College of Chemistry & Environmental Science, Hebei University, Baoding 071002, PR China.
Carbohydr Polym. 2013 Oct 15;98(1):161-7. doi: 10.1016/j.carbpol.2013.05.079. Epub 2013 Jun 5.
Microcrystalline cellulose (MCC)/nano-SiO2 composite fibers were processed from solutions in 1-allyl-3-methylimidazolium chloride (AMIMCl) by the method of dry-jet wet spinning. The oscillatory shear measurements demonstrated that the gel network formed above 10 wt% nano-SiO2 and the complex viscosity increased with increasing nano-SiO2. Remarkably, the shear viscosity of the nanofluids was even lower than solutions without nano-SiO2 under high shear rates. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) images revealed that well-dispersed particles exhibit strong interfacial interactions with cellulose matrix. Measurements on wide-angle X-ray diffraction (WAXD) indicated that the regenerated cellulose and nanocomposite fibers were the typical cellulose II crystalline form, which was different from the native cellulose with the polymorph of Type I. The tensile strength of the nanocomposite fibers was larger than that of pure cellulose fiber and showed a tendency to increase and then decrease with increasing nano-SiO2. Furthermore, the nanocomposite fibers exhibited improved thermal stability.
采用 1-烯丙基-3-甲基咪唑氯化物（AMIMCl）溶液中的干喷湿纺法制备了微晶纤维素（MCC）/纳米 SiO2 复合纤维。振荡剪切测量表明，在 10wt%纳米 SiO2 以上形成凝胶网络，复合粘度随纳米 SiO2 的增加而增加。值得注意的是，在高剪切速率下，纳米流体的剪切粘度甚至低于不含纳米 SiO2 的溶液。扫描电子显微镜（SEM）和透射电子显微镜（TEM）图像显示，分散良好的颗粒与纤维素基质表现出很强的界面相互作用。广角 X 射线衍射（WAXD）测量表明，再生纤维素和纳米复合材料纤维均为典型的纤维素 II 晶型，与具有 I 型多晶型的天然纤维素不同。纳米复合材料纤维的拉伸强度大于纯纤维素纤维，且随纳米 SiO2 的增加呈现先增加后减小的趋势。此外，纳米复合材料纤维表现出更好的热稳定性。
