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Influence on the structure and the molecular mobility of cellulose–diamine complexes studied by a multiscale experimental approach

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Abstract

In this paper, the influence of diamines on the intrinsic structure and molecular mobility of cellulosic complexes is discussed. Cellulose was pre-swollen by ethylenediamine then put in contact with a series of aliphatic diamines at a stoechiometric ratio. These materials were then characterized by Wide Angle X-Ray diffraction (WAXS) and solid-state \(^{13}C\) NMR spectroscopy. It was observed by WAXS that diamines are able to swell cellulose along the (010) crystallographic plane and are able to modify unit cell angle \(\gamma \) of cellulose monoclinic structure. Moreover according to their periodicity, ordered- or disordered-phases structures were identified in such cellulosic complexes by Cross Polarization - Magic Angle Spinning (CP-MAS) \(^{13}C\) NMR spectroscpy. Two-dimensional Wide-line Separation (2D WISE) and \(T_1\) relaxation time \(^{13}C\) NMR spectroscopy experiments showed that complexes do exhibit molecular motions between 23 and 90\(^{\circ }\)C. Modulated Differential Scanning Calorymetry (MDSC) further showed the presence of two glass transition temperatures \(T_g\), which were attributed, in combination with the \(^{13}C\) NMR spectroscopy observations through a multiscale approach, to relaxation motions internal to the diamines chemical structure and to the motion of cellulose–diamine planes respectively.

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This work was funded by, and author A. Ríos de Anda received research support from Solvay.

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ARA and AE conducted the experiments, YN, KM, CV and LH supervised the project. All authors contributed to the writing and editing of the manuscript.

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Correspondence to Agustín Rios de Anda.

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This article is part of a collection of articles in honor of Dr. Henri Chanzy on the occasion of his 90th birthday. The article was not finished in time to be bound with the rest of the papers in the Special Issue #13, September, 2023

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de Anda, A.R., Ettori, A., Nishiyama, Y. et al. Influence on the structure and the molecular mobility of cellulose–diamine complexes studied by a multiscale experimental approach. Cellulose 31, 2713–2727 (2024). https://doi.org/10.1007/s10570-024-05786-z

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  • DOI: https://doi.org/10.1007/s10570-024-05786-z

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