Acidity of Wood

Subramanian, R. V.; Somasekharan, K. N.

doi:10.1515/hfsg.1983.37.3.117

Cited by 23 publications

(10 citation statements)

References 4 publications

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“…Holz als Roh-und Werkstoff 59 (2001) 2) Total acidity: Total acidity was estimated according to the procedure by Subramanian et al (1983). Reacting the wood with 0.1 M sodium acetate solution released an equivalent amount of acetic acid which resembles total acidity and it was expressed in meq.mol/100 g o.d.…”

Section: Originalarbeiten á Originalsmentioning

confidence: 99%

The correlation of wood acidity to its solubility by hot water and alkali

Balaban¹,

Uçar²

2001

Holz als Roh- und Werkstoff

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The hot water-and total acidity of some important hardand softwoods were correlated to hot water and 1% alkali solubilities. In this manner a positive correlation exists and in case of hardwoods a plot, an expected increasing curve, can be observed. However, due to an insuf®cient number of data the correlations of softwoods are somewhat ambiguous for low acidities and solubilities. Furthermore, the hot water solubility data ®t better than those of alkali solubility to both bound and total acidity. Korrelation der Holz-Acidita Èt mit der Ausbeute an Heiûwasser-und Alkali-ExtraktenDie Heiûwasser-und die Gesamt-Acidita Èt einiger wichtiger Laub-und Nadelho Èlzer wurde korreliert mit der Lo Èslich-keit in Heiûwasser und Alkali. Es existiert eine positive Korrelation. Im Fall der Laubho Èlzer liegt eine stetig ansteigende Kurve vor. Fu Èr geringe Lo Èslichkeiten und geringe Acidita Èt ist diese Korrelation allerdings aufgrund des geringen Datenmaterials recht schwach. Die Lo Èslich-keit in Heiûwasser ist in beiden Fa Èllen besser korreliert als die Alkali-Lo Èslichkeit, und zwar sowohl zur gebundenen Acidita Èt als auch zur Gesamt-Acidita Èt.

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Section: Originalarbeiten á Originalsmentioning

confidence: 99%

The correlation of wood acidity to its solubility by hot water and alkali

Balaban¹,

Uçar²

2001

Holz als Roh- und Werkstoff

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“…The pH reading was taken with two replications after 120 s at 20 • C under continuous stirring of the solution. Cold water extractives were prepared according to Subramanian et al [42]. In this method 25.0 ± 0.01 g of the wood flour (dried at 50 • C for 24 h) and 150 g distilled water were added to a 800-ml glass beaker at room temperature and the resulting suspension was thoroughly mixed.…”

Section: Woodmentioning

confidence: 99%

Catalytic influence of wood on the hardening behavior of formaldehyde-based resin adhesives used for wood-based panels

Stefke¹,

Dunky²

2006

Journal of Adhesion Science and Technology

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The aim of this work was to monitor the hardening behavior of two different ureaformaldehyde (UF) resins and to investigate the possible catalytic effect of cold water extractives of different wood species on the hardening characteristic. A pure UF resin and a melamine-modified UF resin were used for this investigation. For the experiments, ammonium chloride, ammonium sulphate, acetic acid and oxalic acid at different addition levels were used as hardeners. The gel times determined at three temperatures, the pH drop of the resins after the hardener addition, the buffering behavior and changes in the complex viscosity η * with time, as well as the development of the bond strength were chosen as parameters for characterizing the systems both with and without wood extractives. As expected, the buffering capacity of the melamine fortified resin was found to be much greater than for the pure UF resin. The gel times of the investigated resins were strongly dependent on the applied temperature, decreasing steeply at higher temperatures. Based on these data the apparent activation energies for various hardener additions have been calculated. The complex viscosity and the development of the internal bond strength indicated that cold water wood extractives had little or no effect on the curing progress of the resins.

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“…As a result, it is possible to find the most accurate amount of hardener so that the effects of the basic or acidic components of the wood are balanced. A commonly used methodology is based on the extraction of chips in boiling water and titration with acid solution or titration of the acetic acid liberated from the wood [9,10]. Most common protocols found in the literature are based on the titration of wood aqueous extracts to the end point at pH 3 [11,12] or pH 4 [13].…”

Section: Introductionmentioning

confidence: 99%

Comparison of Methodologies for Acid Buffering Capacity Determination—Empirical Verification of Models

2019

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Raw materials used in particleboard production may have different chemical properties as they have different origins, nature, and storage histories. One of the most important factors is the acidity of the wood which affects the process of bond line formation. Thus, determination of the acid buffering capacity (ABC) of a raw material helps to adjust the optimal amount of hardener in the adhesive. In the present study, three methods for pH-metric ABC determination in the presence of lignocellulosic material were compared. Models that correlate the hardener amount with the internal bonding of particleboards were built from the ABC results. The approach was tested on three materials of different acidity—pine, oak, and ammonia-treated oak. The developed models allowed the prediction of the optimal amount of hardener for the maximized internal bond of the boards. The experimental verification of the models showed a high convergence of the calculated and empirical results.

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Acidity of Wood

Cited by 23 publications

References 4 publications

The correlation of wood acidity to its solubility by hot water and alkali

The correlation of wood acidity to its solubility by hot water and alkali

Catalytic influence of wood on the hardening behavior of formaldehyde-based resin adhesives used for wood-based panels

Comparison of Methodologies for Acid Buffering Capacity Determination—Empirical Verification of Models

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