Role of additives in wood–polymer composites. Relationship to analogous radiation grafting and curing processes

Ng, Loo‐Teck; Garnett, J. L.; Mohajerani, S.

doi:10.1016/s0969-806x(99)00260-1

Cited by 9 publications

(6 citation statements)

References 9 publications

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“…Sreekala and Thomas reported the reduction of equilibrium water uptake in the range of 30-40 % at different temperature (30-90°C) after surface modification of oil palm fibers with gamma radiation at a dose rate of 0.1 Mrad/h for 30 h [74]. Gamma and electron-beam assisted impregnation of acrylate [73], styrene [75], vinyl acetate [76], and other crosslinked polymers [77] on to LCFs (wood fibers) has resulted wood polymer composites (WPC) with enhanced hardness, tensile strength, scratch resistance, water repellency, and resistance to biodegradation. Surface modification of kenaf fibers with electron-beam irradiation with 200 kGy dosage and 5 % NaOH treatment has been reported to enhance the thermal and dynamic mechanical properties of kenaf/PP biocomposites [78].…”

Section: Chemical Change By Radiation Treatmentmentioning

confidence: 99%

A brief review on the chemical modifications of lignocellulosic fibers for durable engineering composites

et al. 2015

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A brief review has been presented on the existing methods to enhance the durability of lignocellulosic fibers (LCFs) for manufacturing composites for engineering applications. The free hydroxyl groups of the cellulose chains within LCFs tend to attract water molecules in moist environment, which may cause the fibers to swell and the cellulose chains to lose their integrity due to hydrolysis and oxidation imparted by the actions of biogenic enzymes or chemical factors, such as acidity, alkalinity, and salinity or UV irradiation. This study mainly highlights those technologies that present the modifications of cellulose main chain within the LCFs to improve the degradation resistance and mechanical strength. Detailed pros and cons of those chemical modifications have also been presented in this study with possible applications of the composites with special reference to durability.

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Section: Chemical Change By Radiation Treatmentmentioning

confidence: 99%

A brief review on the chemical modifications of lignocellulosic fibers for durable engineering composites

et al. 2015

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“…Generally 10% or more crosslinking agent is needed to give the best improvement in physical or mechanical properties, such as hardness, abrasion resistance, and compression strength as well as bend strength. Composite materials obtained by evacuation of wood (beech, spruce, ash, and tropical wood Pterocarpus vermalis) followed by its impregnation with an unsaturated polyester-MMA-styrene mixture or unsaturated polyester-acrylonitrilestyrene mixture and gamma irradiation-induced curing exhibit decreased water vapor absorption and improved dimensional stability, hardness, compression strength, and wear resistance, compared to untreated wood (Ibach & Ellis, 2005;Ng et al 1999). WPCs with only MMA show a void space at the interface between cell wall and polymer (Fig.…”

Section: Crosslinkersmentioning

confidence: 99%

Wood-Polymer Composites

Li¹

2011

Advances in Composite Materials - Analysis of Natural and Man-Made Materials

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“…In contrast, wood‐polymer composites are obtained by impregnating wood with monomers and initiators and subsequently applying bulk free‐radical polymerization [2, 5–8]. This class of composites attracts increasing interest due to potential construction applications, especially parquet flooring [2, 6].…”

Section: Introductionmentioning

confidence: 99%

“…Other commercial applications include archery bows, billiard cues, golf clubs, musical instruments, office equipment, and knife handles [6]. These materials present better properties than untreated wood, namely, dimensional stability under changing humidity conditions [5, 8–10], mechanical properties [6, 8, 11], and biological resistance [8, 9]. In this context, the main goal of this work is to develop a new type of material by incorporating pieces of wood (in the current case, walnut wood) within a transparent or semitransparent matrix that could be used for the production of furniture or decorative products offering appealing aesthetic features.…”

Section: Introductionmentioning

confidence: 99%

Development of semitransparent wood‐polymer composites

Dias

Alves²,

Fagg

et al. 2012

Vinyl Additive Technology

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A new material has been developed consisting of pieces of wood embedded within a matrix of acrylic polymer, resulting in a transparent or semitransparent wood‐based product. This material presents quite appealing aesthetic features, thereby opening new possibilities for decorative applications. Because acrylic and methacrylic monomers are in the liquid state at room temperature, it is possible to introduce wood (in the current case, walnut wood) into a mixture of acrylic (hydroxypropyl acrylate) and/or methacrylic monomers (methyl methacrylate and 2‐hydroxyethyl methacrylate) along with a plasticizer (dioctyl phthalate) in the presence of a chemical initiator (benzoyl peroxide). A transparent polymeric matrix with dispersed wood is then obtained through bulk free‐radical polymerization. Introducing this reaction mixture along with pieces of wood into a mold results in a wood‐polymer composite. A 24−1 experimental fractional factorial design was implemented to study the importance of the composition of these materials on several relevant properties. The sheets produced were characterized by tensile testing, dynamic mechanical thermal analysis, thermal gravimetric analysis, and heat deflection temperature. The models obtained for predicting each property pointed to valuable insights regarding the influential constituents. In particular, our results suggested that monomers to be used in future applications of this material should be selected in terms of their cost and the desired flexibility for the final product, not in terms of their polarity. J. VINYL ADDIT. TECHNOL., 2012. © 2012 Society of Plastics Engineers

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Role of additives in wood–polymer composites. Relationship to analogous radiation grafting and curing processes

Cited by 9 publications

References 9 publications

A brief review on the chemical modifications of lignocellulosic fibers for durable engineering composites

A brief review on the chemical modifications of lignocellulosic fibers for durable engineering composites

Wood-Polymer Composites

Development of semitransparent wood‐polymer composites

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