Mechanical activation and characterization of micronized cellulose particles from pulp fiber
Mechanical activation and characterization of micronized cellulose particles from pulp fiber
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DOI：
10.1016/j.indcrop.2019.111750
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发表时间：
2019-12-01
影响因子：
5.9
通讯作者：
Wolcott, Michael
中科院分区：
文献类型：
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作者：
Huang, Lang;Wu, Qiong;Wolcott, Michael
球磨已广泛用于纤维素纤维的粉碎和去结晶，但以往的球磨研究大多集中在纤维素的微观结构变化和结晶度降低方面，很少评估球磨条件和能量效率的系统影响。该研究的目的是调查和了解各种球磨参数对纸浆纤维研磨性能的影响。从行星式球磨中系统研究了球磨时间、转速、投料比、磨球直径以及纸浆纤维的初始含水量。在研磨过程中评估了粉碎粒度、颗粒形态、结晶度变化、键合破坏、热稳定性、比表面积和能量效率。结果显示，纤维素纤维主要在研磨早期（大约 20 分钟）被粉碎，不同的变量导致最终颗粒尺寸和形状的变化。精制后，由于纤维素链间和内部氢键的减弱或分解，纸浆纤维的结晶度和热稳定性下降。随着粒径的减小，比表面积增加了4~5倍，而球磨时间40 min后球磨能效下降。
Ball milling has been widely used for cellulosic fiber pulverization and de-crystallization, but most of the previous milling studies are focused on the micro-structural change and crystallinity reduction of cellulose, few of them have evaluated the systematic influence of milling conditions and the energy efficiency. The objective of the study is to investigate and understand the effect of various ball milling parameters on the pulp fiber grinding performance. Ball mill time, rotational speed, charge ratio, mill ball diameters, and initial moisture content of pulp fiber were studied systematically from planetary ball milling. The pulverized particle size, particle morphology, crystallinity change, bonding disruption, thermal stability, specific surface area, and energy efficiency were evaluated during the milling process. Results revealed that cellulose fiber was mainly pulverized during the early milling stage (similar to 20 min) and different variables led to changes regarding to the final particle size and shape. After refinement, the crystallinity and the thermal stability of the pulp fiber decreased, from the weakening or disintegration of the inter and intra hydrogen bonds of the cellulose chains. The specific surface area increased by 4 similar to 5 times with the particle size reduction, while the milling energy efficiency decreased after 40 min of milling time.