Mark–Houwink parameters are determined for sodium alginate with low (SA LV) and medium (SA MV) molecular mass via a rheological approach. Firstly, salt screening concentration and polyelectrolyte nature of the polymers are investigated. Despite both alginates behaving as neutral polymer in θ solvent, differences are observed between them with the strong associative nature of SA MV highlighted by an abnormal high viscosity concentration dependence compared with the predicted values. The polysaccharide-specific hydrodynamic volume (i.e., intrinsic viscosity) is determined via Fedors approach, which is proved to provide accurate results applicable to a wide concentration range. A viscosity–molecular mass–concentration relationship is finally derived to calculate Mark–Houwink parameters via a non-linear regression according to Kulicke equation; the obtained values are consistent with those reported in literature, confirming the semi-flexible nature of SA in the investigated environment and proving the effectiveness of the proposed approach for polyelectrolytes with added salt ions.

中文翻译：

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添加盐时海藻酸钠溶液的流变特性：Kulicke方程的应用

Mark-Houwink 参数是通过流变学方法确定低 (SA LV) 和中等 (SA MV) 分子量海藻酸钠的。首先，研究了聚合物的盐筛选浓度和聚电解质性质。尽管两种藻酸盐在 θ 溶剂中都表现为中性聚合物，但观察到它们之间存在差异，与预测值相比，SA MV 的强缔合性质突出显示了异常的高粘度浓度依赖性。多糖特定的流体力学体积（即特性粘度）是通过 Fedors 方法确定的，事实证明，该方法可提供适用于广泛浓度范围的准确结果。根据Kulicke方程，通过非线性回归，最终推导出粘度-分子量-浓度关系以计算Mark-Houwink参数；