Tuning the rheological properties of cellulosic ionogels reinforced with chitosan: The role of the deacetylation degree

M Mar Villar-Chavero; Juan C Domínguez; M Virginia Alonso; Mercedes Oliet; Francisco Rodriguez

doi:10.1016/j.carbpol.2018.12.041

Tuning the rheological properties of cellulosic ionogels reinforced with chitosan: The role of the deacetylation degree

Carbohydr Polym. 2019 Mar 1:207:775-781. doi: 10.1016/j.carbpol.2018.12.041. Epub 2018 Dec 17.

Authors

M Mar Villar-Chavero¹, Juan C Domínguez², M Virginia Alonso³, Mercedes Oliet⁴, Francisco Rodriguez⁵

Affiliations

¹ Chemical Engineering and Materials Department, Complutense University of Madrid, Av. Complutense S/N, 28040, Madrid, Spain. Electronic address: mdm.villar@ucm.es.
² Chemical Engineering and Materials Department, Complutense University of Madrid, Av. Complutense S/N, 28040, Madrid, Spain. Electronic address: jucdomin@ucm.es.
³ Chemical Engineering and Materials Department, Complutense University of Madrid, Av. Complutense S/N, 28040, Madrid, Spain. Electronic address: valonso@ucm.es.
⁴ Chemical Engineering and Materials Department, Complutense University of Madrid, Av. Complutense S/N, 28040, Madrid, Spain. Electronic address: moliet@ucm.es.
⁵ Chemical Engineering and Materials Department, Complutense University of Madrid, Av. Complutense S/N, 28040, Madrid, Spain. Electronic address: frsomol@ucm.es.

PMID: 30600064
DOI: 10.1016/j.carbpol.2018.12.041

Abstract

The rheological and thermal properties of formulated cellulosic ionogels reinforced with chitosan with 54-84% deacetylation degrees (DDs) were studied. The ionogels were stable, and the linear viscoelastic regions (LVRs) were determined. The rheological spectra of the ionogels revealed strong physical gels. Moreover, the effect of the DD on the viscoelastic properties was significant. The ionogel reinforced with chitosan with a DD of 84% exhibited the greatest viscoelastic properties (G': ∼10.6 kPa, G": 20.6-1.7 kPa, and η*: 200-0.05 kPa s). The ionogels exhibited the same glass transition temperature, which was approximately -98 °C, and a melting temperature of 40 °C. In addition, these materials were shown to be thermoreversible. This study provided basic rheological and thermal evidence that could be used to design new ionogels reinforced with chitosan with a specific DD for use as scaffolds for wound management.

Keywords: Cellulose; Chitosan; Deacetylation degree; Ionogel; Reinforcement; Rheology.