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- Title
Non-freezing water sorbed on microcrystalline cellulose studied by high-resolution thermogravimetric analysis.
- Authors
Kramer, Ricardo Klaus; Carvalho, Antonio José Felix
- 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.
- Subjects
THERMOGRAVIMETRY; CELLULOSE; ENERGY dissipation
- Publication
Cellulose, 2021, Vol 28, Issue 16, p10117
- ISSN
0969-0239
- Publication type
Article
- DOI
10.1007/s10570-021-04189-8