Influence of PA11 and PP thermoplastic polymers on recycling stability of unidirectional flax fibre reinforced biocomposites
Influence of PA11 and PP thermoplastic polymers on recycling stability of unidirectional flax fibre reinforced biocomposites
复制标题
DOI：
10.1016/j.polymdegradstab.2016.12.003
复制
发表时间：
2017-02-01
影响因子：
5.9
通讯作者：
Baley, Christophe
中科院分区：
文献类型：
--
作者：
Gourier, Clement;Bourmaud, Alain;Baley, Christophe
在这项研究中，我们探索了回收PAU和PP单向亚麻纤维复合材料的兴趣。在描述了复合材料各组分的力学性能后，对回收前后的拉伸性能进行了研究。结果表明，在多个回收步骤中，复合材料的弹性系数和强度具有良好的稳定性，这也适用于纤维性能，整个回收过程中的纳米压痕测试突出了这一点。然而，有趣的是，PAH复合材料的断裂伸长率随着注射循环次数的增加而显著增加，从5.2%到14.7%不等。进一步的分析表明，PA11基质具有高度稳定的热、流变和力学性能，因此该基质不参与断裂伸长率的增加。亚麻纤维的长度随着循环次数的增加而逐渐减少，尤其是在PA11基质中的情况下，与PP基质中的情况相比更是如此。这种急剧下降的原因是基质的高粘度，但最重要的是亚麻纤维中存在缺陷(扭结带)，间隔60微米，这与回收结束时测得的剩余长度一致。PAU和PP亚麻UD复合材料回收后效率很高，而PA11生物复合材料回收后伸长率提高，成为生物复合材料行业的首选材料。(C)2016爱思唯尔有限公司。保留所有权利。
In this study, we explore the interest of recycling PAU and PP unidirectional flax fibre composites. After describing the mechanical performance of the various components of the composite, its tensile properties are investigated before and after recycling. The results indicate a good stability of the modulus and strength of the composites during the multiple recycling steps, which also applies to the fibre properties, as highlighted by nanoindentation tests throughout the recycling process. However, interestingly, the elongation at break of the PAH composites shows a significant increase with the number of injection cycles, ranging from 5.2 to 14.7%. Further analyses show that the PA11 matrix has highly stable thermal, rheological and mechanical properties, so the matrix cannot be involved in this increased elongation at break. Flax fibers display a steady decrease in length with recycling, especially in the case of PA11 matrix compared to PP matrix. This drastic decline is explained by the high viscosity of the matrix, but above all by the presence of defects (kink bands) in the flax fibers, spaced at intervals of 60 mu m, which is consistent with the residual lengths measured at the end of recycling. PAU and PP flax UD composites prove to be very efficient after recycling, while PA11 biocomposites exhibit an increase of elongation after recycling that makes it a material of first choice in the biocomposites industry. (C) 2016 Elsevier Ltd. All rights reserved.