Characterization of recycled and virgin polyethylene terephthalate composites reinforced with modified kenaf fibers for automotive application
Characterization of recycled and virgin polyethylene terephthalate composites reinforced with modified kenaf fibers for automotive application
复制标题
汽车用改性洋麻纤维增强的回收和原生聚对苯二甲酸乙二醇酯复合材料的表征
DOI：
10.1002/pc.26866
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发表时间：
2022
影响因子：
5.2
通讯作者：
U. Ishiaku
中科院分区：
文献类型：
--
作者：
M. M. Owen;E. O. Achukwu;A. Hazizan;A. Z. Romli;U. Ishiaku
目前的研究是利用废旧再生塑料再生聚对苯二甲酸乙二醇酯（RPET）瓶为基体，与化学改性的天然红麻纤维复合，在相同的加工条件下，与未加工的聚对苯二甲酸乙二醇酯（PET）复合材料进行比较，生产出汽车用工程塑料复合材料。采用碱涂法和环氧涂层法对红麻纤维进行表面改性。机械回收的废弃RPET瓶使用5毫米孔径粉碎成片状，并与10 wt%的短红麻纤维在双螺杆挤出机中熔融混合，并在240°С优化温度下压缩成型。对RPET、原生PET （VPET）及其组成的红麻复合材料进行了力学和热分析。采用扫描电镜（SEM）对复合材料的形貌特征进行了表征。结果表明，处理后的复合材料（TKF/RPET和TKF/VPET）均比未处理的复合材料（KF/RPET和KF/VPET）具有更高的力学性能。RPET及其组分复合材料比VPET复合材料具有更高的冲击性能。然而，VPET复合材料的拉伸和弯曲强度高于再生RPET复合材料。RPET和VPET的熔融峰温度分别为252.9°C和245.8°C。与未处理的复合材料相比，处理后的TKF/RPET和TKF/VPET复合材料都具有更高的热稳定性和分解温度。SEM结果显示，与未经处理的复合材料相比，两种处理过的复合材料具有很强的纤维/基质粘附性，没有明显的纤维降解证据。可以得出结论，RPET具有与原始PET相似的热性能，可以作为复合配方中原始PET的替代品。
The current research has produced engineering plastics composite for automotive applications using waste recycled plastic recycled polyethylene terephthalate (RPET) bottles as the matrix and compounded with chemically modified natural kenaf fibers in comparison with virgin polyethylene terephthalate (PET) composites under the same processing conditions. Kenaf fibers were surface modified by alkali and epoxy coating treatment methods. The waste RPET bottles which were mechanically recycled were pulverized using a 5 mm mesh size aperture into flakes and melt‐mixed with 10 wt% of short kenaf fibers in a twin‐screw extruder and compression‐molded at 240°С optimized temperature. Mechanical and thermal analyses were performed on both RPET, virgin PET (VPET), and their constituent kenaf composites. Scanning electron microscopy (SEM) was carried out to assess the composite's morphological characteristics. The results show that both treated (TKF/RPET and TKF/VPET) composites gave higher mechanical properties compared to untreated (KF/RPET and KF/VPET) composites. RPET and its constituent composites show higher impact properties than VPET composites. However, the tensile and flexural strength of VPET composites was higher than that of recycled RPET composites. RPET and VPET showed melting peak temperatures of 252.9°C and 245.8°C respectively. Both treated TKF/RPET and TKF/VPET composites were more thermally stable and decomposed at higher temperatures compared to the untreated composites. The SEM results for both treated composites showed a strong fiber/matrix adhesion with no clear evidence of fiber degradation as compared to untreated composites. It can be concluded that RPET possessed similar thermal properties compared to its virgin counterpart and can serve as a substitute for virgin PET in the composite formulation.