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首先优化合成手段合成了不同位点上具有不同取代基的萘酐衍生物(DNA和DPN),然后用绿色溶剂氢氧化锂(LiOH)/尿素/水溶解纤维素,并通过工艺简单的化学交联水凝胶制备方法,首次制备了纤维素/DNA复合水凝胶(DNACH)和纤维素/DPN复合水凝胶(DPNCH),并通过紫外分光光度计测定纤维素荧光紫外吸收光谱,利用荧光光谱仪测定其荧光发射光谱,研究了随着时间变化,荧光纤维素水凝胶的发射光谱的变化。结果表明,杂化荧光水凝胶与荧光小分子在紫外谱图上有较大的波长位移变化,证明了新的体系的生成。DNACH、DPNCH荧光杂化水凝胶的最大荧光发射对应的波长分别为540、570nm,所对应的掺杂浓度均为2×10~(-4) mol/L。在同一掺杂浓度下,DPNCH具有最大荧光发射强度,这与DPN小分子的推电子基团和大的共轭结构有关,因此DPN小分子在制备具有高荧光的纤维素杂化材料时是很好的备选材料。
First of all, we synthesized the naphthalene anhydride derivatives (DNA and DPN) with different substituents on different sites and then dissolved the cellulose with green solvent LiOH / urea / water and through simple chemical process For the first time, cellulose / DNA composite hydrogel (DNACH) and cellulose / DPN composite hydrogel (DPNCH) were prepared for the first time. The cellulose fluorescence UV absorption spectra were measured by ultraviolet spectrophotometer. Fluorescence The fluorescence emission spectrum was measured with a spectrometer, and the change of the emission spectrum of the fluorescent cellulose hydrogel with time was studied. The results show that the hybrid fluorescent hydrogel and fluorescent small molecule have a larger wavelength shift in UV spectrum, which proves the formation of new system. The maximum fluorescence emission wavelengths of DNACH and DPNCH fluorescent hybrid hydrogels were 540 and 570 nm, respectively, corresponding to a doping concentration of 2 × 10 -4 mol / L. At the same doping concentration, DPNCH has the maximum fluorescence emission intensity, which is related to the pushing electron group and the large conjugated structure of DPN small molecule. Therefore, the DPN small molecule is very suitable for preparing cellulose hybrid material with high fluorescence Good alternative material.