Ternary hybrid composites of Polypropylene (PP)/Short Glass Fibers (GF)/Hollow Glass Beads (HGB) were prepared using untreated and aminosilane-treated HGB, compatibilized with maleated-PP, and with varying total and relative GF/HGB contents. Static/short-term flexural strength properties data revealed, through lower flexural strength values, that the presence of untreated HGB particles induces to fiber-polymer interfacial decoupling at much higher extent than in the presence of aminosilane-treated HGB particles. This phenomenon is also evident when evaluating the data from displacement-controlled three-point bending fatigue tests. Monitored up to 10⁶ cycles, the analyzed hybrid composites presented distinct performance relative to their fatigue stress relaxation rate: the lower the matrix-reinforcements’ interfacial adhesion, more pronounced the stress relaxation rate as a function of the number of fatigue cycles. Dynamic Mechanical Thermal Analysis (DMTA) results could successfully reveal the hybrid composites behavior at the microstructural level when they were submitted to both static flexural test and fatigue, depending on the degree of interfacial interactions between the polymer matrix of PP and the hybrid reinforcements of GF and HGB (with and without aminosilane surface treatment).

聚丙烯（PP）/短玻璃纤维（GF）/中空玻璃珠（HGB）的三元杂化复合材料是使用未经处理和氨基硅烷处理过的HGB制备的，并与马来酸化PP相容，且总和相对GF / HGB含量不同。静态/短期挠曲强度特性数据通过较低的挠曲强度值显示，与氨基硅烷处理的HGB颗粒相比，未经处理的HGB颗粒的存在导致纤维-聚合物界面解耦的程度要高得多。当评估位移控制的三点弯曲疲劳测试的数据时，这种现象也很明显。监控多达10 ⁶循环，分析的混合复合材料相对于其疲劳应力松弛率表现出不同的性能：基体增强材料的界面粘合性越低，应力松弛率随疲劳循环次数的变化就越明显。动态机械热分析（DMTA）结果可以成功地揭示杂化复合材料在进行静态挠曲测试和疲劳时的微观结构行为，具体取决于PP聚合物基体与GF杂化增强材料之间的界面相互作用程度和HGB（有和没有氨基硅烷表面处理）。