Spremljanje utrjevanja utekočinjenega lesa in lepljenja lesa z utekočinjenim lesom
2015
Liquefied wood is a potential alternative to the synthetic
adhesives which are used for the bonding of wood.
Despite the ability of liquefied wood to self-crosslink,
bonds formed during the bonding of wood with liquefied
wood do not achieve sufficient shear strength
and have poor resistance to water. For this reason the
process of the curing of liquefied wood, the influence
of various parameters on the shear strength of bonds,
and the structure of bonds formed during the bonding
were analyzed. It was found that the chemical curing
of liquefied wood started after water and solvent had
been removed from it. When bonding wood, the curing
of liquefied wood takes place faster because, in
addition to evaporation, the transition of both vaporous
components from the liquefied wood to the lamellas
also occurs. During the bonding of 5 mm thick
beech lamellas with liquefied wood having a negative
pH, at optimal bonding conditions (180 °C, 12 min),
a specific type of bond was formed. It consisted of a
central part of carbonized wood cells of the bonded
lamellas and the cured liquefied wood, and a narrow
layer of partly delignified wood cells at the border between
the central part and bonded lamella.
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