双螺杆挤出和高压匀质处理制备 CNFs：对比研究。
CNFs from twin screw extrusion and high pressure homogenization: A comparative study.
机构信息
University of Sfax, Faculty of Science, LMSE, BP 802, 3018 Sfax, Tunisia.
University of Sfax, Faculty of Science, LMSE, BP 802, 3018 Sfax, Tunisia; Univ. Grenoble Alpes, CNRS, Grenoble INP, LRP, 38000 Grenoble, France; CNRS, LRP, F-38000 Grenoble, France.
出版信息
Carbohydr Polym. 2018 Sep 1;195:321-328. doi: 10.1016/j.carbpol.2018.04.104. Epub 2018 Apr 28.
Cellulose nanofibrils (CNFs) from oxidized never dried Eucalyptus pulps have been produced by using twin screw extrusion (TSE) and high pressure homogenizer (HPH), and their properties were compared. CNFs from TSE are produced at 10% solid content and then diluted to 1% for purpose of comparison against HPH. The nanosized fraction (NF) was around 90% for CNFs from HPH compared to 70% when TSE was used. Difference in the fibrillation extent has led to a higher transparency degree for CNFs gel from HPH. However, the rheological properties of two CNFs gels are quite similar with a solid-like aspect. The elastic modulus is one order of magnitude higher than viscous modulus and nearly frequency-independent. Analysis of the nanosized fraction with AFM has revealed long nanosized fibrils 3-4 nm in width for both CNFs types. When mixed with waterborne polymer dispersion, transparent to translucide nanocomposite films were obtained. However, the reinforcing potential of CNFs from HPH has been shown to be stronger than that from TSE.
用双螺杆挤出（TSE）和高压均化器（HPH）制备了从未干燥的氧化桉木浆制备的纤维素纳米纤维（CNF），并对其性能进行了比较。TSE 生产的 CNF 固含量为 10%，然后稀释至 1%，以便与 HPH 进行比较。与 TSE 相比，HPH 生产的 CNF 的纳米级部分（NF）约为 90%，而 TSE 为 70%。纤维细化程度的差异导致 HPH 生产的 CNF 凝胶具有更高的透明度。然而，两种 CNF 凝胶的流变性能非常相似，具有固态特征。弹性模量比粘性模量高一个数量级，几乎与频率无关。用 AFM 对纳米级部分进行分析表明，两种 CNF 类型的纳米纤维宽度均为 3-4nm。当与水基聚合物分散体混合时，得到了透明至半透明的纳米复合材料薄膜。然而，HPH 生产的 CNF 的增强潜力强于 TSE 生产的 CNF。
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