偶联剂对小麦秸秆/PP复合材料力学性能的影响

Effect of Coupling Agent on Mechanical Properties of Wheat Straw/PP Composite

通过接触角测量仪测试KBM-403偶联剂处理前后秸秆表面的亲水性,并利用扫描电镜观测秸秆表面形貌,用X光电子能谱对秸秆改性前后元素种类和含量进行表征。采用热压成型法制备了小麦秸秆/聚丙烯(PP)复合材料,研究浓度为1%、4%、7%、10%的KBM-403偶联剂处理小麦秸秆后,对于秸秆/PP复合材料力学性能的影响,研究结果表明:偶联剂处理后,秸秆表面疏水性增强,观测到表面形成薄膜。随着偶联剂浓度的增加,秸秆/PP的拉伸强度、弯曲强度、冲击强度呈先增大后减小的趋势。当偶联剂的浓度为1%时,拉伸强度和弯曲强度达到最大,分别为6.69 Mpa、12.74Mpa。当偶联剂浓度为4%时,其冲击强度达到最大为19.65KJ/m^(2)。

In this paper, the hydrophilicity of the straw surface before and after treatment with KBM-403 coupling agent was tested by contact angle measuring instrument, and the surface morphology of straw was observed by scanning electron microscope, and the element types and content of straw before and after modification were characterized by X-ray electron spectroscopy. The wheat straw/polypropylene(PP) composite material was prepared by the hot pressing method, and the KBM-403 coupling agent at the concentration of 1%, 4%, 7%, and 10% was used to treat the wheat straw. The research results show that the hydrophobicity of the straw surface is enhanced after treatment with the coupling agent, and a film is observed to form on the surface. With the increase of coupling agent concentration, the tensile strength,flexural strength and impact strength of straw/PP increased first and then decreased. When the concentration of the coupling agent is 1%, the tensile strength and flexural strength reach its maximum, which is 6.69 Mpa and 12.74 Mpa, respectively. When the concentration of the coupling agent is 4%, the maximum impact strength is 19.65 KJ/m^(2).