| Summary: | This work deals with the changes of the glass transition temperature (T<sub>g</sub>) of the polymer in polypropylene/mica composites due to the combined and synergistic effect of the reinforcement and the interfacial modifier. In our case, we studied the effect on T<sub>g</sub> of platy mica and an interfacial modifier with <i>p</i>-phenylen-bis-maleamic acid (<i>p</i>PBMA) grafted groups onto atactic polypropylene (aPP-<i>p</i>PBMA). This one contains 5.0 × 10<sup>−4</sup> g·mol<sup>−1</sup> (15% <i>w/w</i>) grafted <i>p</i>PBMA and was previously obtained by the author’s labs by using industrial polymerization wastes (aPP). The objective of the article must be perceived as two-fold. On one hand, the determination of the changes in the glass transition temperature of the isotactic polypropylene phase (iPP) due to both the reinforcement and the agent as determined form the damp factor in DMA analysis. On the other hand, forecasting the variation of this parameter (T<sub>g</sub>) as a function of both the interfacial agent and reinforcement content. For such purposes, and by assuming the complex character of the iPP/aPP-<i>p</i>PBMA/Mica system, wherein interaction between the components will define the final behaviour, a Box–Wilson experimental design considering the amount of mica particles and of interface agent as the independent variables, and the T<sub>g</sub> as the dependent one, has been used. By taking in mind that the glass transition is a design threshold for the ultimate properties of parts based in this type of organic–inorganic hybrid materials, the final purpose of the work is the prediction and interpretation of the effect of both variables on this key parameter.
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