Wood Adhesives, Bond Durability, and Bonding Theory

A special issue of Forests (ISSN 1999-4907). This special issue belongs to the section "Wood Science and Forest Products".

Deadline for manuscript submissions: closed (10 August 2021) | Viewed by 4319

Special Issue Editor


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Guest Editor
Forest Biopolymer Science and Engineering and Head of Wood Adhesives, One Gifford Pinchot Drive, Madison, WI, USA
Interests: use of fundamental studies as applied to the performance of bonded wood products; emphasis on measuring properties of the bondline and after durability testing with moisture, heat including fire, force applied immediately or over time (creep); adhesive, coatings, and primer interactions with wood ; analysis techniques (mechanical, chemical, and microscopy) related to bonded wood performance; bio-based and synthetic adhesives; different wood species performance; unique bonded products, adhesives, or analysis methods; hypotheses
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Special Issue Information

Dear Colleagues,

Efficient use of our forest resources involves the use of improved adhesives, both renewable and non-renewable, to provide new bonded products at lower cost or with improved properties for use with laminated or binder adhesives. As uses of wood have moved from solid wood products to adhesively bonded products, this allows for greater use of wood in conventional and tall wood buildings. Products like cross laminated timber and mass plywood panels allow for taller buildings and greatly simplified construction processes. Accelerated tests are now used instead of end use tests to assess all forms of durability (creep, water, insect, biodegradation, heat, fire, etc.). All these along with normal strength tests and relationships of new products to older products that have demonstrated good performance are used in certification process. This leads to the need for a better understanding of bonded wood performance, especially in the bondline. This Special Issue will cover everything from load transfer from one wood piece to another through the adhesive to the interaction of the adhesive and wood at the nanoscale level. Papers can include reviews and recent unique research on bonded prospects from (a) mechanical, (b) chemical, (c) analytical, or (d) theoretical aspects.

Dr. Charles R. Frihart
Guest Editor

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Keywords

  • wood bonding
  • adhesives
  • synthetic
  • bio-based
  • strength
  • durability
  • analysis

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Published Papers (1 paper)

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Review

11 pages, 1109 KiB  
Review
A Comparison of Adhesion Behavior of Urea-Formaldehyde Resins with Melamine-Urea-Formaldehyde Resins in Bonding Wood
by Seongsu Park, Bora Jeong and Byung-Dae Park
Forests 2021, 12(8), 1037; https://doi.org/10.3390/f12081037 - 5 Aug 2021
Cited by 22 | Viewed by 3488
Abstract
This paper reports a comparison of adhesion behavior of urea-formaldehyde (UF) with those of melamine-urea-formaldehyde (MU) resins in bonding wood by analyzing the results published in literatures. For this purpose, the adhesion behavior of UF resins prepared by blending low-viscosity resin (LVR) with [...] Read more.
This paper reports a comparison of adhesion behavior of urea-formaldehyde (UF) with those of melamine-urea-formaldehyde (MU) resins in bonding wood by analyzing the results published in literatures. For this purpose, the adhesion behavior of UF resins prepared by blending low-viscosity resin (LVR) with high-viscosity resin (HVR) at five different blending and two formaldehyde/urea (F/U) molar ratios (1.0 and 1.2) was compared with those of two MUF resins synthesized by either simultaneous reaction (MUF-A resins) or multi-step reaction (MUF-B resins) with three melamine contents (5, 10, and 20 wt%). As the blending (LVR:HVR) ratio increased from 100:0 to 0:100, the viscosity and molar mass (Mw and Mn) of the blended UF resins increased while the gelation time decreased. The interphase features such as maximum storage modulus (E′max), resin penetration depth, and bond-line thickness of the UF resins increased to a maximum and then decreased as the blending ratio increased. In addition, both MUF-A and MUF-B resins also showed an increase in the Mw and Mn as the melamine content increased from 5% to 20%. However, the E′max, resin penetration depth, and bond-line thickness of the MUF resins decreased as the molar mass or melamine content increased. These results indicated that the adhesion of UF resins heavily depends on the interphase features while that of the MUF resins highly depends on the cohesion of the resins. Full article
(This article belongs to the Special Issue Wood Adhesives, Bond Durability, and Bonding Theory)
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