Bending properties of hardwood-based layered wood composites bonded with polyurethane adhesive modified by thermosets

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60460709%3A41320%2F25%3A102237" target="_blank" >RIV/60460709:41320/25:102237 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/61989100:27730/25:10256275

Výsledek na webu

<a href="https://doi.org/10.1016/j.conbuildmat.2024.139831" target="_blank" >https://doi.org/10.1016/j.conbuildmat.2024.139831</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.conbuildmat.2024.139831" target="_blank" >10.1016/j.conbuildmat.2024.139831</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Bending properties of hardwood-based layered wood composites bonded with polyurethane adhesive modified by thermosets

Popis výsledku v původním jazyce

One of the effects of climatic change is a reduction in the availability of traditional wood resources, especially softwood. As a result, hardwood-based layered composites and their ever-increasing use drive the interest in hardwood bonding. However, forming such composites presents several challenges that require modifying adhesive systems. The work presented deals with the modification of a polyurethane (PUR) adhesive to the composition of laminates based on European beech (Fagus sylvatica L.), Common oak (Quercus robur L.), and Black locust (Robinia pseudoacacia L.) wood. The modified adhesive system consists of a PUR adhesive and acrylate water-dilutable penetration based on methacrylic acid esters in the cured state with the addition of thermoset particles. The modified adhesive system was tested under static and dynamic bending at different moisture contents of the test samples. Analyses of the mechanical behavior of materials bonded with modified PUR adhesive systems and the chemistry of the bonded part revealed a mix of advantages and disadvantages of this bonding system for certain hardwoods. For black locusts, in particular, the advantages seem to prevail, for which the MOR at 12 % moisture content averaged 160 MPa, and at increased moisture content, it averaged 147 MPa. And the average IBS for black locust wood was 17 J/cm2 for both moisture content levels. In general, the MOR, MOE, IBS, and delamination were improved by the modified adhesive system.

Název v anglickém jazyce

Bending properties of hardwood-based layered wood composites bonded with polyurethane adhesive modified by thermosets

Popis výsledku anglicky

One of the effects of climatic change is a reduction in the availability of traditional wood resources, especially softwood. As a result, hardwood-based layered composites and their ever-increasing use drive the interest in hardwood bonding. However, forming such composites presents several challenges that require modifying adhesive systems. The work presented deals with the modification of a polyurethane (PUR) adhesive to the composition of laminates based on European beech (Fagus sylvatica L.), Common oak (Quercus robur L.), and Black locust (Robinia pseudoacacia L.) wood. The modified adhesive system consists of a PUR adhesive and acrylate water-dilutable penetration based on methacrylic acid esters in the cured state with the addition of thermoset particles. The modified adhesive system was tested under static and dynamic bending at different moisture contents of the test samples. Analyses of the mechanical behavior of materials bonded with modified PUR adhesive systems and the chemistry of the bonded part revealed a mix of advantages and disadvantages of this bonding system for certain hardwoods. For black locusts, in particular, the advantages seem to prevail, for which the MOR at 12 % moisture content averaged 160 MPa, and at increased moisture content, it averaged 147 MPa. And the average IBS for black locust wood was 17 J/cm2 for both moisture content levels. In general, the MOR, MOE, IBS, and delamination were improved by the modified adhesive system.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20502 - Paper and wood

Projekt

<a href="/cs/project/EF16_019%2F0000803" target="_blank" >EF16_019/0000803: Excelentní Výzkum jako podpora Adaptace lesnictví a dřevařství na globální změnu a 4. průmyslovou revoluci</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2025

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

CONSTRUCTION AND BUILDING MATERIALS

ISSN

0950-0618

e-ISSN

0950-0618

Svazek periodika

460

Číslo periodika v rámci svazku

JAN 24 2025

Stát vydavatele periodika

CZ - Česká republika

Počet stran výsledku

15

Strana od-do

1-15

Kód UT WoS článku

001412575900001

EID výsledku v databázi Scopus

2-s2.0-85214305444