Luo Qi, Huang Xin, Gao Fei, Li Dong, Wu Min
College of Engineering, China Agricultural University, P. O. Box 50, No. 17 QinghuaEast Road, Haidian District, Beijing 100083, China.
Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, No. 12 Zhongguancun South Street, Beijing 100081, China.
Materials (Basel). 2019 May 1;12(9):1420. doi: 10.3390/ma12091420.
Microcrystalline cellulose (MCC) aerogels were synthesized, blendingwith high amylose corn starch of different contents based on a NaOH-urea solution, and following by vacuum freeze-drying technology. The microstructure of the aerogel was observed by scanning electron microscopy (SEM) as an interconnected, porous three-dimensional structure, while X-ray diffractogram (XRD) measurements showed that the crystalline form was converted from cellulose I to cellulose II during dissolution and regeneration. Thermogravimetric analysis (TGA) showed that the content of starch had little effect on the thermal stability of the aerogel, whereas the content of starch had great influences on absorption and viscoelastic properties. When the ratio of starch was 10% and 15%, the prepared aerogels presented a low density and abundant pores, which endowed the aerogels, not only with the highest absorption ratio of pump oil and linseed oil (10.63 and 11.44 g/g, respectively), but also with better dynamic viscoelastic properties.
基于氢氧化钠-尿素溶液，合成了微晶纤维素（MCC）气凝胶，并与不同含量的高直链玉米淀粉混合，随后采用真空冷冻干燥技术。通过扫描电子显微镜（SEM）观察气凝胶的微观结构，其呈现出相互连接的多孔三维结构，而X射线衍射图（XRD）测量表明，在溶解和再生过程中，晶型从纤维素I转变为纤维素II。热重分析（TGA）表明，淀粉含量对气凝胶的热稳定性影响较小，而淀粉含量对吸收和粘弹性性能有很大影响。当淀粉比例为10%和15%时，制备的气凝胶密度低且孔隙丰富，这不仅赋予气凝胶最高的泵油和亚麻籽油吸收率（分别为10.63和11.44 g/g），还赋予其更好的动态粘弹性性能。
