The fractal behavior in q space of polypropylene with polydecamethylene sebacamide (Nylon1010, PA1010) (90/10 vol%) blends during melt mixing is investigated, where q is the scattering wave vector. The relation between the small-angle laser scattering image and the power spectrum of the binarized scanning electron microscopy image is discussed. Two fractal dimensions, i.e. D1 and D2, are deduced in q space. The results show that the fractal dimensions are effective parameters to characterize the dynamics of the phase dispersion during melt mixing. D1 can be used to characterize the spatial fluctuation of the phase structure. With the increasing D1, the spatial fluctuation of the phase structure becomes bigger. And D2 can directly characterize the dispersion degree of the dispersed phase. Higher phase dispersion degree corresponds to bigger D2. The results indicate that these two fractal dimensions in q space have almost the same changing rule with the increasing mixing time. Both of them change considerably at the initial stage but, are almost unchanged after 2 min, demonstrating that the phase structure mainly forms at the initial stage during melt mixing.
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