Consolidation of cellulose nanofibrils with lignosulphonate bio-waste into excellent flame retardant and UV blocking membranes

Urška Jančič, Matej Bračič, Alenka Ojstršek, Mojca Božič, Tamilselvan Mohan, Selestina Gorgieva*

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

The use of biomass to produce value-adding materials is a core objective of the circular economy, which has attracted great research interest in recent decades. In this context, we present here a simple dispersion-casting process for consolidation of cellulose nanofibrils (CNF), lignosulphonate (LS)-rich bio-waste and CaCl2 in composite membranes. The addition of CaCl2 to CNF and LS dispersions reduces the ζ potential, due to an electrostatic screening, which promotes the aggregation of CNF, increases its moisture content and promotes LS deposition on CNFs already in the dispersion phase. Addition of both the LS and CaCl2 to CNF dispersion has an adverse effect on the mechanical properties of the final membranes. The effectiveness of the new composite membranes has been described in terms of their passive (charring) flame retardancy and 100 % UVA/UVB shielding capacity, both identified for membranes with the highest LS content, as well as high electronic resistance.

Original languageEnglish
Article number117126
JournalCarbohydrate Polymers
Volume251
DOIs
Publication statusPublished - 1 Jan 2021

Keywords

  • Cellulose nanofibrils
  • Flame retardancy
  • Lignosulphonate
  • Membranes
  • UV shielding

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry

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