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Article Dans Une Revue ACS Sustainable Chemistry & Engineering Année : 2023

Regioselective Modification at Reducing End Aldehydes of Cellulose Nanocrystals and Mercerization

Lei Tan
  • Fonction : Auteur
Ge Zhu
  • Fonction : Auteur
Ning Lin

Résumé

Receiving considerable interest in recent years, the reducing ends of cellulose nanocrystals (CNCs) with heterogeneous groups and different reactivity from surface chemistry contribute to the development of new strategies for regioselective modification and performance tailoring for this building block of natural biomass. However, the understanding of the phenomena involved at the reducing end is still at the research stage for cellulose chains, usually in dissolved form in a solvent, but lacks extensive investigation for nanocrystals, existing in the form of suspensions. Two issues are explored in this study. The first one concerns the comprehensive analysis of various conditions and parameters for the introduction of aldehyde groups at the reducing end of CNCs. The second investigates the influence of end-modified species on the crystalline reconfiguration of nanocrystals during mercerization. Quantitative measurements of the content of reducing end aldehyde groups are carried out for nine nanocellulose samples, offering scientific evidence to obtain more aldehyde groups available at the reducing end of CNCs for future studies. Furthermore, four species of CNCs with various chemical structures and macroscopic properties are modified at the reducing ends, and their reorganization as type-II nanocrystals during mercerization is investigated. The results indicate a critical effect of the steric hindrance of end species on the crystalline reconfiguration of nanocrystals, providing inspiration for a possible molecular structure and asymmetric modification for this ageless nanomaterial.
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Dates et versions

hal-04098645 , version 1 (16-05-2023)

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Citer

Lei Tan, Alain Dufresne, Ge Zhu, Ning Lin. Regioselective Modification at Reducing End Aldehydes of Cellulose Nanocrystals and Mercerization. ACS Sustainable Chemistry & Engineering, 2023, 11 (11), pp.4485-4497. ⟨10.1021/acssuschemeng.2c07713⟩. ⟨hal-04098645⟩

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