Viscometry is an inexpensive characterization method to obtain important information about the hydrodynamic volume and conformation of polymers in diluted solutions, in a determined solvent and specific temperature. The viscometric parameters can be mathematically calculated by graphical extrapolation or single-point determination. This article reports a viscometric study of two polysaccharides, carboxymethylcellulose (CMC) (degree of substitution = 2.23) and gellan (GL), with the use of two calculation methods, employing a series of six equations: Huggins, Kraemer and Schulz-Blaschke, by graphical extrapolation; and Schulz-Blaschke, Solomon-Ciuta and Deb-Chanterjee, by single-point determination. It is also used Wolf equations for a different way to determine the intrinsic viscosity. The solution for CMC analyses was NaCl 0.2 mol/L, and for gellan determination, the solvent applied was KCl 0.1 mol/L. For both polymers, the test temperature was 30 ± 0.1 °C. The average molar mass was also determinate by the viscometry analysis. The values of intrinsic viscosity of some constants indicated that the solvents systens used for CMC and for gellan, the solvents used are classified as a good system (k_h + k_k < 0.5). It was also observed that the method of calculation by a single-point determination was valid for both polyelectrolytes analyzed.

粘度测定法是一种廉价的表征方法，可在确定的溶剂和特定温度下获得有关稀释溶液中聚合物的流体力学体积和构象的重要信息。粘度参数可以通过图形外推或单点确定来数学计算。本文使用两种计算方法，对两个多糖（羧甲基纤维素（CMC）（取代度= 2.23）和结冷胶（GL））进行了粘度测定研究，采用了六个方程式：Huggins，Kraemer和Schulz-Blaschke，通过图形外推；和舒尔茨-布拉施克（Schulz-Blaschke），所罗门-休塔（Solomon-Ciuta）和德布-尚特吉（Deb-Chanterjee），通过单点确定。还可以使用Wolf方程以其他方式确定特性粘度。用于CMC分析的溶液为NaCl 0.2 mol / L，为了确定结冷胶，所用溶剂为KCl 0.1 mol / L。对于两种聚合物，测试温度均为30±0.1°C。还通过粘度分析法确定平均摩尔质量。一些常数的特性粘度值表明，用于CMC和结冷胶的溶剂体系，所使用的溶剂被归类为良好体系（k_h  + k _k  <0.5）。还观察到，通过单点测定的计算方法对于所分析的两种聚电解质都是有效的。