SHEAR-RATE, CONCENTRATION, MOLECULAR-WEIGHT, AND TEMPERATURE VISCOSITY DEPENDENCES OF HYALURONATE, A WORMLIKE POLYELECTROLYTE
SHEAR-RATE, CONCENTRATION, MOLECULAR-WEIGHT, AND TEMPERATURE VISCOSITY DEPENDENCES OF HYALURONATE, A WORMLIKE POLYELECTROLYTE
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DOI：
10.1021/ma00077a036
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发表时间：
1993-12-06
期刊：
影响因子：
5.5
通讯作者：
RINAUDO, M
中科院分区：
文献类型：
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作者：
FOUISSAC, E;MILAS, M;RINAUDO, M
透明质酸盐溶液的剪切流动在来自细菌来源的充分表征的样品上进行了研究。的零剪切粘度，eta 0，与聚合物浓度，分子量和温度的依赖关系进行了讨论。这种半刚性离子聚合物的行为在某种程度上不同于溶液中的柔性聚合物。特别地，在固定聚合物浓度C下log η 0对log M的曲线的斜率等于4，而不是在更浓缩的区域中的3.4。尽管如此，已根据为柔性聚合物和聚电解质开发的模型分析了eta 0的浓度依赖性。这些模型似乎适用于蠕虫状聚合物的存在下，一个有限的semidilute区域。剪切稀化的发病被发现是很好的特点，从最长的弛豫时间（τ（r）-1）的倒数在考虑C，M，和T的依赖性的解决方案。与动物源透明质酸盐的差异归因于这些样品中的蛋白质含量。
The shear flow of hyaluronate solutions are studied on well characterized samples from bacterial sources. The dependence of the zero-shear viscosity, eta0, with polymer concentration, molecular weight, and temperature are discussed. The behavior of this semirigid ionic polymer differs, in some way, from that of flexible polymers in solution. In particular, the slope of the plot of log eta0 vs log M at fixed polymer concentration, C, is equal to 4 instead of 3.4 in the more concentrated domain. Nevertheless the concentration dependences of eta0 have been analyzed on the basis of models developed for flexible polymers.and polyelectrolytes. These models seem to apply to wormlike polymers with a presence of a limited semidilute region. The onset of shear thinning is found to be well characterized from the inverse of the longest relaxation time (tau(r)-1) in the solution taking into account C, M, and T dependences. The differences with hyaluronates of animal sources are attributed to the protein content in these samples.