In this work, the surface of the bamboo fibers (BF) was treated with three kinds of silane coupling agents terminated with amino functional groups (KH550), epoxy functional groups (KH560), and methyl functional groups (KH570) to improve fiber–matrix adhesion. The effects of silane treatment on the mechanical properties and thermal behavior of BF/polypropylene (PP) composites were investigated. Mechanical test results showed that the order of modification effectiveness was KH570 > KH550 > KH560. KH570 treated fiber composite exhibited the best mechanical properties. The tensile strength and flexural strength of 5 wt% KH570 treatment reached to 36.1 and 54.7 MPa, which were 15.4% and 23.6% higher than those of UBF/PP composites. Simultaneously, the thermal stability increased from 467.0°C (UBF) to 470.6°C (KH-570 treated BF). An increase in crystallization temperature (1.7°C) and a decrease in crystallinity (5.8%) occurred upon the addition of 5% KH570 silanes treated bamboo fibers.

中文翻译：

---

硅烷处理对竹纤维增强聚丙烯复合材料力学性能和热性能的影响

在这项工作中，竹纤维（BF）的表面用三种以氨基官能团（KH550）、环氧官能团（KH560）和甲基官能团（KH570）封端的硅烷偶联剂处理，以改善纤维-基质附着力。研究了硅烷处理对 BF/聚丙烯 (PP) 复合材料的机械性能和热行为的影响。力学试验结果表明，改性效果顺序为KH570>KH550>KH560。KH570处理的纤维复合材料表现出最好的机械性能。5 wt% KH570 处理的拉伸强度和弯曲强度分别达到 36.1 和 54.7 MPa，分别比 UBF/PP 复合材料高 15.4% 和 23.6%。同时，热稳定性从 467.0°C (UBF) 增加到 470.6°C（KH-570 处理的高炉）。