Xue Yu, Qi Letian, Lin Zhaoyun, Yang Guihua, He Ming, Chen Jiachuan
School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, China.
State Key Laboratory of Biobased Material and Green Papermaking, Qilu University of Technology, Shandong Academy of Sciences, Jinan 250353, China.
Nanomaterials (Basel). 2021 Oct 11;11(10):2664. doi: 10.3390/nano11102664.
In this study, a novel type of high-strength regenerated cellulose composite fiber reinforced with cellulose nanofibrils (CNFs) and nanosilica (nano-SiO) was prepared. Adding 1% CNF and 1% nano-SiO to pulp/AMIMCl improved the tensile strength of the composite cellulose by 47.46%. The surface of the regenerated fiber exhibited a scaly structure with pores, which could be reduced by adding CNF and nano-SiO, resulting in the enhancement of physical strength of regenerated fibers. The cellulose/AMIMCl mixture with or without the addition of nanomaterials performed as shear thinning fluids, also known as "pseudoplastic" fluids. Increasing the temperature lowered the viscosity. The yield stress and viscosity sequences were as follows: RCF-CNF > RCF-CNF-SiO > RCF-SiO > RCF > RCF-CNF-SiO. Under the same oscillation frequency, G' and G" decreased with the increase of temperature, which indicated a reduction in viscoelasticity. A preferred cellulose/AMIMCl mixture was obtained with the addition of 1% CNF and 1% nano-SiO, by which the viscosity and shear stress of the adhesive were significantly reduced at 80 °C.
在本研究中，制备了一种新型的高强度再生纤维素复合纤维，其由纤维素纳米原纤（CNFs）和纳米二氧化硅（nano-SiO₂）增强。向纸浆/AMIMCl中添加1%的CNF和1%的nano-SiO₂可使复合纤维素的拉伸强度提高47.46%。再生纤维表面呈现出带有孔隙的鳞片结构，通过添加CNF和nano-SiO₂可减少孔隙，从而提高再生纤维的物理强度。添加或未添加纳米材料的纤维素/AMIMCl混合物表现为剪切变稀流体，也称为“假塑性”流体。温度升高会降低粘度。屈服应力和粘度顺序如下：RCF-CNF＞RCF-CNF-SiO₂＞RCF-SiO₂＞RCF＞RCF-CNF-SiO₂。在相同振荡频率下，G'和G''随温度升高而降低，这表明粘弹性降低。添加1%的CNF和1%的nano-SiO₂可得到优选的纤维素/AMIMCl混合物，通过该混合物，粘合剂在80℃时的粘度和剪切应力显著降低。
Zotero 插件