Homogenous synthesis of sodium cellulose sulfates with regulable low and high degree of substitutions with SO3/Py in N,N-dimethylacetamide/LiCl

[Display omitted] •SCS samples with DS of 0.23–2.56 were prepared with SO3/Py in DMA/LiCl.•The method is very appropriate to prepare SCS with low and high DS values.•Celluloses with low and high DPw values exhibited similar reactivity for sulfation.•DS value is tunable by the amount of the sulfating...

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Bibliographic Details
Published in:European polymer journal 2019-10, Vol.119, p.181-188
Main Authors: Muhitdinov, Bahtiyor, Heinze, Thomas, Turaev, Abbaskhan, Koschella, Andreas, Normakhamatov, Nodirali
Format: Article
Language:English
Subjects:
Cellulose
Chemical reactions
Chemical synthesis
Cotton
Degree of polymerization
Degree of substitution
Depolymerization
Homogenous sulfation
Lithium chloride
Polymerization
Reagents
Sodium
Sodium cellulose sulfate
Substitution reactions
Sulfates
Sulfation
Sulfur trioxide
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Summary:[Display omitted] •SCS samples with DS of 0.23–2.56 were prepared with SO3/Py in DMA/LiCl.•The method is very appropriate to prepare SCS with low and high DS values.•Celluloses with low and high DPw values exhibited similar reactivity for sulfation.•DS value is tunable by the amount of the sulfating reagent or time and temperature.•The reaction produced SCS with low chain degradation and high yield. Synthesis possibility of cellulose sulfates with a low and high degree of substitution (DS) by direct homogenous sulfation of cotton cellulose in N,N-dimethylacetamide/lithium chloride (DMA/LiCl) using SO3/pyridine (Py) complex was studied comprehensively. The sulfation reactions were carried at different temperatures, time durations, amount of the sulfating reagent and celluloses with varying weight average degree of polymerization (DPw). It was found that the method is very appropriate to prepare sodium cellulose sulfate (SCS) with low and high DS from celluloses having wide range DPw. Completely water-soluble SCS samples with regulable DS values from 0.23 to 2.56 were obtained. Suitable conditions were proposed to gain high sulfate content and the samples with DS values of 2.16–2.32, and yield of 69.4–77.8% could be prepared in these conditions. Celluloses with low and high DPw values exhibited similar reactivity for sulfation. Precipitation of the product and drastic depolymerization in the polymer chain have not occurred during the reaction.
ISSN:0014-3057
1873-1945
DOI:10.1016/j.eurpolymj.2019.07.030