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首页> 外文期刊>Journal of Polymers and the Environment >Rheological Studies of Microfibrillar Cellulose Water Dispersions
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Rheological Studies of Microfibrillar Cellulose Water Dispersions

机译：微纤维纤维素水分散体的流变学研究

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摘要

The rheological behaviour of microfibrillar cellulose (MFC) water dispersions has been investigated. For the first time a detailed study of shear dependent viscosity at low and high shear rate is presented. A peculiar time dependent behaviour measured in the area between 0 and 1000 s~l was identified. The study shows a hysteresis loop in the shear rate-viscosity relationship at low shear rate. Additional time dependent shear rate measurements were performed, and a hypothesis for a mechanism of interaction and formation of a fibrils network was suggested. Higher temperature caused lower viscosity values, and this difference was increased at higher shear rate values. Oscillatory measurements showed how the closeness of the fibrils helps network creations. Data obtained from high shear measurements showed that 1% MFC water dispersions had a dilatant behaviour at ultra high shear rates with values increasing from 120 to 300 Pa s in the area between 180,000 and 330,000 s~(-1) .
机译：已经研究了微原纤纤维素（MFC）水分散体的流变行为。首次提出了在低和高剪切速率下与剪切有关的粘度的详细研究。鉴定出在0至1000s-1之间的区域中测量的独特的时间依赖性行为。研究表明，在低剪切速率下，剪切速率与粘度之间存在一个磁滞回线。进行了其他随时间变化的剪切速率测量，并提出了相互作用和原纤维网络形成机理的假设。较高的温度导致较低的粘度值，并且在较高的剪切速率值下该差异增加。振荡测量表明，原纤维的紧密度如何帮助网络创建。从高剪切测量获得的数据表明，在180,000和330,000 s〜（-1）之间的区域中，1％的MFC水分散体在超高剪切速率下具有膨胀行为，其值从120 Pa s增加到300 Pa s。

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