Wyniki wyszukiwania - BazTech

Ograniczanie wyników

Znaleziono wyników: 2

Liczba wyników na stronie

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: liquefied wood

Sortuj według:

Ogranicz wyniki do:

Evaluation of the influence of selected liquefaction factors on the spectral parameters of liquefied wood

Bielejewska N., Janiszewska D.

Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology

2018

No. 104

492--495

This work focuses on spectroscopic characterization of lignin extracted from wood liquefaction residues. The aim of the research was to evaluatethe influence of the amount of the solventand the raw material typeused for liquefaction on the spectral parameters of the lignin isolated from liquefaction residues.Different types of biomass assortments were liquefied according to the previously described procedures.The amount of the propylene glycol used as the liquefying agent has been modified. The lignin isolated from the residues after wood liquefaction process has been subjected to spectroscopic studies. Absorption spectra were obtained using a double-beam spectrophotometer. As a reference the lignin extracted from standard untreated samples was used. Based on the research it has been concluded thatthe amount of the solvent and the raw material type do not have significant influence on the spectral properties of liquefied wood products.

Application of selected agents for wood liquefaction and some properties of particleboards produced with the use of liquefied wood

Janiszewska D., Frąckowiak I., Bielejewska N.

Drewno : prace naukowe, doniesienia, komunikaty

2016

vol. 59, nr 197

223--230

This work presents the characteristics of wood liquefied using different types of solvents in terms of its application for binding particleboards. Standard pine particles from barked wood were used for the liquefaction experiments. The liquefaction reaction was carried out in high temperature conditions using a mixture of solvents from the polyhydroxy alcohol group, including glycerine, ethylene glycol, propylene glycol, diethylene glycol, and dipropylene glycol. The microstructure of both the liquefied wood and the liquefaction residues was determined by means of optical microscopy analysis. The basic parameters of the adhesive mixture modified with the liquefied wood, such as viscosity, pH and gel time were determined. Particleboards containing liquefied wood were produced. The following physicochemical and mechanical properties of the particleboards were measured: tensile strength, bending strength, modulus of elasticity, and formaldehyde content. The influence of the liquefying agent on the board properties was investigated. In all the tests, a control particleboard, bonded with a urea-formaldehyde adhesive resin with no inclusion of liquefied wood, was used for the purposes of comparison.