Abstract
Scots pine (Pinus sylvestris L.) is a widely-used wood species in construction and exterior applications. However, inherently low liquid permeability of wood presents substantial challenges to processing efficiency. In order to improve the liquid permeability in Scots pine, the effect of two different surfactants including dodecyl dimethyl ammonium chloride (DDAC) and primary alcobol ethoxylate (JFC-U) were investigated in this study. The mechanism was unveiled by microscopic observation, chemical analysis of extractive composition, and molecular dynamics (MD) simulations. The results demonstrated that both surfactants increased the liquid absorption in Scots pine by 14.7–46.3 % within 0.5 h. This effect was mainly attributed to the surfactants' capability to enhance surface wetting and dissolve extractives deposited on pit membrane in Scots pine wood. DDAC outperformed JFC-U in dissolving extractives. The MD simulations between DDAC and stearic acid (a representative extractive) illustrated that DDAC could envelope stearic acid molecules and form micellar structures through the strong intermolecular forces between them. These findings provide valuable insights into the effect and mechanisms by which surfactants enhance liquid permeability in extractive-rich wood, therefore, to support the development of efficient wood treatment technologies.
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