The dynamic viscoelastic properties of polypropylene (PP)–maleated PP blends in the molten state have been investigated with a dynamic mechanical thermal analyzer (PL-DMTA MKII) at a frequency range (ω) of 0.6 ∗︁ 10−1–3.14 ∗︁ 102 rad s−1. In the study, the blends were prepared by melt-blending in a twin-screw extruder, using homopolypropylene and an ethylene–propylene copolymer as a matrix, respectively, and PP grafted with maleic anhydride (PP-g-MA) as a second component. It has been found that the data of the blends do not obey the Cox–Merz rule; the plots of log G′–log G" for the both blends show a composition dependence. It is due to the fact that the two kinds of PP are immiscible with PP-g-MA.
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Li et al. (1999) studied this question.