壳聚糖纤维填充的酯化木质素改性聚丙烯复合材料的力学和热性能表征

F. Tanjung, R. A. Kuswardani, C. I. Idumah, J. Siregar, A. Karim
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引用次数: 27

摘要

对比研究了酯化碱性木质素(AAL)和酯化有机溶剂木质素(AOSL)作为界面改性剂对聚丙烯-壳聚糖复合材料性能的改善作用。将壳聚糖与酯化木质素在醇介质中进行化学改性。采用内混炼和热压法制备了复合材料。傅里叶变换红外光谱证实,经酯化木质素修饰后,两种改性壳聚糖的化学结构不同。在分子量较低的情况下,AOSL附着在壳聚糖表面的亲水性降低效果更好。拉伸试验表明,与未改性的复合材料相比,aal改性和asl改性复合材料的抗拉强度分别提高了32.15%和26.43%。综上所述,AOSL在提高复合材料的机械强度和热稳定性方面更胜一筹,而AAL在塑性和结晶性方面的提高最为明显。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Characterization of mechanical and thermal properties of esterified lignin modified polypropylene composites filled with chitosan fibers
A comparative study was performed on the use of esterified alkaline lignin (AAL) and esterified organosolv lignin (AOSL) as the interfacial modifying agent to improve the properties of polypropylene-chitosan composites. Chitosan was chemically modified through a reaction with the esterified lignin in an alcohol medium. The composites were prepared using an internal mixer and hot-pressed method. Both modified chitosan showed a different chemical structure upon modification with the esterified lignins as confirmed by Fourier transform infrared spectroscopy spectra. With a lower molecular weight, the AOSL attachment on the chitosan surface resulted in more efficiency in decreasing hydrophilic characters. Tensile tests showed the increased tensile strength by 32.15% and 26.43% for AOSL-modified composites and AAL-modified composites as compared with the unmodified composites. Overall, the AOSL was superior in improving the mechanical strength and thermal stability of the composites, while the AAL exhibited the most apparent enhancement in ductility and crystallization.
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