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Examination of the Penetration of Polymeric Methylene Di-Phenyl-Di-Isocyanate (pMDI) into Wood Structure Using Chemical-State X-Ray Microscopy

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Published/Copyright: June 1, 2005
Holzforschung
From the journal Volume 56 Issue 2

Summary

The penetration behaviour of isocyanate-based wood resins was evaluated using x-ray microscopy. Aspen wood pieces were bonded together in a controlled manner. These were embedded in a methacrylate-based resinand thin sections were prepared, cut from the transverse face of thewoodcomposite. X-ray images of these sections were prepared at several selected x-ray energies to allow the isocyanate, cellulose, lignin and the embedding agent distributions to be mapped. The isocyanate resin was found to penetrate deeply into the wood. The resin enters large cell lumen, and wicks along the inner cell wall surfaces. The resin accesses connected cells via connecting pits, which become filled with the resin. The affinity of the isocyanate to the inner surfaces of the large cells is probably due to the hydrophobicity of these surfaces. Isocyanate resins do not penetrate into the smaller parenchyma and tracheid cells and indeed do not even wet the inner surfaces of these cells where isocyanate entry has been allowed due to damage of the cell at the macroscopic surface of the wood. If isocyanates penetrate into the wood-cell walls of the large cells, the concentration in the cell walls has been determined to be less than 2%of the bulk concentration. This lower limit is the sensitivity limit imposed by photon statistics in the data.

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Published Online: 2005-06-01
Published in Print: 2002-03-12

Copyright © 2002 by Walter de Gruyter GmbH & Co. KG

Articles in the same Issue

  1. High Variability in the Thickness of the S3 Layer in Pinus radiata Tracheids
  2. Intra- and Inter-Tree Variability of Moisture Content in Standing Sessile Oak (Quercus petraea Liebl.)
  3. Depletion of CCA-C from Ground-Contact Wood: Results from Two Field Sites with Significantly Different Soils
  4. Reaction Characteristics on the Green Surface of Moso Bamboo (Phyllostachys pubescens Mazel) Treated with Chromated Phosphate
  5. The Organosolv Fractionation of Cork Components
  6. Identification of New Hydroxy Fatty Acids and Ferulic Acid Esters in the Wood of Eucalyptus globulus
  7. The Pyridine-Catalysed Acylation of Pine Sapwood and Phenolic Model Compounds with Carboxylic Acid Anhydrides. Determination of Activation Energies and Entropy of Activation
  8. Characterization of the Residual Lignins in Pinus taeda Biodegraded by Ceriporiopsis subvermispora by Using in situ CuO Oxidation and DFRC Methods
  9. Klason Lignin: Modifications to Improve the Precision of the Standardized Determination
  10. Softwood Bark Pyrolysis Oil-PF Resols. Part 1. Resin Synthesis and OSB Mechanical Properties
  11. Surface Area Characterization of Several Woodpulps by Humidity Adsorption
  12. A Comparative CP/MAS 13C-NMR Study of the Supermolecular Structure of Polysaccharides in Sulphite and Kraft Pulps
  13. Mass Transfer Characteristics of Western Hemlock and Western Red Cedar
  14. Fracture Behaviour of Modified Spruce Wood: A Study Using Linear and Non Linear Fracture Mechanics
  15. Instabilities in the System NMMO/Water/Cellulose (Lyocell Process) Caused by Polonowski Type Reactions
  16. Effects of Retention and Distribution of Fire Retardant Chemical on Performance of Fire Retardant Treated China Fir (Cunninghamia lanceolata) Wood
  17. Examination of the Penetration of Polymeric Methylene Di-Phenyl-Di-Isocyanate (pMDI) into Wood Structure Using Chemical-State X-Ray Microscopy
  18. Literature Reports
https://doi.org/10.1515/HF.2002.035

Articles in the same Issue

  1. High Variability in the Thickness of the S3 Layer in Pinus radiata Tracheids
  2. Intra- and Inter-Tree Variability of Moisture Content in Standing Sessile Oak (Quercus petraea Liebl.)
  3. Depletion of CCA-C from Ground-Contact Wood: Results from Two Field Sites with Significantly Different Soils
  4. Reaction Characteristics on the Green Surface of Moso Bamboo (Phyllostachys pubescens Mazel) Treated with Chromated Phosphate
  5. The Organosolv Fractionation of Cork Components
  6. Identification of New Hydroxy Fatty Acids and Ferulic Acid Esters in the Wood of Eucalyptus globulus
  7. The Pyridine-Catalysed Acylation of Pine Sapwood and Phenolic Model Compounds with Carboxylic Acid Anhydrides. Determination of Activation Energies and Entropy of Activation
  8. Characterization of the Residual Lignins in Pinus taeda Biodegraded by Ceriporiopsis subvermispora by Using in situ CuO Oxidation and DFRC Methods
  9. Klason Lignin: Modifications to Improve the Precision of the Standardized Determination
  10. Softwood Bark Pyrolysis Oil-PF Resols. Part 1. Resin Synthesis and OSB Mechanical Properties
  11. Surface Area Characterization of Several Woodpulps by Humidity Adsorption
  12. A Comparative CP/MAS 13C-NMR Study of the Supermolecular Structure of Polysaccharides in Sulphite and Kraft Pulps
  13. Mass Transfer Characteristics of Western Hemlock and Western Red Cedar
  14. Fracture Behaviour of Modified Spruce Wood: A Study Using Linear and Non Linear Fracture Mechanics
  15. Instabilities in the System NMMO/Water/Cellulose (Lyocell Process) Caused by Polonowski Type Reactions
  16. Effects of Retention and Distribution of Fire Retardant Chemical on Performance of Fire Retardant Treated China Fir (Cunninghamia lanceolata) Wood
  17. Examination of the Penetration of Polymeric Methylene Di-Phenyl-Di-Isocyanate (pMDI) into Wood Structure Using Chemical-State X-Ray Microscopy
  18. Literature Reports
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