Nano-Sb2O3对PBT基复合材料力学性能的影响

聚对苯二甲酸丁二醇酯(PBT)材料由于具有耐高温性能在工程领域中应用较为广泛,但需要添加阻燃剂以改善其易燃的缺陷,然而阻燃剂的添加会使其力学性能受到影响。采用机械化学法制备了纳米Sb2O3(nano-Sb2O3)颗粒,并采用KH550改性剂对其进行改性处理,再通过熔融共混法制备了实验用nano-Sb2O3/BPS/PBT复合材料。通过拉伸和冲击两种测试手段对复合材料的力学性能进行研究,并利用SEM分析其断口形貌。研究结果表明:随着nano-Sb2O3含量的增加,复合材料的拉伸强度和冲击强度均呈现出先升高后降低的趋势;当nano-Sb2O3的质量分数为1.5%时,复合材料的力学性能最优;当nano-Sb2O3的质量分数超过1.5%时,复合材料中产生了软团聚现象,其力学性能明显下降;通过SEM观察到nano-Sb2O3/BPS/PBT复合材料的冲击断面处有大量银纹生成,屈服现象明显。

Influence of Nano-Sb 2 O 3 Particles on Mechanical Properties of PBT-Based Composites

Polybutylene terephthalate(PBT)materials are widely used in the engineering field due to its high temperature resistance,but it is necessary to add flame retardants to reduce the flammability of PBT materials.However,flame retardants have a negative effect on the mechanical properties of PBT materials.In this study,nano-Sb 2O 3 particles were prepared by mechanochemical method,then modified by KH550.Nano-Sb 2O 3/BPS/PBT composites were prepared by melt blending method.The mechanical properties of nano-Sb 2O 3/BPS/PBT composites were studied by tensile test and impact test.The fracture morphologies of nano-Sb 2O 3/BPS/PBT composites were characterized by SEM.The results show that with the increase of nano-Sb 2O 3 content,the tensile strength and impact strength of composites increase firstly and then decrease.When the nano-Sb 2O 3 content is 1.5wt%,both tensile strength and impact strength of composites achieve the best values.When the nano-Sb 2O 3 content is more than 1.5wt%,the mechanical properties of composites decrease significantly due to the soft agglomeration of nano-Sb 2O 3 particles.Moreover,SEM image shows a lot of crazes form on the fracture surface of nano-Sb 2O 3/BPS/PBT composites,and there still exists obvious yield phenomenon.