The investigation of rheological and strength properties of NFC hydrogels and aerogels from hardwood pulp by short catalytic bleaching (Hcat)

Ghazaleh Afsahi*, Katarina Dimic-Misic, Patrick Gane, Tatiana Budtova, Thaddeus Maloney, Tapani Vuorinen

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

4 Citations (Scopus)

Abstract

Alkaline washed nanofibrillated cellulose (NFC) was obtained via TEMPO-mediation of hardwood pulp which had been short catalytically bleached (Hcat) under a controlled range of conditions. With careful combination of bleaching conditions, together with the subsequent alkali pre-treatment prior to TEMPO oxidation, it is possible to reduce xylan content of Hcat hardwood birch pulps as compared to traditional elemental chlorine free (ECF) bleaching. The defined amount of xylan is seen to affect the static water-holding and agglomeration state of the respective NFC. It is shown that colloidal interactions between the nanofibrils are dependent on the amount of water present in the NFC hydrogels as water retained within xylan induced swelling of the fibrils that resulted in a weaker aerogel structure.

Original languageEnglish
Pages (from-to)1637–1655
Number of pages19
JournalCellulose
Volume25
Issue number3
Early online date9 Feb 2018
DOIs
Publication statusPublished - Feb 2018
MoE publication typeA1 Journal article-refereed

Keywords

  • Aerogel
  • H bleaching
  • Mechanical properties of aerogels
  • Nanocellulose
  • Rheology
  • Water sorption
  • Xylan content

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