Effect of surface conditions related to machining and air exposure on wettability of different Mediterranean wood species

Santoni, Ilaria; Pizzo, Benedetto

doi:10.1016/j.ijadhadh.2011.07.002

Cited by 44 publications

(30 citation statements)

References 19 publications

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“…The high contact angles of rotary wood may be caused by the different preparation technology of rotary wood samples; the extractives may have migrated from the interior to the exterior surface during the cooking and drying process. It is known that wood contains various extractives (Santoni and Pizzo 2011), such as terpenes, resins, phenolic compounds, triglycerides, fatty acids, and so on, and most of these are relatively hydrophobic. The frictional heat generated by rotary machining can be expected to cause these materials to migrate to the surface and smear over the surface of the wood, and a hydrophobic wood surface can be caused.…”

Section: Contact Anglementioning

confidence: 99%

Surface Free Energy and Dynamic Wettability of Differently Machined Poplar Woods

Qin¹,

Gao²,

Zhang³

et al. 2014

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The surface free energy and dynamic wettability of wood are important to the performance of its adhesive bonding strength. In this work, the surface free energy of poplar wood samples machined with different processes were calculated by the OWRK (geometric mean) and vOCG (acid-base) methods, and the dynamic wettability of adhesives on wood samples was studied using the S-D wetting model. The results indicate that the contact angles of reference liquids on rotary wood samples were greater than those on planed or sawn wood, and the rotary wood samples were more hydrophobic. The effect of surface roughness on contact angle was insignificant compared with surface structure morphology. The total surface free energy was almost the same for the planed and sawn wood, as calculated by the OWRK and vOCG methods, and the surface free energy of rotary wood samples was lower than that of planed or sawn wood samples. The initial and equilibrium contact angle increased as the viscosity of adhesive increased for all the wood samples, and the contact angles of rotary wood samples were greater than those of planed or sawn wood; however, the K-value was lower. The wettability of the loose side was higher than that of the tight side. Contact angles decreased when surface free energy increased, while the K-value increased.

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Section: Contact Anglementioning

confidence: 99%

Surface Free Energy and Dynamic Wettability of Differently Machined Poplar Woods

Qin¹,

Gao²,

Zhang³

et al. 2014

BioResources

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“…As shown in Table 3, the total surface free energy (S) of the fresh wood samples was higher than that of aged wood samples, which is caused by the presence of extractives Santoni and Pizzo 2011). In the case of the fresh wood samples, the surface free energy of the control wood sample was lower than that of sanded wood samples; the surface free energy was highest at a grit number of 60, but the change was insignificant.…”

Section: Surface Free Energy Componentsmentioning

confidence: 94%

“…For the control sample, the initial contact angle increased by 38.6%, and the contact angle increased by 142% for a grit number of 180. The hydrophobicity of the sanded wood after aging increased remarkably (Nussbaum 1999;Santoni and Pizzo 2011). Santoni and Pizzo (2011) found that the contact angle of fresh sanded poplar wood was 47.0º, while the contact angle was 86.0º for an aged sanded surface.…”

Section: Morphology and Contact Anglementioning

confidence: 99%

“…The hydrophobicity of the sanded wood after aging increased remarkably (Nussbaum 1999;Santoni and Pizzo 2011). Santoni and Pizzo (2011) found that the contact angle of fresh sanded poplar wood was 47.0º, while the contact angle was 86.0º for an aged sanded surface. The migration of extractives and hydrophobic groups from the interior to the exterior may be the primary reason for this.…”

Section: Morphology and Contact Anglementioning

confidence: 99%

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Wettability of Sanded and Aged Fast-growing Poplar Wood Surfaces: I. Surface Free Energy

et al. 2014

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The sanding process influences the surface morphology and chemical components of wood, which are two important factors that influence the surface free energy and wettability of wood. The objective of this study was to investigate the roughness of sanded poplar wood and the effects of sanding and aging on the surface free energy using different methods. The roughness parameter (Ra) decreased as the grit number increased, but no change was evident when the grit number increased from 120 to 240. The contact angle of water on the fresh wood samples decreased as the grit number increased. Fresh wood samples were more easily wetted by water than was the aged wood sample, and the contact angles increased as the surface roughness decreased. The surface free energy of sanded, aged wood obtained by the Zisman method may be unsuitable. For the fresh wood samples, the change of surface free energy and its components were not significantly changed when the grit number was higher than 120; for the aged wood samples, the dispersion component appeared to increase slightly as the grit number decreased. The effect of roughness on the acid/base component, acid component, and base component calculated by the vOCG method was unremarkable. The surface free energy of the wood samples (obtained using the liquid parameters provided by Volpe and Siboni (1997)) can effectively balance the relationship between the acid and base components.

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“…The authors considered that better wetting was associated with higher surface roughness. In a comparison of different types of wood surface machining, planed, sanded and disc sawn surfaces, Santoni and Pizzo (2011) found that the high roughness, produced in the sanding process made more wettable the sanding surfaces. Cool and Hernandez (2011) also measured better wettability on rough surfaces compared to smoother ones.…”

Section: Introduction 1 Uvodmentioning

confidence: 99%

Surface Roughness and Wettability Variation: The effect of Cutting Distance during Milling of Pinus Radiata Wood

2016

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Effect of surface conditions related to machining and air exposure on wettability of different Mediterranean wood species

Cited by 44 publications

References 19 publications

Surface Free Energy and Dynamic Wettability of Differently Machined Poplar Woods

Surface Free Energy and Dynamic Wettability of Differently Machined Poplar Woods

Wettability of Sanded and Aged Fast-growing Poplar Wood Surfaces: I. Surface Free Energy

Surface Roughness and Wettability Variation: The effect of Cutting Distance during Milling of Pinus Radiata Wood

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