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首页> 外文期刊>Composite interfaces >Polypropylene-natural fibre composites. Analysis of fibre structure modification during compounding and its influence on the final properties
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Polypropylene-natural fibre composites. Analysis of fibre structure modification during compounding and its influence on the final properties

机译：聚丙烯-天然纤维复合材料。混合过程中纤维结构改性及其对最终性能的影响分析

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摘要

The final properties of composite materials are highly dependent on the residual geometrical parameters (length, diameter, aspect ratio), orientation and distribution of the fibres in the matrix, which in turn are related to the processing conditions. This study analysed the fibre structure variation during the processing of a polypropylene matrix reinforced with cellulose flax pulp for different reinforcement concentrations. The fibre's geometrical parameters, length, diameter and aspect ratio have been measured and their statistical distributions have been assessed for each concentration. Furthermore, the effect of the microstructure variation on the final mechanical properties was analysed. In particular, changes in the interfacial area were evaluated based on the hypothesis that the fibres were cylindrical in shape and considering the average values of the diameters and the lengths calculated using a statistical distribution approach. The fibre interfacial area after the process decreases as the fibre concentration increases and this evaluation explains how the adhesion methods that are used for fibre surface modification fail because of the decrement in the modifier interfacial density. The Halpin-Tsai approach was used to model the experimental data obtained from tensile tests for different composites, so as to confirm the effect of fibre parameters, such as aspect ratio and interfacial area values, in the PP/cellulose blends final properties.
机译：复合材料的最终性能高度依赖于残余几何参数（长度，直径，纵横比），纤维在基体中的取向和分布，而这些又与加工条件有关。这项研究分析了在不同的增强浓度下，用纤维素亚麻纸浆增强的聚丙烯基质在加工过程中纤维结构的变化。已测量了纤维的几何参数，长度，直径和长宽比，并对每种浓度评估了它们的统计分布。此外，分析了微观结构变化对最终机械性能的影响。特别地，基于纤维是圆柱形形状的假设并考虑使用统计分布方法计算的直径和长度的平均值来评估界面面积的变化。处理后的纤维界面面积随纤维浓度的增加而减小，该评估说明了由于改性剂界面密度的降低，用于纤维表面改性的粘合方法如何失败。 Halpin-Tsai方法用于模拟从不同复合材料的拉伸试验获得的实验数据，从而确定纤维参数（如长径比和界面面积值）对PP /纤维素共混物最终性能的影响。

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