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Non-freezing water sorbed on microcrystalline cellulose studied by high-resolution thermogravimetric analysis

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Abstract

Knowing the nature of water-cellulose interactions is a key factor in understanding cellulose properties and developing new processing strategies. The emergence of new advanced materials based on nanocelluloses requires more precise methods to study these systems. Here we described the study of water-cellulose interaction by high-resolution thermogravimetric analysis (TGA), comparing dynamic and auto stepwise methods. Auto stepwise method was able to identify with precision three different types of non-freezing water, which we denoted as, (I) weakly bound water, (II) intermediate and (III) strongly bound water. The Ozawa-Flynn-Wall method was used to estimate the activation energy of strongly bound water desorption, Ea average = 50.45 kJ.mol−1 and the cellulose degradation energy, Ea average = 143.18 kJ.mol−1. The results obtained provide a new knowledge about the interaction between water and cellulose since other techniques such as DSC are not sensitive to non-freezing bound water.

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Acknowledgements

This study was financed in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior—Brasil (CAPES)—Finance Code 001. Authors acknowledge CNPq for research funding project # 03847/2019-0.

Funding

This work was supported by Coordenação de Aperfeiçoamento de Pessoal de Nível Superior—Brasil (CAPES) – Grant Number: Finance Code 001 and financial support to AJFC from CNPq for research funding project Grant Number 03847/2019–0.

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The manuscript was written through contributions of all authors. All authors have given approval to the final version of the manuscript.

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Correspondence to Antonio José Felix Carvalho.

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Kramer, R.K., Carvalho, A.J.F. Non-freezing water sorbed on microcrystalline cellulose studied by high-resolution thermogravimetric analysis. Cellulose 28, 10117–10125 (2021). https://doi.org/10.1007/s10570-021-04189-8

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  • DOI: https://doi.org/10.1007/s10570-021-04189-8

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