Extrusion and mechanical properties of highly filled cellulose fibre-polypropylene composites
Extrusion and mechanical properties of highly filled cellulose fibre-polypropylene composites
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DOI：
10.1016/j.compositesa.2007.03.004
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发表时间：
2007-01-01
影响因子：
8.7
通讯作者：
Oksman, Kristiina
中科院分区：
文献类型：
--
作者：
Bengtsson, Magnus;Le Baillif, Marie;Oksman, Kristiina
本文主要研究了高填充纤维素纤维-聚丙烯复合材料的制备及其力学性能的评价。采用挤压法制备了含偶联剂和不含偶联剂的纤维重量达60%的纤维素纤维增强聚丙烯复合材料。为了使纤维一致地进入挤出机，使用了颗粒化技术，其中纤维被压成颗粒。研究中使用了两种商业等级的纤维素纤维，漂白亚硫酸盐纤维和漂白硫酸盐纤维。纤维尺寸测量结果表明，高纤维负荷下的成球过程和挤压是造成纤维断裂最严重的原因。弯曲试验表明，增加纤维载荷使复合材料变硬，但降低了其韧性。添加马来酸酐接枝偶联剂（MAPP）可显著提高复合材料的刚度和强度。总的来说，硫酸盐纤维和亚硫酸盐纤维复合材料的力学性能没有显著差异。一个有趣的发现是，MAPP改性纤维素纤维-聚丙烯复合材料的弯曲模量和强度并不高于之前报道的木粉-聚烯烃复合材料。扫描电镜结果表明，偶联剂的加入改善了纤维与聚丙烯基体之间的界面附着力。(c) 2007 Elsevier Ltd.版权所有。
This study focused on manufacturing of highly filled cellulose fibre-polypropylene composites and evaluation of the mechanical properties of the composites. Cellulose fibre reinforced polypropylene composites with up to 60 wt% of fibres with and without coupling agent were manufactured by extrusion. In order to achieve consistent feeding of the fibres into the extruder a pelletization technique was used where the fibres were pressed into pellets. Two commercial grades of cellulose fibres were used in the study, bleached sulfite and bleached kraft fibres. Fibre dimension measurements showed that the pelletization process and extrusion at high fibre loading caused the most severe fibre breakage. Flexural testing showed that increased fibre loading made the composites stiffer but reduced tile toughness. Addition of maleic anhydride grafted coupling agent (MAPP) increased the stiffness and strength of the composites significantly. In general, there was no significant difference in the mechanical properties between the composites with kraft and sulfite fibres. An interesting finding was that the flexural modulus and strength of the MAPP modified cellulose fibre-polypropylene composites were not higher than what has previously been reported for wood flour-polyolefin composites. Scanning electron microscopy showed that addition of coupling agent improved the interfacial adhesion between the fibres and polypropylene matrix. (c) 2007 Elsevier Ltd. All rights reserved.