Effect of Cellulose Reducing Ends on the Reinforcing Capacity of Powdered Cellulose in Polypropylene Composites
Effect of Cellulose Reducing Ends on the Reinforcing Capacity of Powdered Cellulose in Polypropylene Composites
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DOI：
10.3390/jcs3040098
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发表时间：
2019-11
影响因子：
3.3
通讯作者：
M. Azadfar;M. R. Graham;M. Wolcott
中科院分区：
文献类型：
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作者：
M. Azadfar;M. R. Graham;M. Wolcott
采用熔体共混和后续注射成型的方法制备了粉末纤维素增强(20wt%)聚丙烯复合材料。我们评估了纤维素还原末端对粉末纤维素增强PP复合材料的能力的影响，在样品调理过程中暴露在空气循环中7天。复合材料的拉伸试验以5.08 mm/min的速度进行。傅里叶变换红外光谱揭示了复合材料内部发生的一些变化，表现出-C=O(1744 cm−1)吸收带强度的实际下降。热重分析表明，所制备的复合材料的热行为存在差异，显示出更高的降解起始时间。断裂区的扫描电子显微镜和载荷-拉伸曲线进一步表征了界面纤维素/基质粘附性的发展以及复合材料的脆性和延性行为。结果表明，降低纤维素粉/聚丙烯体系中纤维素还原端的含量，可以提高共混物的热性能和拉伸性能。
Powdered cellulose-reinforced (20 wt%) polypropylene composites were prepared by melt compounding and subsequent injection moldings. We assessed the effect of cellulose reducing ends on the capacity of powdered cellulose to reinforce polypropylene composites after seven days exposure to air circulation during the conditioning of samples. Tensile tests on the composites were performed at 5.08 mm/min. Fourier transform infrared spectroscopy revealed some changes that occurred within the composites by demonstrating a practical decrease in –C=O (1744 cm−1) absorption band intensity. A thermogravimetric analysis indicated differences within the thermal behavior of the prepared composites, showing a higher onset of degradation. Scanning electron microscopy of the fracture areas, together with load–extension curves, further characterized the development of interfacial cellulose/matrix adhesion as well as the brittle and ductile behavior of the composites. The results indicate that the thermal and tensile properties of powdered cellulose/polypropylene are improved by decreasing the amount of cellulose reducing ends in the system.