• Sedlmair, J.
• Frihart, Chuck
• Hirschmugl, Carol
• Illman, Barbara
• Hunt, Christopher
• Grigsby, Warren
• Jakes, Joseph

Abstract

Despite the use of adhesives in a wide range of wood-based materials,such as medium density fiber board and plywood,the wood-adhesive bondline is still not well understood. For instance,it is believed that for some adhesives infiltration of the adhesive into wood cell walls is vital to bondline durability. However,optimal amount of adhesive infiltration and how the infiltrated adhesive modifies the wood cell wall is not understood. A key to improved understanding of wood-adhesive interactions is to develop methods to identify when an adhesive infiltrates into a cell wall and to quantify the amount of infiltrated adhesive. Here,we utilize UW-SRC facility Infrared Environmental Imaging(IRENI)to collect chemical images of phenol formaldehyde(PF)-wood bondlines. From the IRENI images,PF infiltration is identified and quantified in latewood loblolly pine(Pinus taeda)cell walls. To better understand how the infiltrated PF modifies cell wall properties,nanoindentation is used to assess hardness and elastic modulus of the same cell walls imaged with IRENI. Changes in mechanical properties are compared directly to the amount of PF infiltration.

Topics

• density
• impedance spectroscopy
• hardness
• nanoindentation
• durability
• wood