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Forest Products Laboratory
One Gifford Pinchot Drive
Madison, WI 53726-2398
Phone: (608) 231-9200
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Title: Small-angle neutron scattering as a new tool to evaluate moisture-induced swelling in the nanostructure of chemically modified wood cell walls

Source: Forest Products Journal. 68(4): 349-352.

Author(s)Plaza, Nayomi Z.; Jakes, Joseph E.; Frihart, Charles R.; Hunt, Christopher G.; Yelle, Daniel J.; Lorenz, Linda F.; Heller, William T.; Pingali, Sai Venkatesh; Stone, Donald S.

Publication Year: 2017  View PDF »

Category: Journal Articles
Associated Research Project(s):   FPL-4707-2B

Abstract: Wood-based products can be a sustainable and more environmentally friendly alternative to traditional construction materials because of their reduced contribution to air and water pollution. An integral component of these products is often an adhesive. Because wood is hygroscopic, moisture-induced swelling in the cell walls near the wood–adhesive bond lines can lead to durability and performance issues. Unfortunately, researchers working toward improving the moisture durability of forest products are hindered by an incomplete understanding of the nanoscale mechanisms that contribute to moisture-induced swelling in wood and how chemical modifications affect the swelling. Therefore, we developed small-angle neutron scattering (SANS) into a tool that can study the 1-to 100-nm structure of unmodified and chemically modified wood cell walls and can measure the effects of moisture in this structure. In this study, SANS was used to reveal the nanostructure of a deuterium-labeled phenol-formaldehyde (dPF) adhesive infiltrated into wood cell walls. The results revealed that the dPF infiltrated the water-accessible regions between the elementary fibrils inside the wood cell walls. These results provide the new insight that adhesive infiltration into the cellulose microfibril (a bundle of elementary fibrils) may be a key to designing moisture-durable wood adhesives.

Keywords: Wood adhesive; neutron scattering; infiltration

Publication Review Process: Formally Refereed

File size: 209 kb(s)

Date posted: 10/02/2019

This publication is also viewable on Treesearch:  view
RITS Product ID: 96464
Current FPL Scientists associated with this product (listed alphabetically)
Frihart, Charles R.
Research Chemist
Hunt, Christopher G.
Research Chemist
Jakes, Joseph
Research Materials Engineer
Plaza Rodriguez, Nayomi
Research Materials Engineer
Yelle, Daniel
Research Forest Products Technologist

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- FPL's Mission and Strategic Plan -

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- FPL Research Emphasis Areas -
Advanced Composites

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Advanced Structures

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Forest Biorefinery

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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 »