以巨菌草(pennisetum sinese roxb)为原料,采用酸水解法制备了纳米纤维素(CNC),并应用响应面分析法对影响纳米纤维素得率的3个主要因素即硫酸浓度、温度、时间进行了优化。实验结果表明,利用Design-Expert的 Box-behnken 中心组合设计建立的二次多项式模型较显著,当硫酸浓度为51%,温度为60℃,时间为120min 时,纳米纤维素的得率达到最大值80%。制备的 CNC 呈棒状,直径约为20~30nm,长度100~200nm；XRD图谱表明CNC的结晶度较巨菌草显著提高；红外光谱表征显示,CNC 仍保持纤维素的基本结构。
Cellulose nanocrystalline (CNC)was prepared from Pennisetum Sinese Roxb by hydrolysis with sul-furic acid.The effects of sulfuric acid concentration,reaction temperature and reaction time on the yield of CNC were optimized with response surface methodology.The mathematical model was established by using the De-sign-Expert software.The results showed that quadratic model was the best model to describe the relationship between the yield of CNC and the factors.With the sulfuric acid concentration of 5 1%,reaction temperature of 60℃ and the reaction time of 120min,the yield of CNC reached the highest value of 80% in the investigation. The prepared CNC was rod-like with the diameter of 20-30nm and the length of 100-200nm.The XRD spectra showed that the crystallinity of CNC was higher than pennisetum sinese roxb fiber.The infrared spectra showed that CNC had similar structure with pennisetum sinese roxb fiber.
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