Effect of natural additives on the rheological properties of cellulose fiber disperse systems
Effect of natural additives on the rheological properties of cellulose fiber disperse systems
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DOI：
10.1016/j.colsurfa.2007.09.001
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发表时间：
2008-03
期刊：
影响因子：
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通讯作者：
Daisuke Tatsumi;H. Kourogi;Bo Chen;Takayoshi Matsumoto
中科院分区：
文献类型：
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作者：
Daisuke Tatsumi;H. Kourogi;Bo Chen;Takayoshi Matsumoto
在纤维素纤维分散体系中加入一定量的多糖以改善其流变性能。用平行板和锥板式流变仪测定了体系的粘弹性能。对于稀相体系，用高速摄像机观察了它们的絮凝行为以及流动特性。虽然日本传统造纸中用作分散剂的Tororoaoi胶浆对体系没有影响，但瓜尔胶和木聚糖对降低动态模量具有较好的效果。所有体系的动态模量均与纤维浓度呈幂律关系，但指数值随聚合物的加入量和种类而变化。这些添加剂对降低体系絮凝效果不明显，但对降低体系应力跃变效果较好。沉降体积测量值很好地代表了添加的多糖的效果。这些结果表明，瓜尔胶或木聚糖的加入降低了纤维接触点处的摩擦力，并且使纤维排列更有序，层压更规则。
Some polysaccharides were added to cellulose fiber disperse systems to improve their rheological properties. The viscoelastic properties of the systems were measured with a parallel-plates or a cone-plate type rheometer. For the thin systems, their flocculation behaviors were also observed with a high-speed camera as well as the flow properties. Although Tororoaoi mucilage, which is used as a dispersant in the Japanese traditional papermaking, had no effect on the systems, guar gum and xylan had preferable effects on reducing the dynamic moduli. For all the systems, a power law relation was found between the dynamic moduli and the fiber concentrations; however, the exponent value was varied with the addition amount and kind of the polymers. These additives had no significant effect on reducing flocculation of the systems but preferable effect on reducing the stress leaps of the systems. The sedimentation volume measurements well represent the effect of the added polysaccharides. These results indicate that the addition of guar gum or xylan reduces the friction at the fiber contact points; and moreover, it makes the fibers lie in the better order and laminate more regularly.