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Effect of rheological properties of dissolved cellulose/microfibrillated cellulose blend suspensions on film forming

Research output: Contribution to journalArticleScientificpeer-review

Details

Original languageEnglish
Pages (from-to)62-70
Number of pages9
JournalCarbohydrate Polymers
Volume119
DOIs
Publication statusPublished - 30 Mar 2015
Publication typeA1 Journal article-refereed

Abstract

Enzymatically treated cellulose was dissolved in a NaOH/ZnO solvent system and mixed together with microfibrillated cellulose (MFC) in order to find the threshold in which MFC fibers form a percolation network within the dissolved cellulose solution and in order to improve the properties of regenerated cellulose films. In the aqueous state, correlations between the rheological properties of dissolved cellulose/MFC blend suspensions and MFC fiber concentrations were investigated and rationalized. In addition, rheological properties of diluted MFC suspensions were characterized and a correlation with NaOH concentration was found, thus partly explaining the flow properties of dissolved cellulose/MFC blend suspensions. Finally, based on results from Dynamic Mechanical Analysis (DMA), MFC addition had strengthening/plasticizing effect on regenerated cellulose films if low concentrations of MFC, below the percolation threshold (5.5-6 wt%, corresponding to 0.16-0.18 wt% of MFC in the blend suspensions), were used.

Keywords

  • Blend, Dissolved cellulose, Microfibrillated cellulose, Rheology, Suspension

Publication forum classification

Field of science, Statistics Finland