The aim of this work was to evaluate the influence of the use of coupling agent (CA) on the properties of thermoplastic composites produced from post-consumer polypropylene (rPP) and malt bagasse fibers (MB) of brewing industry. The CA used was maleic anhydride graft polypropylene copolymer (MAgPP). The study was carried out in two stages: in first step the best concentration of MB fibers was verified, where was varied the fiber contents between 0, 10, 20 and 30% (w/w); in the second step, the best MB concentration evaluated was used with different CA concentrations (0, 1, 3, 5 and 7% w/w). Of the three MB concentrations evaluated as reinforcing filler, the sample with a 30% (w/w) ratio presented 44% lower deformation than the others, presenting better mechanical resistance, although it also presented the highest water absorption. Thus, the 30% MB fiber content was chosen for two step, where the results showed that the PP/MB-30 composite treated with 3% (w/w) CA had a modulus of elasticity 10.3% higher than the same composite without CA, corroborating with the morphological analysis, which indicated better interfacial adhesion between composite components when CA was used. The PP/MB-30 composite treated with 1% (w/w) CA showed the highest thermal stability among all samples.

这项工作的目的是评估偶联剂 (CA) 的使用对由啤酒工业的消费后聚丙烯 (rPP) 和麦芽甘蔗渣纤维 (MB) 生产的热塑性复合材料性能的影响。所用的 CA 是马来酸酐接枝聚丙烯共聚物 (MAgPP)。该研究分两个阶段进行：第一步是验证 MB 纤维的最佳浓度，其中纤维含量在 0、10、20 和 30% (w/w) 之间变化；在第二步中，评估的最佳 MB 浓度与不同的 CA 浓度（0、1、3、5 和 7% w/w）一起使用。在评估为增强填料的三种 MB 浓度中，具有 30% (w/w) 比率的样品的变形比其他样品低 44%，表现出更好的机械阻力，尽管它也表现出最高的吸水率。因此，选择 30% MB 纤维含量进行两步，结果表明用 3% (w/w) CA 处理的 PP/MB-30 复合材料的弹性模量比没有 CA 的相同复合材料高 10.3%，证实形态分析表明，当使用 CA 时，复合材料组分之间的界面粘附性更好。用 1% (w/w) CA 处理的 PP/MB-30 复合材料在所有样品中表现出最高的热稳定性。