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

被引：83
|
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.
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页码：245 / 250
页数：6
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