预处理对麦秸/聚丙烯复合材料摩擦磨损性能影响实验

为提高麦秸秆纤维与聚丙烯(PP)基体的界面结合力,采用复合处理法对麦秸秆纤维进行表面处理:先分别用NaOH溶液浸泡、乙酸溶液浸泡、水热处理、蒸汽爆破和微波等方法对麦秸秆纤维进行预处理,再复合偶联剂法处理麦秸秆纤维；用熔融共混、模压成型方法制备麦秸秆/PP复合材料.用体视显微镜观察了不同处理后的麦秸秆纤维微观结构,采用红外光谱技术(FTIR)研究了不同表面处理麦秸秆纤维的红外光谱,用M-2000A型磨损实验机测试了麦秸秆不同表面处理方法制备PP复合材料摩擦磨损性能,并通过扫描电子显微镜(SEM)观察分析复合材料磨损表面形貌.结果表明,NaOH、水热和蒸汽爆破处理对麦秸秆纤维表面化学成分有明显的影响；复合处理麦秸秆制备的复合材料摩擦磨损性能均优于单纯使用偶联剂处理麦秸秆制备的复合材料；复合材料的主要磨损机制为磨粒磨损和粘着磨损,水热处理和蒸汽爆破的复合材料耐磨性能较好.

Effect of Different Pretreatments on Tribological Properties of Wheat Straw/Polypropylene Composites

In order to improve the interfacial bonding strength of wheat straw fibers and polypropylene (PP), the wheat straw fibers were treated by combining treatment. The surfaces of fibers were pretreated by five methods, such as NaOH, soaked in acetic acid solution, hydrothermal treatment, steam explosion treatments and microwave treatment. Then, they were compounded with coupling agent treatment. The wheat straw/PP composites were prepared by melt blending and molding. The microstructure of wheat fibers after different surface treatments was observed by stereo microscope. The infrared spectroscopy of wheat straw fibers after different surface treatments was examined by Fourier transform infrared (FTIR) technology. The tribological properties of PP composites filled with different surface treated wheat straw fibers were investigated by using M-2000A abrasion testing machine. The results showed that NaOH, hydrothermal treatment and steam explosion treatments had significant impact on the chemical composition of wheat straw fiber. The tribological properties of PP composites filled with combined treated fibers excelled than that of the composites filled with coupling agent treated fibers. The main wear mechanisms of worn surfaces were abrasive wear and adhesive wear. It was found that the composites filled with hydrothermal treatment and steam explosion treatment had good tribological properties.