Abstract Microfibrillar composites (MFC) with in-situ generated short polymeric fibres feature, unlike composites containing inorganic rigid fibres/particles, lower creep resistance in comparison with analogous blends containing spheres. Further attribute is unprecedented decrease in creep resistance of the blend by graphite nanoplatelets (GNP). Explanation of this behaviour of the HDPE/PA66/GNP system consists in characterization of structure and finite element analysis (FEA) „mapping“ the effect of reinforcement and interface parameters on creep behaviour. Lowering of reinforcement modulus and its viscoelasticity may lead to worse creep resistance of fibrous composites. FEA also indicates marked negative effect of the soft interface, i.e. GNP-reduced crystallinity of HDPE near the interface, on creep resistance of the spheres-reinforced system in contrast to MFC. Structural changes are indicated by polarized light microscopy, SEM and TEM. The results reveal so far unknown complexity of the performance of polymer/polymer composites which may cause unprecedented antagonistic effects.

中文翻译：

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HDPE/PA66 系统的抗蠕变性：PA66 相几何形状和石墨纳米片添加的影响

摘要 具有原位生成短聚合物纤维的微原纤维复合材料 (MFC) 与含有无机刚性纤维/颗粒的复合材料不同，与含有球体的类似混合物相比，具有较低的抗蠕变性。进一步的属性是石墨纳米片（GNP）导致共混物的抗蠕变性前所未有地降低。HDPE/PA66/GNP 系统的这种行为的解释包括结构表征和有限元分析 (FEA)“映射”钢筋和界面参数对蠕变行为的影响。增强模量及其粘弹性的降低可能导致纤维复合材料的抗蠕变性变差。FEA 还表明软界面的显着负面影响，即 GNP 降低界面附近 HDPE 的结晶度，与 MFC 相比，球体增强系统的抗蠕变性。结构变化由偏光显微镜、SEM 和 TEM 指示。结果揭示了迄今为止未知的聚合物/聚合物复合材料性能的复杂性，这可能会导致前所未有的拮抗作用。