Investigation the correlation between chemical structure and swelling, thermal and flocculation properties of carboxymethylcellulose hydrogels

Hydrophilic polymer networks (hydrogels) based on sodium carboxymethylcellulose (NaCMC) and polycarboxylic acids (oxalic, succinic, citric and adipic) as cross‐linking agents are synthesized by esterification reaction; one series of NaCMC hydrogels cross‐linked with citric acid is prepared with acry...

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Bibliographic Details
Published in:Journal of applied polymer science 2021-03, Vol.138 (10), p.n/a
Main Authors: Erceg, Tamara, Stupar, Alena, Cvetinov, Miroslav, Vasić, Vesna, Ristić, Ivan
Format: Article
Language:English
Subjects:
Acrylamide
Acrylic acid
applications
biopolymers and renewable polymers
Charged particles
Chemical synthesis
Citric acid
Copolymers
Differential scanning calorimetry
Esterification
Flocculation
gels
Gravimetric analysis
Hydrogels
Interpenetrating networks
Materials science
Polycarboxylic acids
Polymers
Swelling
synthesis and processing techniques
Thermodynamic properties
Water purification
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Summary:Hydrophilic polymer networks (hydrogels) based on sodium carboxymethylcellulose (NaCMC) and polycarboxylic acids (oxalic, succinic, citric and adipic) as cross‐linking agents are synthesized by esterification reaction; one series of NaCMC hydrogels cross‐linked with citric acid is prepared with acrylamide and acrylic acid (Aam/Aac) copolymers using the design of semi‐interpenetrating polymer networks (semi‐IPN), in order to increase their potential application for flocculation purposes. The Infrared spectroscopy (FTIR) of hydrogels confirms the esterification reaction between NaCMC and cross‐linking agents. Results of swelling measurements show that citric acid in the amount of 15 wt% gives the hydrogels with the best absorption capacity. The results of Differential scanning calorimetry (DSC) and Thermal gravimetric analysis (TGA) show no significant difference in thermal properties of neat and semi‐interpenetrating NaCMC hydrogels. The amorphous nature of hydrogels is confirmed by X‐ray diffraction analysis (XRD). The results of flocculation study show that combination of NaCMC network and Aam/Aac copolymer with initial mass ratio of 10/90 creates a theoretical platform for the production of flocculant which could show high efficacy in purifying of water dominated by positively charged particles.
ISSN:0021-8995
1097-4628
DOI:10.1002/app.50240