A new wood-modification process based on in situ grafting of urethane groups: biological resistance and dimensional stability of carbamylated Scots pine wood

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60460709%3A41320%2F23%3A97091" target="_blank" >RIV/60460709:41320/23:97091 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1080/17480272.2023.2207541" target="_blank" >http://dx.doi.org/10.1080/17480272.2023.2207541</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1080/17480272.2023.2207541" target="_blank" >10.1080/17480272.2023.2207541</a>

Jazyk výsledku

angličtina

Název v původním jazyce

A new wood-modification process based on in situ grafting of urethane groups: biological resistance and dimensional stability of carbamylated Scots pine wood

Popis výsledku v původním jazyce

Chemical modification of wood typically requires the impregnation of wood with reactive compounds capable of undergoing covalent bonding to functional groups present in the cell wall. Creating such reactive agents in situ, with the use of low-priced chemicals, would prove more attractive for commercial applications. In this study, Scots pine (Pinus sylvestris L.) sapwood was impregnated with an aqueous solution of urea (30%), dried at 40 degrees C for 24 h, and subsequently heat treated in an oven at 150 degrees C for 24 h to produce the reactive isocyanic acid. By using accelerated fungal tests under laboratory conditions, provisional tests demonstrated a high biological resistance against selected moulds and rots. Migration of urea into the wood structure and grafting to its polymers during subsequent heat treatment, led to a bulked cell wall and enhanced resistance to water swelling, even after cycling water treatments. The bending strength (MOR) of modified pine wood was reduced by the treatment applied, while its modulus of elasticity (MOE) remained unchanged.

Název v anglickém jazyce

A new wood-modification process based on in situ grafting of urethane groups: biological resistance and dimensional stability of carbamylated Scots pine wood

Popis výsledku anglicky

Chemical modification of wood typically requires the impregnation of wood with reactive compounds capable of undergoing covalent bonding to functional groups present in the cell wall. Creating such reactive agents in situ, with the use of low-priced chemicals, would prove more attractive for commercial applications. In this study, Scots pine (Pinus sylvestris L.) sapwood was impregnated with an aqueous solution of urea (30%), dried at 40 degrees C for 24 h, and subsequently heat treated in an oven at 150 degrees C for 24 h to produce the reactive isocyanic acid. By using accelerated fungal tests under laboratory conditions, provisional tests demonstrated a high biological resistance against selected moulds and rots. Migration of urea into the wood structure and grafting to its polymers during subsequent heat treatment, led to a bulked cell wall and enhanced resistance to water swelling, even after cycling water treatments. The bending strength (MOR) of modified pine wood was reduced by the treatment applied, while its modulus of elasticity (MOE) remained unchanged.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20502 - Paper and wood

Projekt

—

Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2023

Kód důvěrnosti údajů

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

Název periodika

Wood Material Science and Engineering

ISSN

1748-0272

e-ISSN

1748-0272

Svazek periodika

18

Číslo periodika v rámci svazku

3

Stát vydavatele periodika

CZ - Česká republika

Počet stran výsledku

3

Strana od-do

1160-1162

Kód UT WoS článku

000991623500001

EID výsledku v databázi Scopus

2-s2.0-85159810327