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首页> 外文期刊>Journal of Applied Polymer Science >Mechanical properties of polypropylene composites based on natural fibers subjected to multiple extrusion cycles
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Mechanical properties of polypropylene composites based on natural fibers subjected to multiple extrusion cycles

机译：经受多次挤出循环的天然纤维聚丙烯复合材料的机械性能

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The influence of multiple extrusion cycles on the behavior of natural fibers-reinforced polypropylene was studied. Composites were fabricated with 20 wt % of flax fibers. Final fibers dimensions (length and diameter) were measured by means of optical microscopy. Mechanical properties of matrix and composites were measured after each extrusion cycle. It was observed that the elastic modulus increased by fibers incorporation. The elastic modulus of the matrix was higher after the first process cycle than that of the virgin material, mainly because of chain scission. In the next cycles, the modulus kept constant. On the other hand the elastic modulus of the composite after a single extrusion step was lower than that predicted by the Halpin-Tsai model probably because of a poor mixing and to low adhesion at the fiber-matrix interface. In the following two steps, modulus increased because the better fiber dispersion was observed. For the final two extrusion cycles, the slow decrease in this property was correlated with the darkening and poor organoleptic properties observed as a result of thermal degradation. (C) 2006 Wiley Periodicals, Inc. J Appl Polym Sci 103: 228-237, 2007
机译：研究了多个挤出循环对天然纤维增强聚丙烯性能的影响。用20wt％的亚麻纤维制造复合材料。最终的纤维尺寸（长度和直径）通过光学显微镜测量。在每个挤出循环后测量基体和复合材料的机械性能。观察到，通过引入纤维，弹性模量增加。在第一个处理循环后，基体的弹性模量比原始材料高，这主要是由于断链。在接下来的循环中，模量保持恒定。另一方面，在单个挤出步骤之后，复合材料的弹性模量低于Halpin-Tsai模型所预测的弹性模量，这可能是由于混合不良以及在纤维-基体界面的粘合力低所致。在接下来的两个步骤中，模量增加，因为观察到更好的纤维分散性。在最后的两个挤出循环中，该性能的缓慢下降与由于热降解而观察到的变黑和较差的感官特性相关。 （C）2006 Wiley Periodicals，Inc. J Appl Polym Sci 103：228-237，2007

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