The hydrophobic properties of bark extractives

Borgin, K.; Corbertt, Kathleen

doi:10.1007/bf00353681

Cited by 10 publications

(8 citation statements)

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“…For each lignocellulosic material, chemical components were determined according to the standard methods. These include extractive content, 34 cellulose content, 35 hemicellulose content, 36 solubilities in cold and hot water, 37 and ash content. 38…”

Section: Methodsmentioning

confidence: 99%

Effects of aqueous extraction on the performance and properties of polypropylene/wood composites fromPhoenix dactyliferaandAcacia tortiliswood

Aref

Nasser

Ali

et al. 2013

Journal of Reinforced Plastics and Composites

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Polypropylene/wood composites were prepared by melt blending technique using a twin screw extruder and subsequently ASTM samples were also prepared by injection molding technique. Untreated and pre-treated particles of Phoenix dactylifera and Acacia tortilis woods are used in this study to investigate the effect of pre-treatments on the different properties of polypropylene/wood composites. The tensile strength of the wood composites was evaluated by ASTMD-638 method and it was found to be higher than the neat polypropylene. The effect of incorporation of wood particles on the melting temperature ( T m), crystallization temperature ( T c) and relative crystallinity ( X c) was also studied and reported. The viscoelastic properties of the PP/wood composites were evaluated. The temperature sweep experiments reveals that the composites storage modulus ( G′) has higher values than the neat polypropylene at elevated temperature. The water uptake test showed that the composite samples have improved water repletion properties. Water uptake of untreated PP/date palm composites increased from 0.042% after 2 h to 0.12% after 120 h of immersion time. Pre-treated date palm reduced water uptake to 0.077% after 120 h of immersion time. Similar trend was also observed for the composites prepared from A. tortilis wood. The interaction between the wood and the polymer matrix was characterized by Fourier transform infrared spectroscopy technique. The interfacial and the distribution of the wood particles in the polymer matrix were also investigated by scanning electron microscopy.

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Section: Methodsmentioning

confidence: 99%

Effects of aqueous extraction on the performance and properties of polypropylene/wood composites fromPhoenix dactyliferaandAcacia tortiliswood

Aref

Nasser

Ali

et al. 2013

Journal of Reinforced Plastics and Composites

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“…Wood samples (Pinus sylvestris) from Norwegian stave churches and other wooden constructions several hundred years old were studied by Borgin (1970Borgin ( , 1971. He observed a slow disintegration of the outer layer of the fibres.…”

Section: Effects Visible In Structurementioning

confidence: 99%

13. Degradation by Light and Ionizing Rays

1983

Wood

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“…The magnitude and mechanism of protection of wood treated with water repellents have been extensively studied and described (Banks 1971;Banks and Voulgaridis 1980;Banks and Carragher 1984;Borgin 1968;Borgin and Corbett 1971;Miniutti et al 1961;Purslow and Williams 1978;Rowell and Banks 1985;Verrall 1959). The principal components of WRFs are: (1) a synthetic resin, and (2) a hydrophobic substance (usually paraffin wax).…”

Section: Introductionmentioning

confidence: 98%

“…Such resinous or wax-like materials are natural resins (oleoresin) and their derivatives (gum rosin) as well as extractives from bark, wood or needles. The theory of using bark extractives as hydrophobic substances in WRFs was based on their natural property to act as bridging agent between the hydrophilic cell wall material and the hydrophobic bark extractives (Borgin and Corbett 1971). Extractives from wattle (Acacia mearnsii), chestnut (Castanea sativa), Aleppo pine (Pinus halepensis), loblolly pine (Pinus taeda) and broadleaved oak (Quercus conferta) were found to be effective water barriers to a varying degree when incorporated in water repellent solutions and applied to wood (Bariska and Pizzi 1986;Borgin and Corbett 1974;Marshall et al 1974;Passialis et al 1995;Van Leemput et al 1987).…”

Section: Introductionmentioning

confidence: 99%

Water Repellent Efficiency of Organic Solvent Extractives from Aleppo Pine Leaves and Bark Applied to Wood

Passialis¹,

Voulgaridis²

1999

Holzforschung

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Natural wax-like materials were extracted from leaves and bark of Aleppo pine (Pinus halepensis Mill.) by using toluene as organic solvent. Experimental water repellent formulations (WRFs) were prepared using 10 % gum rosin as the resin constituent and 0 %, 1 % and 2 % paraffin wax, pine needle/bark extracts or mixtures of paraffin wax and needle/bark extracts in proportion 1 : 1 as hydrophobic substance. All experimental WRFs applied to small, cross-sectional wood specimens of Scots pine (Pinus sylvestris L.) and beech (Fagus sylvatica L.). Wood specimens were impregnated by a simple immersion technique and the water repellent effectiveness (WRE) was assessed by using tangential swelling data. Toluene soluble extracts from needles and bark applied to wood provided hydrophobic properties to pine and beech wood specimens but to a lesser degree when compared to paraffin wax. Bark extracts appeared to be stronger hydrophobic materials than needle extracts. Both needle and bark extracts can be successful substitutes for paraffin wax in WRFs up to 50 %. The degree of protection provided by WRFs and the differences between treatments were smaller in pine heartwood and beech sapwood than in pine sapwood.Holzforschung 53 (1999) 151-155 Holzforschung / Vol. 53 / 1999

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The hydrophobic properties of bark extractives

Cited by 10 publications

References 0 publications

Effects of aqueous extraction on the performance and properties of polypropylene/wood composites fromPhoenix dactyliferaandAcacia tortiliswood

Effects of aqueous extraction on the performance and properties of polypropylene/wood composites fromPhoenix dactyliferaandAcacia tortiliswood

13. Degradation by Light and Ionizing Rays

Water Repellent Efficiency of Organic Solvent Extractives from Aleppo Pine Leaves and Bark Applied to Wood

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