Composites made from acetylated lignocellulosic fibers of different origin

Gomez-Bueso, J.; Westin, Mikael; Torgilsson, R.; Olesen, P. O.; Simonson, Rune

doi:10.1007/s001070050069

Cited by 10 publications

(5 citation statements)

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“…The water swelling behavior of fiberboards can be reduced by introducing hydrophobic components such as wax and lipids; acetylating the fibers; modifying the traditional UF resin with melamine; or selecting resins (adhesives) comprising components of higher hydrophobicity, such as phenol formaldehyde (PF) or MDI resin. , Even the addition of divalent ions such as Ca 2+ can reduce the water swelling properties of fiberboards. , Consequently, the chemical composition of the fibers in wood-based fiberboards is often more favorable for obtaining improved water resistance than that in fiberboards based on most annual plant fibers.…”

Section: Resultsmentioning

confidence: 99%

Manufacture of High-Performance Rice-Straw Fiberboards

Halvarsson¹,

Edlund²,

Norgren³

2010

Ind. Eng. Chem. Res.

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Rice straw, a waste agriculture material grown and harvested in Willows, CA, was used as a raw material in the production of thin medium-and high-density fiberboards (MDFs and HDFs). The rice straw was cleaned, size-reduced, and soaked in water before being refined. Defibration was performed in a pressurized pilotplant single-disk refiner, OHP 20". The fiber production capacity reached a level of 63 kg/h, and the proper fiber quality for MDF/HDF production was established. Analysis of the produced fiber showed an average fiber length of approximately 0.9 mm, an average fiber width of 31 µm, a shive weight of below 24%, and a dust content of less than 30%. Production of fiberboards was performed by addition of 3%, 4%, and 5% methylene diphenyl diisocyanate (MDI). The flexural properties, internal bond strength, and thickness swelling of the produced fiberboards were evaluated according to ASTM methods. The finished fiberboards based on rice straw and MDI resin showed excellent properties. The internal bond (IB) reached levels of 2.6 MPa, and the modulus of rupture (MOR) and modulus of elasticity (MOE) showed levels comparable to those of woodbased fiberboards and were acceptable according to the requirements of medium-density fiberboard (MDF) for interior applications (American National Standards Institute, ANSI A208.2-2002). The water-repelling properties of the 3-mm rice-straw fiberboards were encouraging; the thickness swelling (TS) was in the range of 15-30%. Two different methods to avoid adhesion between the press plates and the resinated fiber material during hot pressing were investigated: protective paper sheets were placed between the fiber mat and press plates, or a press-release agent was sprayed on steel plates that were then placed in the press before pressing. Satisfactory results were obtained with both methods, and no adhesion was observed between the fiberboard and the steel plates. The method of using press-release agent during pressing had no notable negative effects on the fiberboard properties.

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Section: Resultsmentioning

confidence: 99%

Manufacture of High-Performance Rice-Straw Fiberboards

Halvarsson¹,

Edlund²,

Norgren³

2010

Ind. Eng. Chem. Res.

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“…(Ozmen, 2007), and oriented strand boards (OSB) (Rowell and Plackett, 1988) as well as other lignocellulosic resources such as bamboo (Phyllostachys bambusoides Sieb. et Zucc) (Rowell and Norimoto, 1987), bagasse (Saccharum officinarum L.) fibre (Rowell and Keany, 1991), jute (Corchorus olitorius) (Callow, 1951;Andersson and Tillman, 1989), kenaf (Hibiscus cannabinus) (Rowell and Harrison, 1993), wheat straw (Triticum aestivum) (Gomez-Bueso et al, 1999), pennywort (Centella asiatica), and water hyacinth (Eichhornia crassipes) (Rowell and Rowell, 1989). A more detailed overview of species and acetylation conditions is given in Table 3.…”

Section: Acetylationmentioning

confidence: 99%

A Review of Wood Modification Globally – Updated Findings from COST FP1407

Jones¹,

Sandberg

2020

IPBE

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Wood modification (chemical, thermal, impregnation) represents an assortment of innovative processes continually being adopted in the wood protection sector. COST Action FP1407 “Understanding wood modification through an integrated scientific and environmental impact approach — ModWoodLife” was initiated in 2015, with its 4-year programme aiming to investigate modification processing and products design with emphasis on their environmental impacts. Among the final tasks within COST FP1407 was to re-evaluate the current status of wood modification across the member countries. However, it became clear that activities in other European countries needed to be addressed, and as a result, a more extensive evaluation of wood modification processes across Europe was undertaken, as well as determining the activities globally. This paper outlines some of the recent updates in wood modification, along with summarising data collected by the authors from international colleagues and online sources, so providing an evaluation of the overall global position. These figures suggest that wood modification is undergoing a significant increase in production due to demand, with levels of recent growth seemingly suggesting this will continue for the coming years. Based on data gathered, the global commercial production of modified wood is dominated by thermal modification processes, which produce 1,110,000 m3/year. Among the other commercialised processes, acetylation accounts for 120,000 m3/year and furfurylation 45,000 m3/year. A further global production of around 330,000 m3/year is estimated for other processes, predominantly based on resin-based systems (e.g., Impreg- and Compreg-based processes).

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“…Another treatment method widely used nowadays is acetylation 4, 23, 24. Treating the cellulose fibers with an acetic acid solution leads to a reaction within the hydroxyl groups of the cellulose and the acid and subsequent esterification.…”

Section: Introductionmentioning

confidence: 99%

Thermal and thermomechanical properties of biocomposites made from modified recycled cellulose and recycled polypropylene

Espert

Camacho

Karlson

2003

J of Applied Polymer Sci

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ABSTRACT:Residual cellulose fibers from the paper industry have been used as reinforcements in recycled polypropylene (PP) composites. The main obstacle to obtaining good properties with this biocomposite is deficiencies in the compatibility between the nonpolar matrices and the polar cellulose fibers used as reinforcements. The aim of this work was to improve the compatibilization between these cellulose fibers and the PP matrix with four different methods: modification by the addition of polypropylene-maleic anhydride copolymer (PPgMA) during the process of blending, preblending modification of the cellulose with a solution of PPgMA, modification of cellulose by silanes (vinyltrimethoxysilane), and acetylation of cellulose. Blends with all of the differently modified celluloses were prepared with the cellulose content varied up to 40%, and then all of the blends were subjected to thermal (differential scanning calorimetry and thermogravimetric analysis) and thermomechanical (dynamic mechanical thermal analysis) analyses. The results showed that the addition of cellulose fibers improved the thermomechanical behavior of the PP, increasing the value of the log of the dynamic modulus, and affected the thermal and thermooxidative behavior. Moreover, an advantage of the use of a recycled PP containing a small quantity of ethyl vinyl acetate (EVA) as a prime material in the composition was the enhancement of mechanical properties. The use of these methods for the modification of cellulose led to more desirable thermal and thermooxidative stabilities.

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Composites made from acetylated lignocellulosic fibers of different origin

Cited by 10 publications

References 0 publications

Manufacture of High-Performance Rice-Straw Fiberboards

Manufacture of High-Performance Rice-Straw Fiberboards

A Review of Wood Modification Globally – Updated Findings from COST FP1407

Thermal and thermomechanical properties of biocomposites made from modified recycled cellulose and recycled polypropylene

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