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A new approach to increasing the equilibrium swelling ratio of the composite superabsorbents based on carboxymethyl cellulose sodium salt

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Abstract

The work aims to research the effect of dibutyl succinate on the water-absorbing and water-holding properties of the composite superabsorbents enriched in the sodium salt of carboxymethyl cellulose. The synthesized composite superabsorbents with a different content of dibutyl succinate were analyzed by FTIR, SEM, XRD, DSC, and rheological measurements; equilibrium swelling ratio values, Qe, in distilled water and in a saline solution were determined; and swelling kinetics, water-holding properties, and regeneration ability were researched. It was found that adding 5% w of dibutyl succinate increases Qe values in distilled water up to 51% compared to blank superabsorbents. The effect of a plasticizer is due to its selective interaction with intramolecular H-bond-forming links, which increases the flexibility of the polymeric network and the availability of sorption sites for water molecules. The non-outwashing of a plasticizer in an aqueous medium was confirmed by HPLC–MS. The presence of dibutyl succinate does not change the water absorption mechanism controlled by chemisorption and pseudo-Fickian diffusion of water molecules but accelerates the equilibrium swelling ratio achievement. Also, there is no significant impact of a plasticizer on the water-holding properties of the synthesized superabsorbents at 80 °C, as well as on their reusability, which retains during several swelling-deswelling cycles. So, dibutyl succinate may be applied as an efficient plasticizer enhancing water sorption properties of the composite superabsorbents based on carboxymethyl cellulose sodium salt.

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Acknowledgments

FTIR, SEM, HPLC-MS, and XRD data were obtained with the use of equipment of the Research Core Centre of Voronezh State University. DSC data were obtained with the use of equipment of the Research Core Centre of Voronezh State University of Engineering Technologies. Special thanks to Dr. Alexander Sinelnikov and Dr. Alexey Dontsov for their help with obtaining and interpretation of the XRD data.

Funding

The research was supported by the Russian Science Foundation, project number 21–74-20053 (FTIR, SEM, HPLC–MS, and XRD research), and by the Ministry of Science and Higher Education of the Russian Federation in the framework of the national project “Science” (project FZGW-2020–0001, unique number of the register of State tasks 075001X39782002).

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Correspondence to Maria Lavlinskaya.

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Sorokin, A., Sukhanov, P., Popov, V. et al. A new approach to increasing the equilibrium swelling ratio of the composite superabsorbents based on carboxymethyl cellulose sodium salt. Cellulose 29, 159–173 (2022). https://doi.org/10.1007/s10570-021-04326-3

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  • DOI: https://doi.org/10.1007/s10570-021-04326-3

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