The use of functional polymeric composites with superior thermal properties, capable of replacing conventional polymers, has increased in recent years, particularly in the electrical-electronics sector where thermal management is crucial. Carbon fiber (CF) polymer–matrix structural composites have relatively high in-plane thermal conductivity but low through-plane conductivity. In order to further enhance the through-plane and in-plane conductivity of CF-reinforced polybutylene terephthalate (PBT) composite, a hybrid loading approach was employed, incorporating synthetic graphite (SG), boron nitride (hBN), aluminium nitride (AlN) and graphene (G) in composite formulations. It was found that the in-plane conductivity of PBT-20CF-20SG-3G and the through-plane conductivity of PBT-20CF-20SG-3AlN are 69% and 25% higher, respectively, than those of PBT-40CF. However, the mechanical properties of hybrid composites exhibit lower values compared to those of CF-reinforced PBT composites. The tensile strength value of PBT-40CF is about 33% and 57% higher than those of PBT-20CF-20SG-3G and PBT-20CF-20SG-3AlN. Moreover, the flexural strength of PBT-40CF is about 48% and 38% higher than those of PBT-20CF-20SG-3G and PBT-20CF-20SG-3AlN, respectively. The density value of PBT-40CF is lower than that of the composites of PBT-20CF-20SG. From TGA it was observed that the thermal stability of PBT-40CF is comparable to that of the composites PBT-20CF-20SG. From the conducted study, it can be proposed that the hybrid combination of SG, hBN, AlN and G can be utilized to achieve higher thermal conductivity values, instead of relying solely on CF in the composites. © 2024 The Authors. Polymer International published by John Wiley & Sons Ltd on behalf of Society of Industrial Chemistry.

中文翻译：

---

混合导热填料对碳纤维增强聚对苯二甲酸丁二醇酯复合材料导热性能的影响

近年来，具有优异热性能、能够替代传统聚合物的功能性聚合物复合材料的使用有所增加，特别是在热管理至关重要的电子电气领域。碳纤维（CF）聚合物基结构复合材料具有相对较高的面内导热系数，但平面导热系数较低。为了进一步提高碳纤维增强聚对苯二甲酸丁二醇酯（PBT）复合材料的面内和面内电导率，采用了混合加载方法，加入了合成石墨（SG）、氮化硼（hBN）、氮化铝（AlN）和复合配方中的石墨烯（G）。结果发现，PBT-20CF-20SG-3G的面内电导率和PBT-20CF-20SG-3AlN的面内电导率分别比PBT-40CF高69%和25%。然而，与 CF 增强 PBT 复合材料相比，混合复合材料的机械性能表现出较低的值。PBT-40CF的拉伸强度值比PBT-20CF-20SG-3G和PBT-20CF-20SG-3AlN高约33%和57%。此外，PBT-40CF的弯曲强度分别比PBT-20CF-20SG-3G和PBT-20CF-20SG-3AlN高约48%和38%。PBT-40CF的密度值低于PBT-20CF-20SG复合材料的密度值。从 TGA 观察到，PBT-40CF 的热稳定性与复合材料 PBT-20CF-20SG 相当。根据所进行的研究，可以提出，可以利用 SG、hBN、AlN 和 G 的混合组合来实现更高的导热率值，而不是仅仅依靠复合材料中的 CF。© 2024 作者。《Polymer International》由 John Wiley & Sons Ltd 代表工业化学学会出版。