PA6 absorbs moisture, restricting its use in humid applications. The first objective of this study is to process composite parts to be used in high humid applications using PA6 blend based matrix (PA6/PP/PP‐g‐MA) and SCF (3‐15 wt%) reinforcement. The second objective is to perform tensile and impact tests in both dry and wet conditions. The third objective is to carry out the in‐depth analysis of fractography of blends and composites. For blend, more than 50% reduction in water absorption was observed in comparison to pure PA6, indicating the need to blend with PP. The tensile strength of the composite with 15 wt% SCF was 55% and 133% higher than matrix blend in dry and wet conditions respectively indicating the need to reinforce the blend with SCF. Injection molded composites with 15 wt% SCF revealed the tensile strength of 54 MPa, 46 MPa and modulus of 5 GPa, 4 GPa in dry, wet state respectively. At higher SCF content, both SCF and PP are well dispersed in PA6 matrix but fiber pull out led to fracture of dry samples. Post water absorption, tensile fractured samples showed significant fiber pull out, indicating reduction in interfacial adhesion due to water absorption.

中文翻译：

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短碳纤维含量和吸水率对PA6 / PP共混物复合材料拉伸和冲击性能的影响

PA6吸收水分，限制了其在潮湿应用中的使用。这项研究的第一个目标是使用基于PA6共混物的基体（PA6 / PP / PP-g-MA）和SCF（3-15 wt％）增强材料来加工用于高湿度应用的复合零件。第二个目标是在干燥和潮湿条件下进行拉伸和冲击测试。第三个目标是对共混物和复合物的形貌进行深入分析。对于共混物，与纯PA6相比，吸水率降低了50％以上，这表明需要与PP共混。在干燥和潮湿条件下，具有15 wt％SCF的复合材料的拉伸强度分别比基质共混物高55％和133％，这表明需要用SCF增强共混物。具有15 wt％SCF的注塑复合材料的拉伸强度为54 MPa，干态和湿态分别为46 MPa和5 GPa，4 GPa的模量。在较高的SCF含量下，SCF和PP都很好地分散在PA6基质中，但是纤维拉出导致干燥样品破裂。吸水后，拉伸断裂的样品显示出明显的纤维拉出，表明由于吸水导致界面粘合力降低。