Foaming and cross-linking of cellulose fibers using phytic acid

E. Orzan, A. Barrio, V. Biegler, J. B. Schaubeder, A. Bismarck, S. Spirk, T. Nypelö*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Bio-based compounds have become the focus in the development of next-generation materials. The polyphosphated structure and availability of phytic acid has sparked an interest to understand its properties and apply it to making fire-retardant fabrics. However, its degradative effect on natural fibers sets limitations to its potential uses. In this study, we unveiled a new dimension to explore with phytic acid: cellulose fiber foams. Phytic acid enabled synergistic foaming with carboxymethyl cellulose albeit causing issues in long-term wet foam stability. Adding cellulose fibers to this mixture and drying at 160 °C produced solid foams with increased compressive strength and stiffness; comparable to foams cross-linked with the commonly used citric acid. The reduced contact area in low-density fiber networks allowed the cross-linking between phytic acid and the fiber network to mitigate structural weakening due to fiber degradation. Imaging also revealed the formation of a film encompassing fiber bonds; attributed to the strong interaction between phytic acid and carboxymethyl cellulose. Furthermore, phytic acid imparted self-extinguishing fire-retardant properties to the cellulose fiber foams measured using thermogravimetric analysis and cone calorimetry. This work showcases a simple new application for phytic acid without the use of catalysts or solvents. It serves to encourage further development of green practices to continuously challenge the industrial landscape.

Original languageEnglish
Article number122617
JournalCarbohydrate Polymers
Volume347
DOIs
Publication statusPublished - 1 Jan 2025

Keywords

  • Biopolymer
  • Cellular solid
  • Flame retardant
  • Frothing
  • Phosphate
  • Porous network

Fingerprint

Dive into the research topics of 'Foaming and cross-linking of cellulose fibers using phytic acid'. Together they form a unique fingerprint.

Cite this