Estimation of the Surface Energy and Acid-Base Properties of Wood by Means of Wetting Method

Abstract

Pine wood (Thtux xllwsttis L.) Cuntuet angle technique (CAT) Sessile drop method (SDM) Wilhelmy plate method (WPM) Surface energy Lifshit/,-vun der Waals (LW) energy component Acid-base (AB) energy component Acidity and basicity parameters Advancing and receding contact angle Contact angle hysteresis (CAM) Surface roughness (SR) SummaryThe important surface energy and acid-base properties for pine wood (7V////,v xllwxtrix /") have been estimated by using two contact angle techniques (CAT)« e.g., the sessile drop method and the Wilhelmy plate method, respectively. According to (he results, the pine wood may he characteri/ed as a low surface energy polymer due to its low surface energy, The surface energy, γ,, for the pine wood was being larger in the direction parallel to the grains as compared with the perpendicular direction, The Lifshit/-vnn der Waals (LW) energy component, γ Ν ΙΛν , is the major energy component for the pine wood as compared with the acid-base energy component, γ/ νϋ . Furthermore, it seems that the LW energy component, y" l ' w , of pine wood is independent of the choice of wetting methods and of the chemical composition of the surface. However, the surface acid-base (AR) energy component, Y" AU , for the pine wood seems to be dependent on the wetting methods chosen. Subdivided into its contributions, the surface of pine wood seems to be weaker in the acidic energy parameter, γ, 1 , and stronger in the basic energy parameter, γ,. Rough estimation of the contact angle hysteresis (CAM) and surface roughness (SR) has also been measured separately in the parallel direction and the perpendicular directions, respectively.

Investigating interphase development in woodpolymer composites by inverse gas chromatography

“…The results are summarized in Table 2. The dispersive surface energy of the uncoated wood substrate (after exposure to the same conditions used in composite preparation) was determined as 32.8 mJ/m2, in good agreement with the literature values [ 11,19). Generally, the variation in this parameter with polymer content is relatively small for the polymer types investigated.…”

Preparation and Characterization of Outdoor Bamboo-Fiber-Reinforced Composites with Different Densities

“…The γ S values of the pristine OBFRC samples ranged from 30 mJ/m 2 and 44 mJ/m 2 , which were slightly lower than that of wood (Wang et al 2015). As pine wood (Pinus sylvestris L.) (Shen et al 1998), γ S LW was the major energy component for OBFRC as compared with γ S AB . Furthermore, it seemed that γ s , γ s LW and γ s AB for the pristine samples depended on the density of OBFRC.…”

Surface Wettability of Wood Species from Tropical and Temperate Zones by Polar and Dispersive Liquids

“…The dispersive component was the dominant component of the surface free energy. This is a typical feature characteristic for polymers of which the wood is composed (Mohan et al, 2011;Shen et al, 1998). According to Li et al (2014), the high value of the dispersive component is the result of high interaction ability of the dispersive part of available carbon-oxygen and carbon-carbon bonds within the wood.…”