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

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

julkaisussa: Cellulose, 18.07.2019.

Tutkimustuotos: Lehtiartikkeli

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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. Julkaisussa: Cellulose. 2019.

Bibtex - Lataa

@article{5beee4abaa2e4acdb75f1c6dbaf93ac8,
title = "Hydrothermally induced changes in the properties of MFC and characterization of the low molar mass degradation products",
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 -.",
keywords = "Degradation, Hydrolysis, Hydrothermal treatment, Microfibrillated cellulose",
author = "Salla Hiltunen and Krista Koljonen and Klaus Niemel{\"a} and Isto Heiskanen and Johansson, {Leena Sisko} and Kaj Backfolk",
year = "2019",
month = "7",
day = "18",
doi = "10.1007/s10570-019-02603-w",
language = "English",
journal = "Cellulose",
issn = "0969-0239",

}

RIS - Lataa

TY - JOUR

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

AU - Heiskanen, Isto

AU - Johansson, Leena Sisko

AU - Backfolk, Kaj

PY - 2019/7/18

Y1 - 2019/7/18

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 -.

KW - Degradation

KW - Hydrolysis

KW - Hydrothermal treatment

KW - Microfibrillated cellulose

UR - http://www.scopus.com/inward/record.url?scp=85069441944&partnerID=8YFLogxK

U2 - 10.1007/s10570-019-02603-w

DO - 10.1007/s10570-019-02603-w

M3 - Article

JO - Cellulose

JF - Cellulose

SN - 0969-0239

ER -

ID: 35738051