Natural Products Chemistry Division, CSIR-North East Institute of Science and Technology, Jorhat 785 006, Assam, India.
Natural Products Chemistry Division, CSIR-North East Institute of Science and Technology, Jorhat 785 006, Assam, India.
Carbohydr Polym. 2014 Nov 4;112:342-9. doi: 10.1016/j.carbpol.2014.06.006. Epub 2014 Jun 10.
Cellulose acetate was synthesized from rice husk by using a simple, efficient, cost-effective and solvent-free method. Cellulose was isolated from rice husk (RH) using standard pretreatment method with dilute alkaline and acid solutions and bleaching with 2% H2O2. Cellulose acetate (CA) was synthesized successfully with the yield of 66% in presence of acetic anhydride and iodine as a catalyst in eco-friendly solvent-free conditions. The reaction parameters were standardized at 80 °C for 300 min and the optimum results were taken for further study. The extent of acetylation was evaluated from % yield and the degree of substitution (DS), which was determined by (1)H NMR and titrimetrically. The synthesized products were characterized with the help modern analytical techniques like FT-IR, (1)H NMR, XRD, etc. and the thermal behavior was evaluated by TGA and DSC thermograms.
采用简单、高效、经济且无溶剂的方法，从稻壳中合成了醋酸纤维素。使用稀碱性和酸性溶液进行标准预处理以及用 2%H2O2 进行漂白，从稻壳（RH）中分离出纤维素。在无溶剂的环保条件下，以醋酸酐和碘为催化剂，成功合成了醋酸纤维素（CA），产率为 66%。在 80°C 下反应 300 分钟，确定了标准化的反应参数，并对最佳结果进行了进一步研究。通过（1）H NMR 和滴定法，从产率和取代度（DS）评估乙酰化程度。通过傅里叶变换红外光谱（FT-IR）、（1）H NMR、X 射线衍射（XRD）等现代分析技术对合成产物进行了表征，并通过热重分析（TGA）和差示扫描量热法（DSC）评估了热行为。
