Synthesis, Characterization And Property Of Cellulose Grafting Amino Acid

Cellulose is a kind of regenerative material with great potential and promising application. In order to obtain dialdehyde cellulose (DAC), the cotton fiber is selectively oxidized with NaIO4 and adjacent hydroxy groups of C2, C3 in glucose units of cotton fiber.The aldehyde compostion in DAC was obtained by titration and three titration methods and mechanisms have been discussed to conclude the optimum method is alkali consumption method. Based on the schiff base reaction, using the DAC and Glycine (Gly) as the reactant and p-nitrobenzaldehyde (p-NBD) as grafting bridge, a novel cellulose based schiff base ramificationâ–¡dialdehyde cellulose grafting glycin (DAC-g-Gly) was designed and synthesized. The optimum synthesis conditions of DAC-g-Gly were studied in detail. The yield and degree of substitution of DAC-g-Gly achieved were 86.1% and 11.4% respectively. The structure of intermediate product (DAC) and end product (DAC-g-Gly) were carefully characterized by X-ray diffraction analysis (XRD), FT-infrared spectroscopy (FT-IR), Cross polarization magic angle spin NMR (CP/MAS NMR) and Scanning electronic microscope (SEM). It was confirmed that the compounds which were synthesized were the expected product.Thermo gravimetric analysis (TG) and Differential Scanning Calorimetry (DSC) measurement indicated that the cotton fiber oxidized with NaIO4 was degraded during the oxidation reaction. It was also confirmed the grafting reaction enhanced the thermal stability of DAC.Simultaneously, the Scanning Electronic Microscope (SEM) revealed that the surface topography of the samples changed notably after the Trichoderma spp contaminated. It was also denoted that the biodegradation performance was enhanced evidently by oxidation and grafting reaction. The result of active silt degradation was performed by bi-indicator titration, showing that the degradation rate of DAC-g-Gly reached about 9.91% in litmusless silt-form soil possessing natural activity after four weeks.