Preparation Of Cellulose Fatty Acid Ester And Its Biodegradable Behavior

Cellulose fatty acid ester, such as Cellulose laurate and cellulose palmate ,was synthesized in the homogeneous cellulose solution used Microcrystalline cellulose as raw material.Their biodegradable behavior was alse studied.Firstly, cellulose was activated by ultrasonic,and dissolved in lithium chloride/ N,N-dimethylacetamide (LiCl/DMAc). The optimum conditions was obtained.13CNMR improved that the cellulose didn't derivative. Rheological properties of the solution was studied. The solution of different concentration has different characteristic.The results of Dynamic Frequency Scan showed that the cellulose solutions of different concentrations have the behavior of viscoelastic among selected frequency range.Secondly, cellulose laurate and cellulose palmitate were synthesized with fatty acids and co-reagent. The DS was calculated accurately by 1HNMR.The properties of the product were investagated by IR,XRD,TGA,DMA and tensile properties.The IR results showed that the product was cellulose ester.The XRD results showed that crystal structure of cellulose was destroyed. Thermal analysis results showed that the stability get enhanced.The Glass transition range of cellulose fatty acid este??came board,so as the plasticity and processing performance. Tensile testing showed that the elongation at break of of fatty acid ester get stronge.Thirdly, three methods were used to test the biodegradability of the product. The biodegradation rate of the product can reach to 40% after buried 28days.The biodegradability of tested materials is regenerated cellulose>PCL>Blend flim of Cellulose laurate and PCL>Cellulose laurate. After treated by lipase and cellulase, the product can alse be degraded.,but maintain a certain degree of mechanical strength.