Nanoparticles of the standard pyrogenic Aerosil 1380 (Degussa) pregrafted by ã-irradiation with styrene were melt-compounded with the general purpose isotactic polypropylene (PP) homopolymer by a single-screw extruder. Storage G¢(w) and loss G²(w) shear moduli of the neat PP (PP-0) and of the nanocomposite with the filler volume content 4.68 % (PP-4.68) were treated to derive the relaxation times spectra h (t) using the NLREG computer program based on Tikhonovs method of non-linear regularisation. Drastic changes in the pattern, and broadening of the h (t) to longer relaxation times for the PP-4.68 were attributed to the onset of plastic yield of a spatial network of filler particles coated with polymer boundary layer, preceding the macroscopic melt flow.
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