蔗渣纳米纤维素的制备与表征
发布时间：2019-03-29 14:38
【摘要】：以甘蔗渣为原料,通过无废酸的一步法、两步法和三步法制备了蔗渣纳米纤维素(BNC),并与酸解法进行对比.采用傅里叶红外光谱(FTIR)、扫描电子显微镜(SEM)、X射线衍射(XRD)和热重分析(TGA)等手段表征了纳米纤维素的光谱性质、形貌结构、结晶性能及热稳定性能.结果表明,4种方法处理后纤维形貌尺寸均可达到纳米级别且在一定浓度的水溶液中均可形成类果冻状的胶体,其中酸解法和三步法所制备的纳米纤维素长径比较小,形貌多为短棒状,在水溶液中分散稳定性较好,可稳定悬浮超过30 d;一步法和两步法所制备的纳米纤维素长径比较大,为类纤维状结构,分散稳定性相对较差,但也可稳定悬浮至少5 d;一步法所制备的纳米纤维素晶型为纤维素Ⅰ型和纤维素Ⅱ型的混合物,两步法、三步法和酸解法处理后的纤维晶型没有改变,仍然保持纤维素Ⅰ型.与酸解法相比,无废酸法所制备的纳米纤维素热稳定性更优,无废酸法工艺简单,反应条件温和,而酸解法反应步骤繁复,会产生大量废酸增加后续处理成本.
[Abstract]:Using bagasse as raw material, bagasse nano-cellulose (BNC), was prepared by one-step, two-step and three-step methods without waste acid and compared with acid hydrolysis. Fourier transform infrared spectroscopy (FTIR),) scanning electron microscope (SEM),) X-ray diffraction (XRD) (XRD) and thermogravimetric analysis (TGA) were used to characterize the spectral properties morphology crystallization and thermal stability of nano-cellulose. The results showed that the morphology and size of the fibers were up to nano-scale and jelly-like colloids could be formed in a certain concentration of aqueous solution, in which the nano-cellulose prepared by acid hydrolysis and three-step method was smaller in length and diameter. The morphology is short rod shape, the dispersion stability in aqueous solution is good, and the suspension can be stable for more than 30 days. The nano-cellulose prepared by one-step method and two-step method is large in length and diameter, which is fibrous-like structure, and its dispersion stability is relatively poor, but it can also be suspended stably for at least 5 days. The crystal form of nano-cellulose prepared by one-step method is the mixture of cellulose type 鈪，
本文编号：2449639
[Abstract]:Using bagasse as raw material, bagasse nano-cellulose (BNC), was prepared by one-step, two-step and three-step methods without waste acid and compared with acid hydrolysis. Fourier transform infrared spectroscopy (FTIR),) scanning electron microscope (SEM),) X-ray diffraction (XRD) (XRD) and thermogravimetric analysis (TGA) were used to characterize the spectral properties morphology crystallization and thermal stability of nano-cellulose. The results showed that the morphology and size of the fibers were up to nano-scale and jelly-like colloids could be formed in a certain concentration of aqueous solution, in which the nano-cellulose prepared by acid hydrolysis and three-step method was smaller in length and diameter. The morphology is short rod shape, the dispersion stability in aqueous solution is good, and the suspension can be stable for more than 30 days. The nano-cellulose prepared by one-step method and two-step method is large in length and diameter, which is fibrous-like structure, and its dispersion stability is relatively poor, but it can also be suspended stably for at least 5 days. The crystal form of nano-cellulose prepared by one-step method is the mixture of cellulose type 鈪，
本文编号：2449639
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