【摘要】 为了改善棉秸秆纤维与沥青结合料的粘附性，分别使用碱、硅烷和乙酸酐对棉秸秆纤维进行表面改性处理，并以木质素纤维作为参照，采用吸油性、耐热性、红外光谱特征峰演变、热重变化和粘附功作为评价指标，探索不同改性方法对棉秸秆纤维技术性能和粘附性的影响。结果表明：相较于未改性棉秸秆纤维，改性后的吸油率均能提高10%以上，尤其是经硅烷处理后，吸油率提高了13.8%;改性后纤维的耐热性得到提升，改善效果的先后顺序为：硅烷改性>碱改性>乙酸酐改性，质量损失率至少降低了8%;经表面改性后，棉秸秆纤维表面分子羟基含量降低，分子极性减小；碱、硅烷和乙酸酐均能提升棉秸秆纤维的热解温度，改性后的纤维开始降解温度升高了约30℃;经改性后，棉秸秆纤维与水的接触角增大，与甘油的接触角减小，疏水性得到明显改善，硅烷处理对粘附功的提升效果最显著。更多还原

【Abstract】 In order to improve the adhesion between cotton straw fiber and asphalt binder, alkali, silane, and acetic anhydride were employed to modify the surface of cotton straw fibers.With lignin fiber as a reference, oil absorption, thermal resistance, infrared spectral peak evolution, thermogravimetric change, and adhesion work were considered as evaluation indicators to explore the effects of different modification methods on the technical properties and adhesion of cotton straw fibers.The results showed that the oil absorption rate of modified cotton straw fibers could be increased by more than 10%,compared with unmodified cotton straw fibers.Especially, after silane treatment, the oil absorption rate was increased by 13.8%;The thermal resistance of all modified fibers was improved, and the order of improvement effects was: silane modification>alkali modification>acetic anhydride modification, with a quality loss rate reduced by at least 8%.After surface modification, the hydroxyl content and molecular polarity of cotton straw fibers decreased.Alkali, silane, and acetic anhydride could increase the pyrolysis temperature of cotton straw fibers, and the initial degradation temperature of modified fibers increased by about 30℃.After modification, the contact angle between cotton straw fibers and water increased, while the contact angle with glycerol decreased, indicating a significant improvement in hydrophobicity.Silane treatment had the most significant effect on increasing adhesion work.更多还原