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Gelation of Cellulose Derivatives: Searching for ionic liquid paper
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Resumo(s)
Cellulose is the world’s most abundant, biocompatible, non-toxic, biodegradable polymer
obtained from renewable sources. However its dissolution problems hampers a
more generalized application. ILs are generally defined as organic/inorganic salts with a
melting point lower than 100 C which present a good solubility for polar and non-polar
compounds such as organic, inorganic or polymeric materials like cellulose. Cellulose
solvents are scarce and, as such, the modification of its properties is a challenge.
In this dissertation the main goal was to combine some of the unique IL’s properties
with the intrinsic cellulose features. Thus, our strategy was to synthesize cellulose
derivatives that enable the dissolution process in order to, later on, obtain a polymer gel.
In the first stage we obtained ionic liquid grafted cellulose derivatives. Afterwards, we
performed an extensive solubilization study to select the appropriate conditions to obtain
the gel state. To further understand the solvents’ dynamics and their relevance in the
gelation process, these conditions were followed by NMR and Rheology.
The obtained results allowed the proposal of a gelation model for these cellulosic
polymers. The proposed strategy could be a starting point to design and produce Ionic
Liquid Paper (ILP), a material that could have potential for electrochemical applications.
Descrição
Palavras-chave
Cellulose Cellulose derivatives polymer ionic liquid Gels Nuclear Magnetic Resonance Rheology