期刊
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN MEDICINE
卷 19, 期 6, 页码 2417-2421出版社
SPRINGER
DOI: 10.1007/s10856-007-3364-3
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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.
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