The dynamic mechanical properties in terms of the storage modulus G', loss modulus G", and loss tangent 6 have been studied for polypropylene-sepiolite composites. The effect of surface treatment on the relaxation spectra has been elucidated, and quantitative values indicating the extent of polymer-filler interaction have been given. Analysis of the results show that the addition of sepiolite leads to a n increase in the values of the modulus, a value of the glass transition temperature lower than that of unf…
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