Effect of Supercritical Carbon Dioxide Treatment on Gas Permeability of Paulownia Fortunei Heartwood and Sapwood


  • Huadong Xu Northeast Forestry University
  • Hamid Reza Taghiyari Faculty of Civil Engineering Wood Science and Technology Department Shahid Rajaee Teacher Training University
  • Milo Clauson Department of Wood Science & Engineering Oregon State University Corvallis, OR 97331
  • Michael R Milota Department of Wood Science & Engineering Oregon State University Corvallis, OR 97331
  • Jeffrey J Morrell Oregon State University


Paulownia fortunei, tyloses, permeability, supercritical carbon dioxide


Many wood species are resistant to penetration of liquids. Impermeability can affect a variety of properties including the ability to deliver preservatives, adhesive bonding, and coating applications.  Developing methods for altering this characteristic could help in utilization of impermeable species.  One method for altering wood properties is through the use of supercritical carbon dioxide (SC-CO2) which can solubilize a wide range of organic compounds. In this report, we examined the ability of varying SC-CO2 conditions to improve the permeability of Paulownia fortunei. All of the processes tested improved gas permeability and most reduced the frequency of tyloses in the vessels. The results suggest that SC-CO2 could be used to modify the permeability of this species.


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Research Contributions