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Title: Simultaneous bond degradation and bond formation during phenol-formaldehyde curing with wood

Source: WTCE 2016, World Conference on Timber Engineering; August 22-25; 2016, Vienna, Austria.

Author(s)Yelle, Daniel J.; Ralph, John

Publication Year: 2016  View PDF »

Category: Conference Proceedings
Associated Research Project(s):   FPL-4707-2B

Abstract: Bonding of wood using phenol–formaldehyde adhesive develops highly durable bonds. Phenol– formaldehyde is believed to form primary bonds with wood cell wall polymers (e.g., lignin). However, it is unclear how this adhesive interacts and bonds to lignin. Through wood solubilisation methodologies, earlywood and latewood bonded assemblies were characterized using two-dimensional 1H–13C solution-state nuclear magnetic resonance spectroscopy so that chemical modification of the wood cell wall polymers, after phenol–formaldehyde resol curing, could be elucidated. The results showed a marked depletion in native lignin and polysaccharide linkages via alkaline hydrolysis. What was also found was formation of methylene bridges between phenol–formaldehyde moieties and lignin, suggesting that bond degradation and bond formation occur at the same time during PF curing with wood.

Keywords: Phenol–formaldehyde, wood cell wall, lignin, curing mechanism, nuclear magnetic resonance

Publication Review Process: Informally Refereed (Peer-Reviewed)

File size: 1,024 kb(s)

Date posted: 10/04/2016

This publication is also viewable on Treesearch:  view
RITS Product ID: 82504
Current FPL Scientist associated with this product
Yelle, Daniel
Research Forest Products Technologist
  

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