Herein the influence of the weight ratios of polybutylene terephthalate/polyamide (PBT/PA) and the quantity of Nano-MgO on the thermal conductivity and mechanical properties of PBT/PA blends were investigated experimentally. The results show that as the weight ratios of PBT/PA are 1: 1, the product has good thermal conductivity and mechanical properties by adding 40wt% MgO, and the thermal conductivity of 0. 787W/( m · K) , tensile strength of 35.7MPa, bending strength of 53.9 MPa and impact strength of 34. 6J · m-1 can be realized. Further study showed that the samples prepared through the two-step blending procedure possessed better mechanical properties with high impact strength and thermal conductivity than that via the one-step method.%主要研制了导热聚对苯二甲酸丁二醇酯/聚酰胺复合材料(PBT/PA),选用纳米氧化镁(MgO)为导热填料.首先探讨了基体树脂配比PBT/PA对PBT/PA/MgO复合材料导热和力学性能的影响；然后固定基体树脂配比,考察了纳米氧化镁的添加量对PBT/PA/MgO复合体系的导热性能和力学性能的影响.实验结果表明,当PBT/PA配比为1∶1,纳米氧化镁添加量为40wt％时PBT/PA/MgO复合材料在保持一定的力学性能的基础上热导率达到0.787W/(m·K),表明该复合体系具有优良的导热性能和力学性能.此外还研究了不同加工方法对复合材料力学性能和导热性能的影响,采用二步法制备的复合材料的导热性能和力学性能较一步法更为优异.利用二步加工法,同时通过调节PBT/PA配比控制共混物的双连续相形态,从而制备出导热性能较好的PBT/PA/MgO复合材料.
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