中文摘要：

用表面烷基化的方法降低纳米纤维素表面的亲水性，并通过傅里叶红外光谱、x射线衍射、x射线光电子能谱、扫描电子显微镜及能谱分析对烷基化后的纳米纤维素进行了测定。结果表明：KH-570和纳米纤维素之间发生了偶联反应，随着偶联剂浓度的升高，纳米纤维素的结晶度先下降后上升；硅醇或部分缩合的硅醇包覆在纳米纤维素的表面，从而使烷基化纤维素的碳氧比下降；烷基化能使纳米纤维素表面的羟基量减少，降低了纳米纤维素表面的亲水性；硅烷偶联剂与纳米纤维素发生了偶联反应，且反应程度一致，纳米纤维素表面烷基化均一。

英文摘要：

Surface alkylation was used to improve the hydrophilcity of cellulose nanofibrils. Fourier transform infrared spectrum fourier, X-ray diffraction analysis, X-ray photoelectron spectroscopy, scanning electron microscope analysis and energy diffraction spectrum were applied to test the alkylated cellulose nanofibrils. The results showed that coupling reaction occurred between KH-570 and cellulose nanofibrils; the crystallinity of cellulose nanofibrils feil first and then increased a little with the coupling agent concentration increased. The surface of cellulose nanofibrils was covered by silicon alcohol or partial condensation silicon alcohol. And the carbon-oxygen ratio of alkylated cellulose nanofibrils decreased. There were less hydroxyl groups in alkylated cellulose nanofibrils than in cellulose nanofibrils. SEM shows that MEMO reacts with cellulose nanofibrls homogeneously.