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为了提高毛竹纳米纤维素的分散性及与非极性高分子材料的界面结合性,以硅烷偶联剂(KH-570)为改性剂,分别以乙醇和甲苯为溶剂对毛竹纳米纤维素进行烷基化改性处理,并利用傅里叶变换红外光谱(FTIR)、X射线衍射(XRD)、X射线能谱(EDAX)和X射线光电子能谱(XPS)对改性后的纳米纤维素性能进行检测分析。结果表明:纳米纤维素的羟基与硅烷偶联剂中的硅羟基之间发生了偶联反应,纳米纤维素的晶型未遭破坏,但是相对结晶度有所下降,烷基化改性后纳米纤维素表面的C和O原子数减少,即C原子与羟基中的O原子连接(C—OH)减少,且纳米纤维素表面羟基和硅烷偶联剂中的硅离子之间发生了配位作用。以乙醇为溶剂硅烷偶联剂改性后的纳米纤维素(E-CNF)的烷基化效果优于以甲苯为溶剂硅烷偶联剂改性后的纳米纤维素(TCNF)。
In order to improve the dispersibility of bamboo nanocellulose and the interfacial adhesion with non-polar macromolecule materials, the bamboo nanocellulose was treated with KH-570 as modifier and ethanol and toluene respectively Alkylation, and the modified nanocellulose was modified by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), X-ray energy dispersive spectroscopy (EDAX) and X-ray photoelectron spectroscopy (XPS) Performance testing and analysis. The results showed that there was a coupling reaction between the hydroxyl groups of the nanocellulose and the silanol groups in the silane coupling agent. The crystal form of the nanocellulose was not damaged, but the relative crystallinity decreased. After the alkylation modification, The number of C and O atoms on the surface of the cellulose decreases, that is, the C atom and the O atom in the hydroxyl group (C-OH) are reduced, and the coordination between the surface hydroxyl group in the nanocellulose and the silicon ion in the silane coupling agent . Alkylation of nanocellulose (E-CNF) modified with ethanol as a silane coupling agent was superior to that of the nanocellulose (TCNF) modified with toluene as a silane coupling agent.