Banner for LabNotes
From Lab Notes
Contact Information
Forest Products Laboratory
One Gifford Pinchot Drive
Madison, WI 53726-2398
Phone: (608) 231-9200
Fax: (608) 231-9592
Email

 

You are here: FPL Home  / Information Products & Services  / Publications

Requested Product

Title: Mechanical Characterization of Wood-Adhesive Interphase with an Improved Nanoindentation Technique

Source: In: Proceedings of the 55th International convention of Society of Wood Science Technology, August 27-31, 2012 - Beijing, China. p. 6.

Author(s)Yu, Yan; Frihart, C.R.; Jakes, J.E.; Jiang, Z.H.

Publication Year: 2012  View PDF »

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

Abstract: An improved nanoindentation method was used to assess the hardness and elastic modulus of the bulk adhesive and wood cell walls within wood-adhesive bondlines. Improvements include a specimen preparation technique that does not require any embedment. Also, a structural compliance method was used to remove from the nanoindentation measurements artifacts arising from edges near to the nanoindents and specimen-scale flexing. Interphases between southern pine and the four adhesives phenol formaldehyde (PF), urea formaldehyde (UF), epoxy, and emulsion polymer isocyanate (EPI) were characterized. The hardness of PF was measured to be 0.87 GPa, nearly 2-3 times larger than UF, epoxy and EPI. The elastic modulus of PF was 8.8 GPa, comparable to that of UF but nearly 2-3 times larger than that of epoxy and EPI. Furthermore, we observed that the hardness of wood cell walls increased near the adhesive line for PF and UF bondlines, which strongly supports the idea that some low-molecular components of PF and UF infiltrate into the wood cell wall and improve its mechanical performances after curing. Similar increases were not found for epoxy and EPI bondines. Our results support that the widely known durable and strong bonding of wood with PF is related to the excellent mechanical performances of PF resin itself and its ability of infiltrate into and reinforce wood cell walls.

Keywords: wood bonding; interphase; nanoindentation; adhesive

Publication Review Process: Non-Refereed (Other)

File size: 218 kb(s)

Date posted: 08/26/2013
RITS Product ID: 64947
Current FPL Scientists associated with this product (listed alphabetically)
Frihart, Charles R.
Research Chemist
Jakes, Joseph
Research Materials Engineer
 

Additional items that might interest you
View the video celebrating FPL's 100 years of public service in 2010, from the producers of the Greatest Good....view

Research Highlights from FPL....view

Termite Eradication: A search for the Holy Grail.... view

Moisture Management in Residential Construction Series videos...view

Wood Floor Systems in Residential Construction Series videos....view
- FPL's Mission and Strategic Plan -

FPL's mission is to identify and conduct innovative wood and fiber utilization research that contributes to conservation and productivity of the forest resource, thereby sustaining forests, the economy, and quality of life. ... ..more »

- FPL Research Emphasis Areas -
Advanced Composites

As an integral part of the FPL mission, we improve the long-term sustainability of our Nation's forests by creating valuable composite products from biobased materials ... ..more »


Advanced Structures

The FPL has been in the forefront of wood-frame housing research since 1910 and has long been recognized as a world leader in such housing-related areas as engineered wood ... ..more »


Forest Biorefinery

We all know the compelling reasons that the United States needs to reduce its dependence on fossil fuels. Historically, the greatest increases in energy demand have been for transportation fuels ... ..more »


Nanotechnology

A leader in wood products research for over a century, the FPL is positioning itself to become the lead Federal research facility for the application of nanotechnology in forest products ... more »


Woody Biomass Utilization

Forests in the United States contain a substantial amount of small-diameter, overstocked, and underutilized material.FPL research projects are exploring the potential of the small-diameter ... ..more »