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Optimization of the methacrylation of carboxymethylcellulose and use for the design of hydrogels and cryogels with controlled structure and properties

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Abstract

Carboxymethylcellulose (CMC) was functionalized using methacrylic anhydride (MA) to produce photo-crosslinkable methacrylated carboxymethylcellulose (mCMC). Optimization of the synthesis led to a wide range of mCMC samples with well-controlled degrees of methacrylation up to 76 ± 6%, surpassing the literature data. Aqueous mCMC formulations with different DM and concentrations of mCMC were UV-cured to obtain hydrogels, which were transformed into cryogels after freeze-drying. An innovative 13C CP-MAS solid-state NMR methodology was used to calculate the crosslinked methacrylate density in cryogels and thus in hydrogels. These values (from 4.3 \(\times\) 10–3 to 1.3 \(\times\) 10–2 mmol/cm3) were correlated with both the DM and the mCMC concentration in formulations. These parameters were used to control the material microstructure and rheological properties. As a result, the swelling ratio of hydrated cryogels could be modulated for applications requiring high or low water absorption. Moreover, it was shown that the elastic moduli G’ of the hydrated cryogels were superior to those of the original hydrogels, over the entire frequency range (0.1–10 Hz).

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Acknowledgements

The authors acknowledge the NanoBio chemistry platform (ICMG UAR 2607) for granting access to the electron microscopy facilities. The authors also acknowledge Ashland for kindly offering carboxymethylcellulose.

Funding

Financial support from the cross cutting CEA program ‘Matériaux Procédés’ is gratefully acknowledged (CelluloMed project). The authors acknowledge the Agence Nationale de la Recherche for financial support through the LabEx ARCANE program (ANR-11-LABX-0003-01) and the Graduate School of Chemistry, Biology and Health of University Grenoble Alpes CBH-EUR-GS (ANR-17-EURE-0003) and Glyco@Alps. The authors acknowledge the NanoBio-ICMG chemistry platform (FR 2607, Grenoble) for granting access to the electron microscopy facilities.

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All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by LS, SR, BJ, IT, GN, P-AB and CL-P. The first draft of the manuscript was written by LS and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Guillaume Nonglaton.

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Soullard, L., Bayle, PA., Lancelon-Pin, C. et al. Optimization of the methacrylation of carboxymethylcellulose and use for the design of hydrogels and cryogels with controlled structure and properties. Cellulose 30, 6203–6217 (2023). https://doi.org/10.1007/s10570-023-05266-w

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  • DOI: https://doi.org/10.1007/s10570-023-05266-w

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