Title

Sustainable-solvent-induced polymorphism in chitin films

Document Type

Article

Publication Date

1-1-2016

Abstract

This journal is © 2016 The Royal Society of Chemistry. We report a simple route to produce chitin films with different crystalline structures. The use of a green deep-eutectic-solvent (DES) choline chlorideurea (CCU) or hexafluoroisopropanol (HFIP) allows fine-tuning of the crystallization process to produce films with β-dihydrated- or γ-chitin structures. With the advent of a Grazing-Incidence X-Ray Diffraction (GIXD) technique, we propose a new and fully indexed structure of γ-chitin. This new γ-structure is modeled as a super-cell, in contrast to the idea of a simple physical mixture of α and β phases. The influence of purification, dissolution or dispersion media on chitin's crystallinity was investigated by FTIR, solid-state NMR and XRD. Results presented here may trigger applications in which a well-defined crystalline structure is required.

Publication Source (Journal or Book title)

Green Chemistry

First Page

4303

Last Page

4311

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