The study of selected properties of black poplar wood (Populus nigra L.) subjected to furfurylation and polymerization in lumen

2020 ◽  
Vol 112 ◽  
pp. 11-21
Author(s):  
Tomasz Gliszczyński ◽  
Andrzej Antczak
Keyword(s):  
Maleic Anhydride ◽  
Furfuryl Alcohol ◽  
Brinell Hardness ◽  
Colour Change ◽  
Populus Nigra ◽  
Poplar Wood ◽  
Test Results ◽  
Black Poplar ◽  
Volume Swelling ◽  
Water Absorbability

The study of selected properties of black poplar wood (Populus nigra L.) subjected to furfurylation and polymerization in lumen. The aim of this work was studying black poplar wood (Populus nigra L.) selected properties modified with furfuryl alcohol and styrene. Maleic anhydride and glicydyl methacrylate were used as cross-linking agents. For modified wood samples the index of WPG, density, hardness, water absorbability, colour change and volume swelling were tested. Each test results were compared with values for unmodified black poplar wood. During furfurylation process density of poplar wood samples increased up to 1.3 times. Addition of maleic anhydride to furfurylation process caused increase of WPG index about 5-6 % and at the same time slightly decrease of wood Brinell hardness. Water absorbability and volume swelling of furfurylated poplar wood after 10080 min (168 h) of soaking in water were reduced more than 50% relative to unmodified wood. Polymerization in lumen with using styrene caused increase of density up to 2 times, increase of Brinell hardness up to 1.5 times, while WPG index was in the range from 50.8 to 116.6%. For polymerization in lumen process, water absorbability and volume swelling after 10080 min (168 h) of soaking in water were reduced more than half as well. Furfurylation caused intensive wood darkening when polymerization in lumen changed wood colour slightly. Addition of maleic anhydride to furfuryl alcohol caused an even greater darkening of the wood. The studies proved, that chemical modification significantly improved selected properties of poplar wood.

Swelling and water resistance of black poplar wood (Populus nigra L.) modified by polymerisation in lumen with styrene

2020 ◽  
Vol 110 ◽  
pp. 35-40
Author(s):  
Emil Żmuda ◽  
Andrzej Radomski
Keyword(s):  
Water Absorption ◽  
Water Resistance ◽  
Wood Properties ◽  
Populus Nigra ◽  
Poplar Wood ◽  
Black Poplar ◽  
Initial Stage ◽  
Volume Swelling ◽  
Water Absorbability ◽  
Modified Wood

Swelling and water resistance of black poplar wood (Populus nigra L.) modified by polymerisation in lumen with styrene. Polymerisation in lumen of black poplar (Populus nigra L.) was performed to improve wood properties related to interaction with water. Wood samples were modified with styrene or a mixture of styrene and maleic anhydride, using benzoyl peroxide as initiator. Polymerisation was conducted in closed vessels at a temperature up to 120 °C. Volume swelling and water absorbability of modified wood samples were measured. A significant decrease in the rate of water absorption was found, especially at the initial stage of soaking, resulting in 50 % decrease in volume swelling and 85 % decrease in water absorption.

The study of the impact of in situ polymerisation with styrene or acrylates on water absorbability and swelling of thermomechanically densified poplar wood

2019 ◽  
Vol 108 ◽  
pp. 140-147
Author(s):  
ANDRZEJ RADOMSKI ◽  
MARTA GNACIŃSKA
Keyword(s):  
Nitrogen Atmosphere ◽  
Densified Wood ◽  
Poplar Wood ◽  
Dominant Effect ◽  
Thermally Induced ◽  
Volume Swelling ◽  
Water Absorbability ◽  
The Impact ◽  
Thermally Treated

The study of the impact of in situ polymerisation with styrene or acrylates on water absorbability and swelling of thermomechanically densified poplar wood. Black poplar samples, which were previously subjected to thermomechanical densification, were tested for an improvement on the field of water resistance. Series of samples were additionally thermally treated in a nitrogen atmosphere, and then series of densified only or densified and thermally treated samples were treated with monomer mixtures, containing styrene or acrylates, and co-monomers reactive toward cell wall of wood, followed by thermally induced radical polymerisation. All samples were tested by prolonged soaking in water, while volume swelling and absorbability were determined. Densified wood proved to be suitable for modification by in situ polymerisation. Thermally treated densified wood was found to be significantly more compatible with polymers used, as a decrease in its swelling was observed as dominant effect, while absorbability changes were less clear.

scholarly journals Effects of Thermo-Vibro-Mechanic® densification on the density and swelling of pre-treated Uludağ fir and black poplar wood

BioResources ◽  
2021 ◽  
Vol 16 (1) ◽  
pp. 1581-1599
Author(s):  
Mehmet Budakçı ◽  
Süleyman Şenol ◽  
Mustafa Korkmaz
Keyword(s):  
Compression Ratio ◽  
Tangential Direction ◽  
Populus Nigra ◽  
Low Density ◽  
Poplar Wood ◽  
Application Time ◽  
Black Poplar ◽  
Different Temperatures ◽  
Tangential Directions ◽  
Control Samples

The radial and tangential swelling as well as the fully dried density of low-density wood materials densified via the Thermo-Vibro-Mechanic® method were evaluated in response to applying wood stain and preservative. The samples obtained from Uludağ fir (Abies bornmüelleriana Mattf.) and black poplar (Populus nigra L.) in the radial and tangential direction were pre-treated with wood stain and preservative before undergoing Thermo-Vibro-Mechanic® densification. Thermo-Vibro-Mechanic® densification was performed at three different temperatures (100 °C ± 3 °C, 120 °C ± 3 °C, and 140 °C ± 3 °C), three different vibration pressures (0.60 MPa, 1.00 MPa, and 1.40 MPa), and three different vibration times (20 s, 60 s, and 100 s). Afterwards, changes in the fully dried density and swelling amounts in the radial and tangential directions of the samples were determined. The fully dried density increased by 15.4% to 38% and the radial and tangential swelling amounts increased by 73.2% to 242.6%, when the densified samples were compared to the control samples. In general, the fully dried density and swelling values increased depending on the Thermo-Vibro-Mechanic® densification parameters; higher values were found as the compression ratio and total application time increased.

Structure of genetic diversity in marginal populations of black poplar (Populus nigra L.)

2015 ◽  
Vol 61 ◽  
pp. 297-302 ◽  
Author(s):  
Dechun Jiang ◽  
Guili Wu ◽  
Kangshan Mao ◽  
Jianju Feng
Keyword(s):  
Genetic Diversity ◽  
Populus Nigra ◽  
Marginal Populations ◽  
Black Poplar

ANTIMICROBIAL ACTIVITY OF BLACK POPLAR (POPULUS NIGRA L.) BUD AND SPROUT TINCTURES

2019 ◽  
Vol 68 (3) ◽  
Author(s):  
E.A. Kupriyanova ◽  
V.A. Kurkin ◽  
V.M. Ryzhov ◽  
A.V. Lyamin ◽  
O.V. Kondratenko ◽  
...  
Keyword(s):  
Antimicrobial Activity ◽  
Populus Nigra ◽  
Black Poplar

Dynamic moisture sorption and dimensional stability of furfurylated wood with low lignin content

Holzforschung ◽  
2019 ◽  
Vol 74 (1) ◽  
pp. 68-76
Author(s):  
Tiantian Yang ◽  
Erni Ma ◽  
Jinzhen Cao
Keyword(s):  
Relative Humidity ◽  
Dimensional Stability ◽  
Furfuryl Alcohol ◽  
Lignin Content ◽  
Moisture Sorption ◽  
Dimensional Change ◽  
Poplar Wood ◽  
Sorption Coefficient ◽  
Dimensional Changes ◽  
Sinusoidal Shape

AbstractDegradation of lignin occurs naturally in wood due to the influence of microorganisms or photic radiation. To improve the properties of wood with low lignin content, furfuryl alcohol (FA) at the concentration of 25% was used to modify poplar wood (Populus euramericana Cv.) after partial delignification. Moisture sorption and dimensional stability of the samples were investigated under dynamic conditions where the relative humidity (RH) was changed sinusoidally between 45% and 75% at 25°C. Both the moisture content (MC) and the tangential dimensional change varied with a sinusoidal shape similar to the RH. Hygroscopicity and hygroexpansion increased after delignification, while furfurylation led to an inverse impact by reducing MC, dimensional changes, amplitudes of MC and dimensional changes, moisture sorption coefficient (MSC), and humidity expansion coefficient (HEC). After delignification and further furfurylation, the MC and the dimensional changes were reduced by about 20%, and the maximum drop in amplitudes of MC and dimensional changes was about 30%, while the MSC and the HEC decreased by over 15%. In addition, the furfurylated wood with low lignin content exhibited lower sorption hysteresis and swelling hysteresis.

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