Hydrothermally induced changes in the properties of MFC and characterization of the low molar mass degradation products

Salla Hiltunen (Corresponding Author), Krista Koljonen, Klaus Niemelä, Isto Heiskanen, Leena Sisko Johansson, Kaj Backfolk

Research output: Contribution to journalArticleScientificpeer-review

Abstract

The aim of this study was to determine hydrothermally induced changes in the physico-chemical properties of a fine microfibrillated cellulose (MFC). The MFC was prepared from a monocomponent endoglucanase-treated never-dried birch kraft pulp which had been run several times through a microfluidizer in order to obtain a sample substantially free from fibers or fiber fragments. The fine MFC was subjected to hydrothermal treatment at 150∘C for 0.5, 2.5, 4.5, 8.5 and 20.5 h, after which the viscosity, water-retention capacity, surface charge, discoloration and formation of hydrolysis products were determined. The viscosity, surface charge and water-retention capacity of MFC decreased as a result of the treatment but in oscillatory measurements the storage and loss moduli increased. Hydrothermal treatment also caused discoloration of the sample which could not be fully washed away with water. Surface analysis with XPS revealed no significant changes in the surface structure of the dried MFC cakes but the filtrates after the hydrothermal treatment were complex mixtures of sugars, organic acids and furans. The main degradation products detected were xylose and xylobiose, but isomerization products of sugars (xylulose, fructose) were also found in the filtrates. In addition numerous organic acids, including formic, glycolic, lactic and xylonic acid, were identified in the filtrates, showing that both acid and alkaline catalyzed reactions occur due to dissociation of water into H + and OH -.

Original languageEnglish
Number of pages17
JournalCellulose
DOIs
Publication statusPublished - Jul 2019
MoE publication typeA1 Journal article-refereed

Fingerprint

Molar mass
Cellulose
Degradation
Discoloration
Organic acids
Surface charge
Sugars
Water
Xylulose
Viscosity
Furans
Fructose
Acids
Xylose
Cellulase
Fibers
Kraft pulp
Surface analysis
Isomerization
Complex Mixtures

Keywords

  • Degradation
  • Hydrolysis
  • Hydrothermal treatment
  • Microfibrillated cellulose

Cite this

Hiltunen, Salla ; Koljonen, Krista ; Niemelä, Klaus ; Heiskanen, Isto ; Johansson, Leena Sisko ; Backfolk, Kaj. / Hydrothermally induced changes in the properties of MFC and characterization of the low molar mass degradation products. In: Cellulose. 2019.
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Hydrothermally induced changes in the properties of MFC and characterization of the low molar mass degradation products. / Hiltunen, Salla (Corresponding Author); Koljonen, Krista; Niemelä, Klaus; Heiskanen, Isto; Johansson, Leena Sisko; Backfolk, Kaj.

In: Cellulose, 07.2019.

Research output: Contribution to journalArticleScientificpeer-review

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T1 - Hydrothermally induced changes in the properties of MFC and characterization of the low molar mass degradation products

AU - Hiltunen, Salla

AU - Koljonen, Krista

AU - Niemelä, Klaus

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AU - Johansson, Leena Sisko

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N2 - The aim of this study was to determine hydrothermally induced changes in the physico-chemical properties of a fine microfibrillated cellulose (MFC). The MFC was prepared from a monocomponent endoglucanase-treated never-dried birch kraft pulp which had been run several times through a microfluidizer in order to obtain a sample substantially free from fibers or fiber fragments. The fine MFC was subjected to hydrothermal treatment at 150∘C for 0.5, 2.5, 4.5, 8.5 and 20.5 h, after which the viscosity, water-retention capacity, surface charge, discoloration and formation of hydrolysis products were determined. The viscosity, surface charge and water-retention capacity of MFC decreased as a result of the treatment but in oscillatory measurements the storage and loss moduli increased. Hydrothermal treatment also caused discoloration of the sample which could not be fully washed away with water. Surface analysis with XPS revealed no significant changes in the surface structure of the dried MFC cakes but the filtrates after the hydrothermal treatment were complex mixtures of sugars, organic acids and furans. The main degradation products detected were xylose and xylobiose, but isomerization products of sugars (xylulose, fructose) were also found in the filtrates. In addition numerous organic acids, including formic, glycolic, lactic and xylonic acid, were identified in the filtrates, showing that both acid and alkaline catalyzed reactions occur due to dissociation of water into H + and OH -.

AB - The aim of this study was to determine hydrothermally induced changes in the physico-chemical properties of a fine microfibrillated cellulose (MFC). The MFC was prepared from a monocomponent endoglucanase-treated never-dried birch kraft pulp which had been run several times through a microfluidizer in order to obtain a sample substantially free from fibers or fiber fragments. The fine MFC was subjected to hydrothermal treatment at 150∘C for 0.5, 2.5, 4.5, 8.5 and 20.5 h, after which the viscosity, water-retention capacity, surface charge, discoloration and formation of hydrolysis products were determined. The viscosity, surface charge and water-retention capacity of MFC decreased as a result of the treatment but in oscillatory measurements the storage and loss moduli increased. Hydrothermal treatment also caused discoloration of the sample which could not be fully washed away with water. Surface analysis with XPS revealed no significant changes in the surface structure of the dried MFC cakes but the filtrates after the hydrothermal treatment were complex mixtures of sugars, organic acids and furans. The main degradation products detected were xylose and xylobiose, but isomerization products of sugars (xylulose, fructose) were also found in the filtrates. In addition numerous organic acids, including formic, glycolic, lactic and xylonic acid, were identified in the filtrates, showing that both acid and alkaline catalyzed reactions occur due to dissociation of water into H + and OH -.

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