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Factors Affecting Crystalline Structure of Cellulose during Solvent Purification Treatment

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Published/Copyright: June 1, 2005
Holzforschung
From the journal Volume 53 Issue 1

Summary

The influence of acetone, as a solvent on crystalline structure of the cellulose, was investigated. Crystalline changes brought about by the solvent treatment on the residual cellulose have been foundto be noticable. The crystallinity index of solvent treated celluloses has shown a trend of a small gradual increase with the progressive increase of acetone concentration in the treatment. The crystallite size of the residual cellulose has also been found to decrease successively with the increase of acetone content in the solvent composition. While the decrease in crystallite size reached approximately 8 %, the equivalent weight loss was only about 0.9 %.

The influence of kinetic parameters on crystalline structure of cellulose during solvent purification (e. g., temperature, reaction time, acidity and type of acid catalyst) was also examined. Acidity and acid catalyst type were found to contribute to crystalline structural changes of cellulose. The use of higher concentrations for acids (TFA, HCl) has led to a decrease in crystallite size and crystallinity index. However, lower concentrations of TFA have a positive impact on the crystallinity index of the treated cotton cellulose. The crystallinity index of the residual cellulose has shown a slight increase with the increase in temperature, while the crystallite size has indicated a successive decrease. The reaction time has offered, in general, better chances for enhancement of the crystallinity index of the cellulose.

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Published Online: 2005-06-01
Published in Print: 1999-01-01

Copyright (c)1999 by Walter de Gruyter GmbH & Co. KG

Articles in the same Issue

  1. Factors Affecting Crystalline Structure of Cellulose during Solvent Purification Treatment
  2. Rupture of Pit Membranes in Sugi (Cryptomerica japanica D. Don) Logs by a Smoke Heating System with Increased Far-Infrared Radiation
  3. Fungal Treatment of Aspen for Wood Resin Reduction: Effect on Aged Aspen Wood Chips at Room Temperature and at 5°C
  4. Hydroxyl Radical Generation by an Extracellular Low-Molecular-Weight Substance and Phenol Oxidase Activity During Wood Degradation by the White-Rot Basidiomycete Phanerochaete chrysosporium
  5. Industrial Utilization of Tobacco Stalks (1) Preliminary Evaluation for Biomass Resources
  6. Characterization of Lignin-Carbohydrate Fractions Isolated from the Wood Parasite Cistance deserticola Y.C. Ma
  7. Acid Reactions of Lignin Models of β-5 Type
  8. A New Approach Towards the Yellowing Inhibition of Mechanical Pulps. Part I: Selective Removal of α-Hydroxyl and α-Carbonyl Groups in Lignin Model Compounds
  9. Atmospheric Acetic Acid Pulping of Rice Straw II: Behavior of Ash and Silica in Rice Straw during Atmospheric Acetic Acid Pulping and Bleaching
  10. Variability of Suberin Composition of Reproduction Cork from Quercus suber Throughout Industrial Processing
  11. The Effects of Water Soluble Extractives on the Acoustic Properties of Reed (Arundo donax L.)
  12. Wood Moisture Gradient Analysis by Electrical Impedance Spectroscopy
  13. Non-Darcian Air Flow in Wood. Part 2. Nonlinear Flow
  14. Non-Darcian Air Flow in Wood. Part 3. Molecular Slip Flow
  15. Laser Ablation of Machined Wood Surfaces. 1. Effect on End-Grain Gluing of Pine (Pinus silvestris L.) and Spruce (Picea abies Karst.)
  16. A Study of Ordinary Portland Cement Hydration With Wood by Isothermal Calorimetry
  17. Literature Reports
https://doi.org/10.1515/HF.1999.001

Articles in the same Issue

  1. Factors Affecting Crystalline Structure of Cellulose during Solvent Purification Treatment
  2. Rupture of Pit Membranes in Sugi (Cryptomerica japanica D. Don) Logs by a Smoke Heating System with Increased Far-Infrared Radiation
  3. Fungal Treatment of Aspen for Wood Resin Reduction: Effect on Aged Aspen Wood Chips at Room Temperature and at 5°C
  4. Hydroxyl Radical Generation by an Extracellular Low-Molecular-Weight Substance and Phenol Oxidase Activity During Wood Degradation by the White-Rot Basidiomycete Phanerochaete chrysosporium
  5. Industrial Utilization of Tobacco Stalks (1) Preliminary Evaluation for Biomass Resources
  6. Characterization of Lignin-Carbohydrate Fractions Isolated from the Wood Parasite Cistance deserticola Y.C. Ma
  7. Acid Reactions of Lignin Models of β-5 Type
  8. A New Approach Towards the Yellowing Inhibition of Mechanical Pulps. Part I: Selective Removal of α-Hydroxyl and α-Carbonyl Groups in Lignin Model Compounds
  9. Atmospheric Acetic Acid Pulping of Rice Straw II: Behavior of Ash and Silica in Rice Straw during Atmospheric Acetic Acid Pulping and Bleaching
  10. Variability of Suberin Composition of Reproduction Cork from Quercus suber Throughout Industrial Processing
  11. The Effects of Water Soluble Extractives on the Acoustic Properties of Reed (Arundo donax L.)
  12. Wood Moisture Gradient Analysis by Electrical Impedance Spectroscopy
  13. Non-Darcian Air Flow in Wood. Part 2. Nonlinear Flow
  14. Non-Darcian Air Flow in Wood. Part 3. Molecular Slip Flow
  15. Laser Ablation of Machined Wood Surfaces. 1. Effect on End-Grain Gluing of Pine (Pinus silvestris L.) and Spruce (Picea abies Karst.)
  16. A Study of Ordinary Portland Cement Hydration With Wood by Isothermal Calorimetry
  17. Literature Reports
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