无盐黄原胶水溶液的第二牛顿分支
Second Newtonian branch of salt-free aqueous xanthan solutions
摘要：
我们研究黄原胶水溶液的剪切速率高达约105 s-1。在这些剪切速率下，无盐溶液显示出第二个牛顿分支。取决于黄原胶的浓度，我们发现两个不同的制度与标度法众所周知的零粘度的稀和半稀颗粒溶液：交叉浓度是相当高的比在第一个牛顿分支，这可以是相关的取向的聚电解质。在第二种状态下，法向应力差以约为1的指数增加，表明聚合物溶液的行为类似于非线性液晶或刚性纤维悬浮液。在第一个区域，指数较小，表明聚电解质表现得更灵活
英文摘要：
We study aqueous xanthan solutions at shear rates up to about 105 s-1. At these shear rates, the salt-free solutions show a second Newtonian branch. Depending on the xanthan concentration, we find two different regimes with scaling laws well-known for the zero viscosity of dilute and semidilute particle solutions: The crossover concentration is considerably higher than in the first Newtonian branch, which can be related to the orientation of the polyelectrolytes. In the second regime, the normal stress differences increase with an exponent of about 1, indicating that the polymer solution behaves like nematic liquid crystals or rigid fiber suspensions. In the first regime, the exponent is smaller suggesting that the polyelectrolytes behave more flexible
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