| Summary: | By considering that the α relaxation related to the glass to rubber transition (obtained by dynamic mechanical analysis) of isotactic polypropylene (iPP) can be identified with the thermal history of the material (and so, with the processing step), this work deals with the changes in this transition temperature (Tα) in polypropylene/mica composites caused by the mutual effect of the other components (mica and interfacial additive). Here, the additive used is a <i>p</i>-phenylen-bis-maleamic grafted atactic polypropylene (aPP-<i>p</i>PBMA) obtained from polymerization wastes (aPP) by the authors. This additive contains 5.0·10<sup>−4</sup> g.mol<sup>−1</sup> (15% <i>w</i>/<i>w</i>) grafted <i>p</i>PBMA. In essence, this article has two different objectives: (1) To observe and discuss the changes in Tα of the polymer matrix (iPP) caused by the combined effect of the other components (mica and aPP-<i>p</i>PBMA); and (2) predicting the values for Tα in terms of both aPP-<i>p</i>PBMA and mica content for whatever composition in the experimental space scanned. This task was undertaken by employing a Box–Wilson experimental design assuming the complex character of the interactions between the components of the iPP/aPP-<i>p</i>PBMA/mica system, which define the ultimate properties of the composite.
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