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Study of wood surface pre-treatment by radio-frequency discharge plasma

Novák Igor, Sedliačik Ján, Krystofiak Tomasz, Lis Barbara, Popelka Anton, Kleinová Angela, Matyašovský Ján, Jurkovič Peter, Bekhta Pavlo

Drewno : prace naukowe, doniesienia, komunikaty

2019

vol. 62, nr 203

81--91

An investigation was made of wood of the species oak (Quercus petraea), beech (Fagus sylvatica L.), maple (Acer pseudoplatanus) and ash (Fraxinus excelsior) pre-treated using radio-frequency (RF) plasma in air at reduced pressure. Physical and chemical changes for all of the wood species were determined using measurements of water contact angles and FTIR-ATR spectroscopy. The results confirmed an increase in the wood’s hydrophilicity/polarity in all cases, caused by an increase in –OH group concentration due to irradiation by RF plasma. The content of oxygen-containing functional groups after treatment by RF plasma significantly increased, and the water contact angles were diminished. FTIR-ATR spectroscopy confirmed that RF plasma modification of the surfaces of all investigated wood samples led to certain changes, which were also dependent on the time of plasma exposure.

Influence of electromagnetic treatment of the mineral filler on properties of the adhesive compositions for plywood production

Anisimov Maxim, Belchinskaya Larisa, Sedliačik Ján

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

2014

No. 88

7--13

Influence of electromagnetic treatment of the mineral filler on properties of the adhesive compositions for plywood production. The influence of pre-activation of natural mineral filler zeolite (clinoptilolite) in the electromagnetic microwave field (EMF) and in a weak pulsed magnetic field (IMP) on the physical, mechanical and chemical properties of adhesive compositions were investigated. The differences in the mechanisms of exposure of EMF and IMP on mineral filler in adhesive composition were identified. Decrease of free formaldehyde content from cured adhesive composition is 23 %. Increase of acidity and reduction of gel time were determined. Addition of clinoptilolite into the adhesive composition increases the strength of the adhesive layer: at untreated sample by 6 %, treated in a weak IMP by 14 % and activated in EMF by 23 %.