Polybutylene terephthalate (PBT) is a semi-crystalline engineering thermoplastic polyester. PBT offers rapid molding cycles, high heat resistant, crystallinity, fatigue resistance, strength and rigidity, excellent electrical properties, creep resistance, reproducible mold shrinkage and chemical resistance. In this study, PBT was loaded with synthetic graphite and carbon fiber at different weight fractions (10–40 wt.%). PBT-based composites were fabricated by the melt mixing process by using a co-rotating twin screw extruder then thermal, mechanical and morphological properties of filled PBT composites was investigated. Weight fraction of carbon fiber (up to 30 wt.%) increases the tensile strength and flexural strength of PBT, but synthetic graphite loading decreases the tensile strength and flexural strength of PBT. The highest in-plane and through-plane thermal conductivity values were obtained as 9.24 for 40 wt.% synthetic graphite filled composite and 3.41 W/mK for 40 wt.% carbon fiber reinforced composite, respectively. Carbon fiber was found to be more effective in increasing the through-plane thermal conductivities than synthetic graphite.

聚对苯二甲酸丁二醇酯（PBT）是一种半结晶工程热塑性聚酯。PBT具有快速成型周期，高耐热性，结晶度，抗疲劳性，强度和刚度，出色的电气性能，抗蠕变性，可再现的模具收缩性和耐化学性。在这项研究中，PBT负载了不同重量分数（10–40 wt。％）的合成石墨和碳纤维。基于同向双螺杆挤出机，通过熔融混合工艺制备了基于PBT的复合材料，然后研究了填充PBT复合材料的热，机械和形态学性能。碳纤维的重量分数（最高30％（重量））增加了PBT的拉伸强度和弯曲强度，但是合成石墨的负载降低了PBT的拉伸强度和弯曲强度。对于40重量％的合成石墨填充复合物，获得最高的面内和平面内导热率值分别为9.24和对于40重量％的碳纤维增强复合物为3.41W / mK。发现碳纤维比合成石墨在增加贯穿平面的热导率方面更有效。