The Fluorescence Properties of Binary and Ternary Complexes of CMC in Solid State

In comparison with synthetic polymers, cellulose complexes are attractive for practical applications, owing to their non-toxicity and biodegradability. R Pemnikis and his coworkers studied the gel-properties of the complexes of CMC (or OECMC)/Al³⁺ (or Fe³⁺ and its applications in agriculture as biologically active substance carriers⑴.The fluorescence behavior of binary complex of CMC/Eu(Ⅲ) in solid state has been reported^[2,3]. It emits 615 nm fluorescence at 394 nm excitation wavelength. Its Fluorescence Intensities (FI) were difference with different the concentration of Eu³⁺ and Degree of Substitute of CMC, but its Fluorescence Spectrum was not affected by these parameters.     

The Characterization of the 2,3-Dialdehyde Cellulose Synthesized under Ultrasound Irradiation

Partial oxidation of cellulose with sodium periodate (or periodic acid) is one of the most versatile transformations since it provides access to various novel products and intermediates with valuable properties. Moreover, the reaction is a regioselective oxidation of the glycopyranose ring of cellulose, while the glycosidic linkages remain intact. The water insoluble product, 2,3-dialdehyde cellulose without glycopyranose ring,has found considerable interest, for obtaining carriers for enzymes, heparin-like anticoagulation activity, Schiff's base of cellulose, and for the design of advanced materials^[1-3].     

加载和卸载过程中复合材料叠层圆柱曲板后屈曲路径的研究

本文用动态松弛法研究了在加载和卸载过程中复合材料叠层圆柱曲板的后屈曲路径,发现了加载路径与卸载路径不重合的现象,给出了在均匀单轴压力作用下的十字叠层圆柱曲板在两种边界条件下的数值结果,并讨论了层数、曲率半径、初始几何缺陷等因素对后屈曲路径的影响.