基于溶胶-凝胶技术制备纳米纤维素的表征

摘要

通过傅里叶变换红外光谱、X射线衍射、热重、透射电子显微镜分析及激光粒度分析对基于溶胶-凝胶技术制备的纳米纤维素进行表征,结果表明原料微晶纤维素超分子结构为纤维素Ⅰ型,制备的纳米纤维素为纤维素Ⅱ型;微晶纤维素的结晶度为87.54%,纳米纤维素的结晶度为73.49%,纳米纤维素结晶度较微晶纤维素有所下降;制备的纳米纤维素热稳定性低于微晶纤维素;纳米纤维素平均粒度425 nm,粒度分布呈现正态分布;纳米纤维素长径比为5∶1～40∶1。%Nano-cellulose prepared by sol-gel method was characterized by using Fourier transform infrared(FTIR) spectroscopy,X-ray diffraction(XRD),thermal gravimetric analysis(TGA),transmission electron microscopy(TEM) and laser particle size test.The results showed that supramolecular structure of microcrystalline cellulose(MCC) as raw material was cellulose I,while the prepared nano-cellulose was cellulose Ⅱ.The crystallinity of MCC was calculated as 87.54 %,for nano-cellulose,the crystallinity was 73.49 %.The crystallinity of nano-cellulose decreased slightly compared with that of MCC.The thermal stability of nano-cellulose was less than that of MCC.The mean size of nano-cellulose was 425 nm,its particle size distribution appeared normal distribution.Aspect ratio of nano-cellulose was 5∶1 to 40∶1.