Study of Penetration Kinetics of Sodium Hydroxide Aqueous Solution into Wood Samples

Lubomír Lapčík, Lubomír Lapčík, Petr Kubíček, Barbora Lapčíková, Radek Zbořil, Tatiana Nevěčná

Abstract


The kinetics of unidirectional penetration of NaOH aqueous solution into rectangular samples of wood oriented parallel to a stern axis were studied. Scots pine (Pinus sylvestris), European larch (Larix decidua), blackthorn (Prunus spinosa), white willow (Salix alba), and horse-chestnut wood (Aesculus hippocastanum) were studied in this work. The time dependence of liquid incorporation was measured by the volumetric method as a change of total volume of coexisting liquid (NaOH/H2O) phase. The total thickness of the swollen surface layer d and mean value of the apparent diffusion coefficient of aqueous NaOH solution at 22 °C were determined.

Keywords


Incorporation; Diffusion; Liquid transport; Wood; Swelling; Alkali treatment

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