竹粉的表面改性及其对聚丙烯基复合材料性能的影响

用偶联剂KH-550和硬脂酸对氢氧化钠溶液(10wt%)处理过的竹粉(BF)表面进行二次改性,然后通过熔融挤出制备了竹粉/聚丙烯(BF/PP)木塑复合材料.采用热重-差热分析(TG/DTA)、红外光谱(FTIR)、X射线衍射(XRD)和原子力显微镜(AFM)等对改性前后竹粉的微观结构进行表征.结果表明,改性后BF的热稳定性升高,比表面积增大,形成疏松的纤维聚集束;复合材料的力学性能显著提高;其中用KH-550改性竹粉制备的复合材料力学性能最佳,冲击强度较纯PP提高了83%.复合材料冲击断面扫描电镜(SEM)显示,KH-550改性可以明显提高BF与PP基体树脂间的相容性.

Surface Modification of Bamboo Flour for Polypropylene Based Composites

The bamboo flour (BF)were treated with different modifiers, and bamboo flour/polypropylene(BF/PP)composites were prepared via melt extrusion process.The micro-structure and properties of BF were analyzed by TG/DTA, FTIR, XRD and AFM.The results show that surface treatment improves the heat resistance and specific surface area of BF, and some looser fiber bundles are formed as well.The SEM images of the fractured surface of BF/PP composites indicate that treatment of BF with KH-550 efficiently improves the interfacial adhesion between BF and PP resins that leads to the enhancement of impact strength of the composite increased by 83% compared with that of pure PP.