硬脂酸表面修饰纳米Sb_(2)O_(3)增强PBT基复合材料

The Poly(Butylene Terephthalate)-based Composites Reinforced by Stearic Acid Modified-Sb_(2)O_(3)Nanoparticles

通过机械球磨法,利用硬脂酸对纳米Sb_(2)O_(3)进行表面改性,并采用熔融共混法制备了纳米Sb_(2)O_(3)与聚对苯二甲酸丁二醇酯(PBT)的复合材料,通过X射线衍射仪(XRD)、傅里叶红外光谱仪(FT-IR)、热重分析仪(TG)对硬脂酸表面修饰前后纳米Sb_(2)O_(3)颗粒的晶型结构、表面官能团、表面包覆量特性进行表征.并通过扫描电子显微镜(SEM)和力学性能测试等手段表征了复合材料的力学性能,对比分析了改性与未改性纳米Sb_(2)O_(3)与PBT基复合材料力学性能的影响机制.结果表明,硬脂酸以化学键的作用方式成功包覆在纳米Sb2O3颗粒表面,其改性的纳米Sb2O3颗粒的晶型结构没有发生变化;随着纳米Sb_(2)O_(3)质量分数的增加,复合材料的拉伸屈服强度呈现先增大后减小的趋势,当纳米Sb2O3质量分数为3%时,复合材料表现出优异的综合性能.

Nano-Sb_(2)O_(3)particles were modified by stearic acid by the mechanochemical method based on high energy ball milling.The poly(butylene terephthalate)-based composites were then prepared by melting blending technology.The crystalline structure,surface functional groups,surface coverage characteristics of Sb_(2)O_(3)nanoparticles before and after surface modification were characterized by X-ray diffraction(XRD),Fourier transform infrared spectrometer(FT-IR)and thermogravimetric analyzer(TG).The mechanical properties of the composite were investigated by tensile testing and field emission scanning electron microscopy(SEM).The influence mechanisms of the modified and unmodified Sb_(2)O_(3)nanoparticles on mechanical properties of the composites were systematically investigated.Results show that the stearic acid is successfully grafted on the surface of Sb_(2)O_(3)nanoparticles by chemical bonding and the presence of stearic acid do not change the crystal structure of Sb_(2)O_(3)nanoparticles.The tensile strength of the composites increases firstly and then decreases with increasing the mass fraction of Sb_(2)O_(3)nanoparticles.When the mass fraction of nano-Sb_(2)O_(3)is 3%,the composite exhibits excellent comprehensive properties.