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首页> 外文期刊>Cellulose >Effect of homogenization (microfluidization) process parameters in mechanical production of micro- and nanofibrillated cellulose on its rheological and morphological properties
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Effect of homogenization (microfluidization) process parameters in mechanical production of micro- and nanofibrillated cellulose on its rheological and morphological properties

机译：机械化生产微纤化和纳米原纤化纤维素的均质化（微流化）工艺参数对其流变学和形态学特性的影响

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摘要

The rheological properties of microfibrillated cellulose (MFC)anofibrillated cellulose (NFC) suspensions have an important role during processing and mixing. In this work, the process parameters for MFC/NFC production within a microfluidizer (i.e., the size of interaction chamber and number of passes) were varied to investigate the influences on morphology, zeta potential, chemical properties and rheological features including viscosity, creep, strain recovery and yield stress behavior. The stability and appropriate viscosity of the fiber suspensions can be controlled by optimizing the processing conditions, resulting in a reduction in fiber diameter and most negative zeta potential value. The viscosity increased with higher amount of fibrillation by using a smaller chamber or higher number of passes, but intermediate plateau values are characteristic for temporary aggregation and breaking-up of the fiber network. The creep response and yield stress have been described by parameters of the Burger model and Herschel-Bulkley model, respectively, showing a more prominent effect on yield stress of chamber size than number of passes. The network formation leads to lower creep compliance and step-like strain recovery. The transition from gel-like to liquid-like behavior as characterized by the dynamic yield point at a specific strain, is almost independent of the processing conditions. Most important, the total number of passes applied in production can be directly related to the rotational P,clet number, which combines rheological and morphological data.
机译：微纤维化纤维素（MFC）/纳米纤维化纤维素（NFC）悬浮液的流变特性在加工和混合过程中具有重要作用。在这项工作中，改变了微流化器中MFC / NFC生产的工艺参数（即，相互作用室的大小和通过的次数），以研究对形态，ζ电位，化学性质和流变特性（包括粘度，蠕变，应变恢复和屈服应力行为。可以通过优化加工条件来控制纤维悬浮液的稳定性和合适的粘度，从而减小纤维直径和最负的ζ电势值。通过使用较小的腔室或更多的通过次数，粘度会随原纤化程度的增加而增加，但是中间稳定值是纤维网络暂时聚集和破裂的特征。蠕变响应和屈服应力已分别通过Burger模型和Herschel-Bulkley模型的参数描述，显示出对腔室尺寸的屈服应力比通过次数更为显着的影响。网络的形成导致较低的蠕变柔度和阶梯状应变恢复。以特定应变下的动态屈服点为特征的从凝胶状到液体状的转变几乎与加工条件无关。最重要的是，在生产中应用的道次总数可以直接与旋转P，clet数相关，后者结合了流变学和形态学数据。

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