E'', respectively, were found to be independent of particle size; however, E' increased with frequency consistent with the materials undergoing a glass transition. Above frequencies of about 0.05 Hz, E' > E'' for all materials. For each frequency, the dependence of the moduli on log(10) f could be represented by a third order polynomial; these equations can be used to calculate E' and E'' for a range of compositions. Approximate values of vertical bar E*vertical bar = root E'(2) + E''(2) are predicted by a Reuss model.
Original language | English |
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Pages (from-to) | 2417-2421 |
Number of pages | 5 |
Journal | Journal of materials science. Materials in medicine |
Volume | 19 |
Issue number | 6 |
DOIs | |
Publication status | Published - 1 Jan 2008 |