Particleboards from Acetylated Wood Flakes

Wagner, Daniel; Schwarzinger, Clemens; Leidl, Manuela; Schmidt, Harald; Endesfelder, Andreas

doi:10.1007/s00706-007-0607-4

Cited by 8 publications

(3 citation statements)

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“…As known from previous studies, the side effect of acetylation is a decrease in the mechanical properties of particleboards (Wagner et al, 2007, Abdolzadeh et al, 2011, which are mainly caused by low bondability due to low wettability, the loss of a substantial amount of wood per unit mass and deterioration of fi bers by acetylation (Korai, 2001). There is an adhesion problem between the hydrophilic water soluble melamine urea formaldehyde (MUF) resin and the hydrophobic acetylated fl akes (Wagner et al, 2007).…”

Section: Uvodmentioning

confidence: 87%

“…There is an adhesion problem between the hydrophilic water soluble melamine urea formaldehyde (MUF) resin and the hydrophobic acetylated fl akes (Wagner et al, 2007). This problem was solved by several methods such as the application of non polar resin with better adhesion to hydrophobic acetylated fl akes (Wagner et al, 2007), improvement of the wettability of acetylated fl akes by addition of emulsifi ers to the phenolic resin (Youngquist et al, 1988), and the increase of panel density (Hague et al, 1999).…”

Section: Uvodmentioning

confidence: 99%

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Effect of Press Cycle Time on Application Behavior of Board Made from Chemically Modified Particles

Ghorbani

Bavaneghi

2016

Drvna ind.

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Utjecaj trajanja ciklusa prešanja na ponašanje u primjeni ploče izrađene od kemijski modificiranih čestica Received -prispjelo: 12. 12. 2014. Accepted -prihvaćeno: 29. 1. 2016. UDK: 630*863.215 doi:10.5552/drind.2016 mechanical behavior was investigated as well as the decay resistance of acetylated particleboards. Original scientifi c paper • Izvorni znanstveni rad MATERIALS AND METHODS MATERIJALI I METODE Acetylation AcetilacijaFlakes were prepared by using a laboratory ring fl aker (Pallmam pz8) from maple wood (Acer insigne). They were dried in the oven for 24h at 103±2 °C. After 12h soaking in the acetic anhydride, the fl akes were heated at 120 °C for 40 and 180 minutes to achieve 9 and 16 % weight gains, respectively, (based on pre-test results). Modifi ed fl akes were washed with distilled water to remove acetic acid as the reaction by-product and unreacted acetic anhydride. Acetylated particles were dried in the oven at 103±2 °C for 24 h. Weight percent gain (WPG) was calculated using the equation (1). (1) Where WPG indicates the weight percent gain (%), W act and W unt are oven dry weights after and before the acetylation (g), respectively. OH group's substitution was determined according to equation (2) mentioned in the paper of Li et al. (2011). (2) Where OH substd indicates substitution of OH with acetyl groups (mmol/g), W act and W unt are oven dry weights after and before the acetylation (g), respectively. M w is the molecular weight of the adduct acetyl (-C (O)-CH 3 ) group (g/mmol). FTIR analysis 2.2. FTIR analizaThe Fourier transform infrared (FTIR) spectra were measured by using a Bio-rad spectrometer FTS-40 incorporating a Spectra Tech diffuse refl ectance accessory unit. For FTIR analysis, dried acetylated fl akes were milled and passed through a 40 mesh sieve. Spectra were obtained directly from wood powder on a detector prism. Manufacture of boards 2.3. Proizvodnja pločaParticles with size of 20-40 mesh were used for making the particleboards. After being blended with melamine urea formaldehyde (MUF) resin (10 % based on the oven dry weight), the single layer mats were pre-

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Section: Uvodmentioning

confidence: 87%

Section: Uvodmentioning

confidence: 99%

Effect of Press Cycle Time on Application Behavior of Board Made from Chemically Modified Particles

Ghorbani

Bavaneghi

2016

Drvna ind.

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“…By reaction with acetic anhydride or isopropenyl acetate the hydroxyl groups of wood are transformed into acetic esters, which render wood more hydrophobic. The improved weathering stability of acetylated wood has been demonstrated not only for solid wood, but also for wood polymer composites and fiber boards [5].…”

Section: Introductionmentioning

confidence: 99%

Identification of marker compounds in pyrolysis–GC/MS of various acetylated wood types

Schwarzinger

List

2010

Journal of Analytical and Applied Pyrolysis

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Synthesis and Characterization of Allylmelamine Based Polymers

Gabriel

List

Schwarzinger

2012

Macromolecular Symposia

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Novel linear polymers on the basis of allyl functionalized melamine derivatives, without using formaldehyde as cross‐linking agent, were created. Allylpentamethylmelamine and allyltetramethylmelamine were polymerized by free radical mechanism in substance. Allylpentamethyl‐melamine was also copolymerized with styrene by anionic polymerization. The new polymers offer a broad range of industrial application for melamine derivatives, not only in homopolymerization but also in the copolymerization with other monomers. For molar mass determination the polymer has been separated in different fractions by SEC and characterized by SEC and MALDI‐ToF mass spectrometry.

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Particleboards from Acetylated Wood Flakes

Cited by 8 publications

References 1 publication

Effect of Press Cycle Time on Application Behavior of Board Made from Chemically Modified Particles

Effect of Press Cycle Time on Application Behavior of Board Made from Chemically Modified Particles

Identification of marker compounds in pyrolysis–GC/MS of various acetylated wood types

Synthesis and Characterization of Allylmelamine Based Polymers

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