Solute diffusion into cell walls in solution-impregnated wood under conditioning process IV: effect of temperature on solute diffusivity

The impregnation of poplar wood (Populus adenopoda Maxim) with 1,3-dimethylol-4,5-dihydroxyethyleneurea and maltodextrin and the effects of ZnCl2 and curing at 103 °C and 120 °C on the fixation rate and the leaching resistance of modified samples were investigated (103 °C curing, ZnCl2 + 103 °C curing, 120 °C curing, and ZnCl2 + 120 °C curing are denoted as 103, ZC-103, 120, and ZC-120, respectively), with the aim of improving the modification effect. The results showed that ZC-103 had the highest fixation rate, and its weight leaching ratio was higher than that of 120. Fourier-transform infrared spectroscopy showed that ZnCl2 did not affect the functional groups of the modified chemicals. The flexural strength and modulus and the compressive strength perpendicular to the grain were highest for ZC-103. In summary, ZC-103 exhibited the highest fixation rate, indicating that the hardener ZnCl2 bridged and increased the interfacial properties between the chemicals and cell walls and therefore increased the potential for macromolecule polycondensation between the chemicals and cell wall materials. This research paves the way for improving the fixation rate of impregnated wood and provides new insights into practical applications.

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Influence on Wood Color of Relative Humidity in Conditioning Process of Dye-Aqueous Solution Impregnated Wood

Journal of the Society of Materials Science Japan ◽

10.2472/jsms.67.767 ◽

2018 ◽

Vol 67 (8) ◽

pp. 767-772

Author(s):

Soichi TANAKA ◽

Hideaki SUGINO ◽

Masako SEKI ◽

Tsunehisa MIKI ◽

Kenji UMEMURA ◽

...

Keyword(s):

Aqueous Solution ◽

Relative Humidity ◽

Wood Color ◽

Conditioning Process ◽

Impregnated Wood

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Effect of Temperature on Guaiacol Peroxidase of Pyrus communis

International Letters of Natural Sciences ◽

10.18052/www.scipress.com/ilns.5.46 ◽

2013 ◽

Vol 5 ◽

pp. 46-51 ◽

Cited By ~ 2

Author(s):

Shahriar Saeidian ◽

Elham Ghasemifar

Keyword(s):

Peroxidase Activity ◽

Cell Walls ◽

Indoleacetic Acid ◽

Maximum Activity ◽

Effect Of Temperature ◽

Guaiacol Peroxidase ◽

Pathogenic Microorganisms ◽

Ph Optimum ◽

Auxin Level ◽

Auxin Catabolism

Peroxidase (EC 1.11.1.7; donor: hydrogen-peroxide oxidoreductase, POD) is one of the key enzymes controlling plant growth, differentiation and development. The enzyme participates in construction, rigidification and eventual lignification of cell walls, biosynthesis of ethylene from 1-aminocyclopropane-1-carboxylic acid and H2O2, regulation of auxin level through auxin catabolism, protection of tissue from damage and infection by pathogenic microorganisms, the oxidation of indoleacetic acid. For peroxidase activity in wild pears extract one pH optimum was observed at 6.5 that probably belong to atleast one isoenzyme. Activity of peroxidase in presence of guaiacol and H2O2 was optimum after incubation at 40 °C. Maximum activity of peroxidase is 300% .Activity increased to 240%, 300%, 70% and 10% after 60 minute incubation at 30, 40, 45 and 60 °C for peroxidase. Incubation at high temperature (70 °C) was accompanied with decrease of activity to 10% peroxidase activity.

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Investigation on wax-impregnated wood. Part 1: Microscopic observations and 2D X-ray imaging of distinct wax types

Holzforschung ◽

10.1515/hf.2010.091 ◽

2010 ◽

Vol 64 (5) ◽

Cited By ~ 9

Author(s):

Gunthard Scholz ◽

Jan Van den Bulcke ◽

Matthieu Boone ◽

Mario Zauer ◽

Ernst Bäucker ◽

...

Keyword(s):

Cell Walls ◽

Treated Wood ◽

Wax Deposition ◽

X Ray ◽

X Ray Imaging ◽

Wax Deposits ◽

Wood Part ◽

Epithelium Cells ◽

Impregnated Wood ◽

Parenchyma Tissue

Abstract The migration and deposition of hot melting wax in wax-treated wood is not described in detail in the literature, although such products are available on the market. In the present study, this topic was investigated based on pine sapwood (Pinus sylvestris L.) and beech (Fagus sylvatica L.). The behavior of three different waxes was studied by means of 2D X-ray measurements and scanning electron microscopy observations. The three waxes did not show distinct differences in their deposition patterns. An intensive wax deposition could be observed within the vessels, tracheids, and fibers. In P. sylvestris the ray tracheids were penetrated with hot melting waxes, therefore there is a lateral wood penetration from the outer to the inner wood. In general, no wax penetration was visible within the parenchyma tissue and epithelium cells. Cracks were detected within the wax deposits as well as secondary microcapillaries, which were visible between the deposits and the cell walls.

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