Carbon fiber (CF) is a difficult material to recycle, generating accumulation and environmental impacts when disposed of incorrectly. The practice of reuse is being encouraged, aiming to minimize socio-environmental impacts. The present research aimed to develop polypropylene (PP) composites with CF waste, using styrene-(ethylene-butylene)-styrene grafted with maleic anhydride (SEBS-MA) and ethylene-propylene-diene grafted with maleic anhydride (EPDM-MA), as compatibilizers. The composites were processed in a mixer and injection molded. The addition of the CF in the PP matrix did not hinder processability, as verified in torque rheometry. Significant increases were achieved in impact strength and elongation at break, especially in the PP/FC/SEBS-MA and PP/FC/EPDM-MA composites. Incorporating 15% EPDM-MA reduced the elastic modulus and tensile strength by 23% and 32%, while SEBS-MA by 13% and 23%, relative to PP, respectively, due to the increase in flexibility of the composites. When the PP/FC composites were compatibilized with SEBS-MA and EPDM-MA, there was a higher level of interaction among the phases, generating a higher wettability, as verified in the scanning electron microscopy. Such behavior was important to increase the crystallinity of the compatibilized composites. The composites thermal stability increased significantly, increasing in 40°C, compared to pure PP. In general, the compatibilization with SEBS-MA was more effective, generating better properties. As a consequence, the heat deflection temperature of the composites remained the same as the level of pure PP, suggesting good structural stability. The results are valuable for the recycling area, since CF can be reused as a polymer additive to improve properties.

中文翻译：

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再利用碳纤维废料生产聚丙烯复合材料。苯乙烯-(乙烯-丁烯)-苯乙烯接枝马来酸酐和乙烯-丙烯-二烯接枝马来酸酐共聚物的影响

碳纤维 (CF) 是一种难以回收的材料，如果处理不当会产生堆积和环境影响。鼓励再利用的做法，旨在尽量减少社会环境影响。本研究旨在开发聚丙烯 (PP) 复合材料与 CF 废物, 使用苯乙烯-(乙烯-丁烯)-苯乙烯接枝马来酸酐 (SEBS-MA) 和乙烯-丙烯-二烯接枝马来酸酐 (EPDM-MA),作为增容剂。复合材料在混合器中加工并注塑成型。正如在扭矩流变学中所证实的那样，在 PP 基体中添加 CF 不会影响加工性能。冲击强度和断裂伸长率显着提高，尤其是在 PP/FC/SEBS-MA 和 PP/FC/EPDM-MA 复合材料中。由于复合材料的柔韧性增加，相对于 PP，加入 15% 的 EPDM-MA 使弹性模量和拉伸强度分别降低了 23% 和 32%，而 SEBS-MA 分别降低了 13% 和 23%。当 PP/FC 复合材料与 SEBS-MA 和 EPDM-MA 相容时，相之间有更高水平的相互作用，产生更高的润湿性，如扫描电子显微镜所示。这种行为对于增加相容复合材料的结晶度很重要。与纯 PP 相比，复合材料的热稳定性显着增加，在 40°C 时增加。一般来说，与 SEBS-MA 的相容性更有效，产生更好的性能。因此，复合材料的热变形温度与纯 PP 的水平保持相同，表明具有良好的结构稳定性。