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竹纤维(BF)经碱处理或偶联剂处理后,将其与聚丙烯(PP)共混得到PP/BF复合材料。对该复合材料进行水热老化研究,重点考察了BF粒径、含量及改性处理对水热老化试样力学性能的影响,并且通过红外光谱仪(FTIR)、扫描电子显微镜(SEM)、热重分析仪(TGA)等对水热老化后复合材料的化学结构、表面形态、热稳定性等进行了表征和测试。结果表明:随着老化时间的延长,PP/BF复合材料的力学性能出现不同程度的下降。当BF粒径为120目、含量为20%、碱处理浓度为7%时,对应的PP/BF老化试样均保持了较高的力学性能。另外,水热老化导致PP/BF复合材料的羰基数目有所增加,吸水率增大,且对复合材料断面形貌造成不同程度的破坏,但对其热稳定性影响不大。
After treated with alkali or coupling agent, the bamboo fiber (BF) is blended with polypropylene (PP) to obtain the PP / BF composite. The effects of BF particle size, content and modification on the mechanical properties of hydrothermally aged specimens were investigated. The effects of BF particle size, content and mechanical properties on the mechanical properties of hydrothermally aged specimens were investigated by means of infrared spectroscopy (FTIR), scanning electron microscopy (SEM) Analyzer (TGA) and other chemical composition, surface morphology, thermal stability and other composite materials after hydrothermal aging were characterized and tested. The results show that the mechanical properties of PP / BF composites decrease with the aging time. When BF particle size is 120 meshes, content is 20% and alkali treatment concentration is 7%, the corresponding PP / BF aged samples maintain high mechanical properties. In addition, the hydrothermal aging resulted in the increase of the carbonyl number of PP / BF composites, the increase of water absorption, and the destruction of the cross-sectional morphology of composites to varying degrees, but had little effect on the thermal stability.