Evaluation of single-point equations to determine intrinsic viscosity of sodium alginate and chitosan with high deacetylation degree |
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| Affiliation: | 1. Department of Material and Commodity Sciences and Textile Metrology, Lodz University of Technology, 90-924 Lodz, Poland;2. Institute of Applied Computer Science, Lodz University of Technology, 90-924 Lodz, Poland;3. University of Social Sciences, 90-113 Lodz, Poland;1. Laboratory of Advanced Polymers & Optimized Materials (LAPOM), Department of Materials Science and Engineering, University of North Texas, 3940 North Elm Street, Denton, TX 76207, USA;2. Encore Wire Corp., 1324 Millwood Road, McKinney, TX 75069, USA;1. Chemistry Department, Faculty of Science, Damietta University, Damietta, Egypt;2. Physics Department, Faculty of Science, Damietta University, Damietta, Egypt;1. College of Materials Science and Metallurgy Engineering, Guizhou University, Guiyang 550025, Guizhou, People''s Republic of China;2. National Engineering Research Center for Compounding and Modification of Polymeric Materials, Guiyang 550014, Guizhou, People''s Republic of China;3. College of Materials and Metallurgy Engineering, Guizhou Institute of Technology, Guiyang 550003, Guizhou, People''s Republic of China;1. The Key Laboratory of Polymer Processing Engineering, Ministry of Education, China (South China University of Technology), Guangzhou, 510640, China;2. College of Chemistry and Chemical Engineering, Henan University, Kaifeng 475004, China;3. School of Chemistry and Chemical Engineering, Guangxi University, Nanning, 530004, China |
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| Abstract: | A viscometric study of two polyelectrolytes, chitosan (CH, with 94% deacetylation degree, in a solute-mixture of acetic acid (0.1 mol L−1) and sodium chloride (0.2 mol L−1) and sodium alginate (SA, with 62% M-units, in sodium chloride (0.1 mol L−1), was performed at 25 °C. Five different equations were applied to calculate intrinsic viscosity [η]: Huggins, Kraemer and Schulz-Blaschke (SB) by graphical extrapolation; Solomon-Ciuta, Deb-Chanterjee and again SB, by faster single-point determination. Viscometric constants were calculated employing graphical extrapolation equations. Average molar mass (‾Mv) values were determined by applying the Mark-Houwink-Sakurada equation. For the samples analyzed, Huggins equation was the most suitable to calculate [η] and‾Mv by graphical extrapolation for chitosan, while Schulz-Blaschke and Solomon-Ciuta were adequate for single-point determinations of sodium alginate. Viscometric constants indicated that the aqueous mixture of acetic acid and sodium chloride is a poor solvent for chitosan, while sodium alginate is well solvated by aqueous sodium chloride. |
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| Keywords: | Intrinsic viscosity Sodium alginate Chitosan Single-point equations Average molar mass |
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