Viscometric study of chitosan solutions in acetic acid/sodium acetate and acetic acid/sodium chloride

被引：89
作者：
Costa, Cristiane N. [1 ]
Teixeira, Viviane G. [2 ]
Delpech, Marcia C. [1 ]
Souza, Josefa Virginia S. [1 ]
Costa, Marcos A. S. [1 ]
机构：
[1] Univ Estado Rio de Janeiro, Inst Quim, BR-20550900 Rio De Janeiro, RJ, Brazil
[2] Univ Fed Rio de Janeiro, Inst Quim, BR-21941909 Rio De Janeiro, RJ, Brazil
来源：
CARBOHYDRATE POLYMERS | 2015年 / 133卷
关键词：
Chitosan; Single-point determination; Solvent quality; Molecular weight determination; HIGH-CIS POLYBUTADIENE; MOLECULAR-WEIGHT; INTRINSIC-VISCOSITY; IONIC-STRENGTH; POLYMER; ACETYLATION; TOLUENE; CHITIN; NUMBER;
D O I：
10.1016/j.carbpol.2015.06.094
中图分类号：
O69 [应用化学];
学科分类号：
081704 ;
摘要：
A viscometric study was carried out at 25 degrees C to assess the physical-chemical behavior in solution and the mean viscometric molar mass ((M) over bar (nu)) of chitosan solutions with different deacetylation degrees, in two solvent mixtures: medium 1-acetic acid 0.3 mol/L and sodium acetate 0.2 mol/L: and medium 2-acetic acid 0.1 mol/L and sodium chloride 0.2 mol/L. Different equations were employed, by graphical extrapolation, to calculate the intrinsic viscosities [eta] and the viscometric constants, to reveal the solvent's quality: Huggins (H), Kraemer (K) and Schulz-Blaschke (SB). For single-point determination, the equations used were SB, Solomon-Ciuta (SC) and Deb-Chanterjee (DC), resulting in a faster form of analysis. The values of-(M) over bar (nu), were calculated by applying the equation of Mark-Houwink-Sakurada. The SB and SC equations were most suitable for single-point determination of [eta] and -(M) over bar (nu) and the Schulz-Blachke constant (k(SB)), equal to 0.28, already utilized for various systems, can also be employed to analyze chitosan solutions under the conditions studied. (C) 2015 Elsevier Ltd. All rights reserved.
引用
收藏
页码：245 / 250
页数：6
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