Effect of process engineering on the performance of natural fiber reinforced cellulose acetate biocomposites
Effect of process engineering on the performance of natural fiber reinforced cellulose acetate biocomposites
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DOI：
10.1016/j.compositesa.2003.09.015
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发表时间：
2004-01-01
影响因子：
8.7
通讯作者：
Drzal, LT
中科院分区：
文献类型：
--
作者：
Mohanty, AK;Wibowo, A;Drzal, LT
以麻碎纤维和纤维素酯可生物降解塑料为原料，通过粉末浸渍压缩成型（工艺1）和挤压成型后注射成型（工艺11）两种工艺工程方法制备了环保绿色/生物复合材料。纤维素酯，如醋酸纤维素（CA）与30%柠檬酸增塑剂（CAP）增塑剂被用作生物复合材料的基质聚合物。由于在过程11中经历的剪切力的紧密混合，产生了比使用过程1的同类材料更高强度的生物复合材料。通过H工艺制备的含有30 wt%大麻天然纤维的生物复合材料比原始基质聚合物的存储模量提高了150%。与原始生物塑料相比，该生物复合材料的热膨胀系数降低了60%，而热偏转温度提高了30%，表明该生物复合材料具有优越的热性能。由于极性纤维素酯与极性天然纤维具有更好的相互作用，因此证明增塑醋酸纤维素是一种比非极性聚丙烯（PP）更好的麻纤维增强材料。通过工艺11和相同含量的大麻（30 wt%）制备的CAP-HF基生物复合材料的抗弯强度为78 MPa，弹性模量为5.6 GPa，而相应的PP-HF基复合材料的弹性模量为55 MPa和3.7 GPa。利用混合规律将生物复合材料的拉伸模量与理论模量进行了比较。通过环境扫描电镜研究评价了纤维-基质的粘附性。(C) 2003, Elsevier Ltd.出版
Eco-friendly green/biocomposites were fabricated from chopped hemp fiber and cellulose ester biodegradable plastic through two process engineering approaches: powder impregnation through compression molding (process 1) and extrusion followed by injection molding (process 11). Cellulose ester, e.g. cellulose acetate (CA) plasticized with 30 wt% citrate plasticizer (CAP) was used as the matrix polymer for biocomposite fabrication. Intimate mixing due to shear forces experienced in process 11 produced superior strength biocomposites over their counterparts made using process 1. Biocomposite fabricated through process H containing 30 wt% hemp natural fiber showed an improvement of storage modulus by 150% over the virgin matrix polymer. The coefficient of thermal expansion of the said biocomposite decreased from the CAP polymer by 60% whereas the heat deflection temperature improved by 30% versus the virgin bioplastic, indicating superior thermal behavior of the biocomposite. Plasticized cellulose acetate is proved to be much better matrix than non-polar polypropylene (PP) for hemp fiber (HF) reinforcements because of the better interaction of polar cellulose ester with the polar natural fiber. Fabricated through process 11 and with same content of hemp (30 wt%) the CAP-HF based biocomposite exhibited flexural strength of 78 MPa and modulus of elasticity of 5.6 GPa as contrast to 55 MPa and 3.7 GPa for the corresponding PP-HF based composite. The experimental findings of tensile modulus of the biocomposites are compared with the theoretical modulus using the rule of mixture. The fiber-matrix adhesion is evaluated through environmental scanning electron microscopy studies. (C) 2003 Published by Elsevier Ltd.