Bamboo is now widely used in construction, papermaking, textile, furniture and other fields because of its renewable, fast-growing, high-strength, high-yield and easy processing. However, compared with wood, bamboo and bamboo products are more vulnerable to damage by fungi and pests. An effective and eco-friendly method is urgently needed to improve their physical and chemical properties, decay resistance and anti-mildew properties, and hydrophobic properties. Here, bamboo was heated with methyl silicone oil. The effect of different temperatures (140 °C–200 °C) and different times (2 h–6 h) on the properties of bamboo was studied systematically, including chemical composition, physical and mechanical properties, surface wettability, decay resistance and anti-mildew property. No starch granules were observed inside the parenchymal cell lumen of bamboo specimen heat treated at 200 °C for 6 h. And with the increase of heat treatment temperature and time, the content of cellulose and hemicellulose decreases gradually while relative content of lignin increases due to its better thermal stability. Accordingly, the surface wettability decreases due to the changes of the surface functional groups and micro-morphologies. Under the condition of oil heat treatment at 160 °C for 2 h, the compressive strength parallel to grain of bamboo samples reach the maximum of 109.52 MPa. With further increase of heating temperature, the corresponding compressive strength decreases. The resulted bending strength and MOE both display similar changing trend. However, the optimal parameter is at 180 °C for 2 h, with the highest bending strength and MOE values of 142.42 MPa and 12,373.00 MPa, respectively. Finally, the decay resistance and anti-mildew property are dramatically enhanced with increased heat treatment temperature and time. All the corresponding changing mechanisms are investigated in depth and in detail. Our results provide comprehensive process parameters and micro-mechanism for the performance of oil heat treatment of bamboo, which can be used to guide the actual production.

中文翻译：

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油热处理对竹子生物学，机械和物理性能的影响

竹子因其可再生，生长迅速，高强度，高产量和易于加工而被广泛应用于建筑，造纸，纺织，家具和其他领域。但是，与木材相比，竹和竹制品更容易受到真菌和害虫的破坏。迫切需要一种有效且环保的方法来改善其物理和化学性能，耐腐性和防霉性能以及疏水性能。在这里，竹子用甲基硅油加热。系统地研究了不同温度（140°C–200°C）和不同时间（2 h–6 h）对竹子性能的影响，包括化学成分，物理和机械性能，表面润湿性，耐腐性和抗湿性。霉变特性。在200°C热处理6 h的竹标本的实质细胞腔内未观察到淀粉颗粒。并且随着热处理温度和时间的增加，纤维素和半纤维素的含量逐渐降低，而木质素的相对含量由于其更好的热稳定性而增加。因此，由于表面官能团和微观形态的变化，表面润湿性降低。在160°C油热处理2 h的条件下，平行于竹子样品的抗压强度达到最大值109.52 MPa。随着加热温度的进一步升高，相应的抗压强度降低。所得的弯曲强度和MOE都显示出相似的变化趋势。但是，最佳参数是在180°C下2 h，最高的弯曲强度和MOE值分别为142.42 MPa和12,373.00 MPa。最后，随着热处理温度和时间的增加，耐腐性和抗霉性得到显着增强。对所有相应的变化机制进行了深入和详细的研究。我们的结果为竹油的热处理性能提供了综合的工艺参数和微观机制，可用于指导实际生产。