Dynamic-mechanical properties of wood-fibre reinforced polyactide: experimental characterization and micro-mechanical modelling
2006 (English)In: Journal of Thermoplastic Composite Materials, ISSN 0892-7057, E-ISSN 1530-7980, Vol. 19, no 6, 613-638 p.Article in journal (Refereed) Published
Wood-fiber reinforced polylactide is a biodegradable compositewhere both fibers and matrix are from renewableresources. When designing new materials of this kind, itis useful to measure the influence of fiber–matrixinterface properties on macroscopic mechanicalproperties. In particular, a quantitative measure of thedynamic stress transfer between the fibers andthe matrix when the material is subjected tocyclic loading would simplify the development of wood-fibercomposites. This is obtained by comparing themechanical dissipation of the composite with avalue predicted by a viscoelastic micromechanical model basedon perfect interfacial stress transfer. Theloss factors predicted by the model are 0.12 and 0.16 at dryand humid conditions, respectively, which amountto 63 and 66% of the experimentally determinedvalues. For Young's moduli the predicted values are 1.01 and0.88 GPa, which correspond to 92% of the experimentallydetermined values. The mismatch between thepredicted and experimental values may be attributed toimperfect interfaces with restrained stress transfer.Loss factors are also determined for specificmolecular bonds using dynamic Fourier transform infrared(FT-IR) spectroscopy. These values show the sametrends with regard to moisture content as themacroscopically determined loss factors.
Place, publisher, year, edition, pages
2006. Vol. 19, no 6, 613-638 p.
polylactide • wood fibers • micromechanics • stress transfer • imperfect interfaces • dynamic FT–IR
IdentifiersURN: urn:nbn:se:kth:diva-6991DOI: 10.1177/0892705706067480ISI: 000241384300001ScopusID: 2-s2.0-33750180040OAI: oai:DiVA.org:kth-6991DiVA: diva2:11861
QC 201007142007-04-192007-04-192011-07-13Bibliographically approved