Monitoring molecular dynamics of bacterial cellulose composites reinforced with graphene oxide by carboxymethyl cellulose addition

M. J. Sanchis, M. Carsí, C. M. Gómez, M. Culebras, K. N. Gonzales, F. G. Torres

Research output: Contribution to journalArticlepeer-review

27 Scopus citations

Abstract

Broadband Dielectric Relaxation Spectroscopy was performed to study the molecular dynamics of dried Bacterial Cellulose/Carboxymethyl Cellulose-Graphene Oxide (BC/CMC-GO) composites as a function of the concentration of CMC in the culture media. At low temperature the dielectric spectra are dominated by a dipolar process labelled as a β-relaxation, whereas electrode polarization and the contribution of dc-conductivity dominate the spectra at high temperatures and low frequency. The CMC concentration affects the morphological structure of cellulose and subsequently alters its physical properties. X-ray diffractometry measurements show that increasing the concentration of CMC promotes a decrease of the Iα/Iβ ratio. This structural change in BC, that involves a variation in inter- and intramolecular interactions (hydrogen-bonding interactions), affects steeply their molecular dynamics. So, an increase of CMC concentration produces a significantly decrease of the β-relaxation strength and an increase of the dc-conductivity.

Original languageEnglish
Pages (from-to)353-360
Number of pages8
JournalCarbohydrate Polymers
Volume157
DOIs
StatePublished - 10 Feb 2017

Keywords

  • Bacterial cellulose composites
  • Dielectric relaxation spectroscopy
  • Thermal stability

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