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Mechanical Properties, Morphology And Thermal Degradation Of A Biocomposite Of Polypropylene And Curaua Fibers: Coupling Agent Effect

机译:聚丙烯和Curuaa纤维生物复合材料的力学性能,形态和热降解:偶联剂效应

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摘要

Biocomposites of polymers with vegetal fibers have a broad spectrum of applications due to their high specific properties in comparison to their counterparts made with fiberglass. Polypropylene, PP, composites with curaua fiber compatibilized with different concentrations of maleic anhydride grafted polypropylene, PP-g-MA, were characterized according to their mechanical properties, morphologies and thermal stabilities in oxidative and inert atmospheres. The composites were prepared by single screw extrusion and injection molded specimens were used for testing. The composite with 20 wt % of curaua fiber with and without compatibilizer presented improved mechanical properties compared to pure PP. The use of PP-g-MA as a compatibilizer significantly increased fiber/matrix adhesion, however, the mechanical properties were only slightly improved in comparison with composites without compatibilizer. We observed an improvement in thermal stability of the composites, compared to that expected from the weighted average of the individual components, both under inert and oxidative atmospheres. Furthermore, the thermal stability improved under inert atmosphere as a function of the concentration of compatibilizer. In this situation, indeed, there was a different shift of the weight loss processes owing to the presence of the compatibilizer.
机译:具有植物纤维的聚合物的生物复合材料由于其与玻璃纤维制成的同类产品相比具有较高的比特性而具有广泛的应用范围。根据其力学性能,形貌和在氧化性和惰性气氛中的热稳定性,表征了具有不同浓度马来酸酐接枝聚丙烯PP-g-MA的,具有姜脂纤维的聚丙烯PP复合材料。通过单螺杆挤出制备复合材料,并使用注塑样品进行测试。与纯PP相比,具有和不具有增容剂的具有20重量%的姜黄纤维的复合材料表现出改善的机械性能。 PP-g-MA作为增容剂的使用显着提高了纤维/基质的粘合力,但是,与不添加增容剂的复合材料相比,其机械性能仅略有改善。与在惰性和氧化气氛下单个成分的加权平均值所期望的相比,我们观察到复合材料的热稳定性有所提高。此外,作为增容剂浓度的函数,在惰性气氛下的热稳定性得到改善。实际上,在这种情况下,由于增容剂的存在,减肥过程发生了不同的变化。

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