Physical properties and molecular mobility of the new wood composite plastic "thermobalite"

Старцев, О. В.; Salin, B. N.; Skuridin, Yu. G.; Utemesov, R. M.; Насонов, А Д

doi:10.1007/s002260050100

Cited by 11 publications

(7 citation statements)

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“…They attributed the reduction of mechanical properties to the reduction of the degree of wettability of wood after the thermal treatment. Startsev et al (1999) used steam explosion to modify wood prior to manufacturing wood-plastic pressed panels (referred to as ''thermobalite''). Mechanical and durability tests showed that MOR was doubled in comparison with particleboard produced with untreated wood.…”

Section: Reduced Water Absorptionmentioning

confidence: 99%

A review of wood thermal pretreatments to improve wood composite properties

et al. 2013

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The objective of this paper is to review the published literature on improving properties of wood composites through thermal pretreatment of wood. Thermal pretreatment has been conducted in moist environments using hot water or steam at temperatures up to 180 and 230°C, respectively, or in dry environments using inert gases at temperatures up to 240°C. In these conditions, hemicelluloses are removed, crystallinity index of cellulose is increased, and cellulose degree of polymerization is reduced, while lignin is not considerably affected. Thermally modified wood has been used to manufacture wood-plastic composites, particleboard, oriented strand board, binderless panels, fiberboard, waferboard, and flakeboard. Thermal pretreatment considerably reduced water absorption and thickness swelling of wood composites, which has been attributed mainly to the removal of M. R. Pelaez-Samaniego

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Section: Reduced Water Absorptionmentioning

confidence: 99%

A review of wood thermal pretreatments to improve wood composite properties

et al. 2013

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“…Data plotted by Engelund et al (2013) indicated a relationship between softening point of hemicellulose, temperature and relative humidity, and led to considering the relation of sorption hysteresis with the glass transition temperature. Startsev et al (1999Startsev et al ( , 2017 concluded that between room temperature and 70°C several peaks are superimposed, including the local mobility of cellulose chains, the glass transition of 'its amorphous part the lignin' and the hemicelluloses plasticized by water. Studies on pure glucomannan and xylan films by Kulasinski et al (2016) have further confirmed the complexity of dynamic mechanical response of hemicellulose in atmospheres of varying relative humidity.…”

Section: Discussionmentioning

confidence: 99%

Dynamic mechanical analysis of Scots pine and three tropical hardwoods

Ashaduzzaman

Hale

Ormondroyd

et al. 2020

International Wood Products Journal

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Dynamic mechanical analysis (DMA) was used to investigate the viscoelastic behaviour of four species of wood, Scots pine, Gmelina, Obeche and Alstonia. Three frequencies (0.1, 1.0 and 10 Hz) were used over a temperature range of -150 to +150°C. All the wood species showed tan δ peaks corresponding with secondary relaxations in the expected range. The low temperature (γ peak) was seen at -115 to -83°C, differing between species and with frequency. β peaks relating to hemicellulose relaxations in association with water molecules were observed, at two locations for Scots pine and three locations in hardwoods. The α peak for lignin lay outside the temperature range studied. Differences in β peaks are proposed to relate to the composition of hemicellulose, and be influenced by structure and level of heterogeneity in the amorphous polymer domains; differing between the wood species studied, which is in-line with currently proposed cell wall polymer models.

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“…Composites have been prepared by subjecting bark particles to high temperature and pressure to react the phenolic components within the bark so that these components cross-link in situ to serve as the sole binder for composites (13). A 1999 publication reported a similar approach for binding wood (36). In that work, birch wood was heated for 1-15 min at 170-230 • C under 2 MPa pressure from hot steam.…”

Section: Advances In Wood Composite Adhesivesmentioning

confidence: 99%

Wood Composites

Matuana

Heiden

2004

Encyclopedia of Polymer Science and Technology

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IntroductionWood composites can be defined as materials made by gluing together small pieces of wood, residue materials from wood processing operations, or other elements into larger materials to produce products with specific definable mechanical and physical properties. Wood composite products continue to be among the most widely utilized building materials throughout the world. They are commonly manufactured as lumber, flooring, roofing, paneling, palettes, decking, fencing, cabinets, furniture, millwork, structural beams, etc.The increased number and importance of wood composite products are directly related to the decreased supply of high quality large timber, and as the quality and variety of wood composite products increases, and new applications for them are found, the trend toward increased use and importance of wood composites should continue. Wood composites offer numerous advantages over lumber. They can be produced from waste wood, agricultural residues, little used and low commercial value wood species, as well as smaller and fast growing trees, which can relieve stress on old growth forests that are increasingly unavailable for use. Also, the increased homogeneity of the raw material obtained by combining small wood elements allows a wide variety of composite products to be produced that have consistent, high quality properties. The properties can often surpass those of lumber (eg, have stronger and more uniform properties throughout the product, and be completely free of growth characteristics, weak spots, or defects such as knots), and often, the product can be produced with customized engineered properties, dimensions, and complex shapes (eg, complex roof shapes, cathedral ceilings, cantilevered supports).The exact properties and the appropriate end use for a composite depend on the wood species and wood adhesive, and are very dependent on the size, shape, Encyclopedia of Polymer Science and Technology.

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Physical properties and molecular mobility of the new wood composite plastic "thermobalite"

Cited by 11 publications

References 0 publications

A review of wood thermal pretreatments to improve wood composite properties

A review of wood thermal pretreatments to improve wood composite properties

Dynamic mechanical analysis of Scots pine and three tropical hardwoods

Wood Composites

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