Surface treatment of wood polymer composites for adhesive bonding

Moghadamzadeh, H.; Rahimi, Hamid; Asadollahzadeh, Mehdi; Hemmati, Alireza

doi:10.1016/j.ijadhadh.2011.08.001

Cited by 56 publications

(44 citation statements)

References 43 publications

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“…The largest contact angle was found in the reference variant, with a mean of 94.1° and the lowest mean, 82.7°, was seen in the modification with H2O. A smaller contact angle is better for the strength of a glued joint (Banea and Silva 2008;Moghadamzadeh et al 2011). The variant with H2O exhibited a significant difference from the others, but there was no significant difference between the reference and NaOH variants.…”

Section: H2omentioning

confidence: 84%

Chemical and Physical Parameters of Different Modifications of Rape Straw (Brassica napus L.)

et al. 2017

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Material alternatives to wood, such as rape straw, are needed for the production of composite materials. This study performed an analysis of rape straw as a composite material source for production. There were three types of rape straw particle modification: untreated particles as reference variant, boiling in water, and soaking in sodium hydroxide (NaOH) solution. The pH and calorific value were highest for the variant soaked in NaOH. The total elemental content and the elements on the rape straw surface varied between variants. The modification method chosen influenced the pH, calorific value, elemental composition, and contact angle. Keywords INTRODUCTIONRecently there has been an effort to develop new composite materials using alternative sources of raw materials. This trend is largely explained by population growth, which contributes directly to a limited supply of natural resources, as well as wood shortage in all wood processing industries (Galor and Weil 2000;Bektas et al. 2005;Seintsch 2011;Lauri et al. 2012). One alternative source of raw materials is post-harvest rapeseed crop residue (Mohanty et al. 2002;Dziurka et al. 2015). As a prospective raw material, rapeseed has many advantages, as it is available in large quantities and is not yet used in other products with high added value (Bečka et al. 2007;Dukarska et al. 2017). However, waxy and siliceous substances are present on the surface of winter rape stems, which prevents the formation of quality adhesion between particle and adhesive (Grigoriou 2000). This is the main disadvantage of particles from annual plants compared to wood particles. The chemical composition differs between internal and external areas of the stem because of cuticles and epicuticular waxes (Wiśniewska et al. 2003;Trischler, and Sandberg 2014). The surface has a strong impact on the water contact angle, which deteriorates the wetting of particles by adhesives, since adhesives used in particleboard production are mainly water-based (Wiśniewska et al. 2003). Therefore, it is necessary to pre-treat these particles from annual plants before the production of the composite material itself (Mahlberg et al. 1999;Cao et al. 2017). This modification can PEER-REVIEWED ARTICLE bioresources.com Částková et al. (2018). "Modified rape straw," BioResources 13(1), 104-114. 105 be done in various ways (Pelaez-Samaniego et al. 2013;Trischler and Sandberg 2014). Boiling in water is regarded favorably as a treatment due to its ease of implementation (Bekhta et al. 2013). An alternative is alkaline treatment, which breaks ester linkages between wax and lignocellulose, as well as dissolving wax and lignin (Binod et al. 2010;Wan et al. 2011). In this study, winter rape chips were modified by applying hydrothermal and chemical (soaking in sodium hydroxide) processes (Xie et al. 2010;Bekhta et al. 2013). It is assumed that the modification destroys the waxy, siliceous substances on the surface of the chips and consequently improves adhesion in the composite product. This study characterized the phys...

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Section: H2omentioning

confidence: 84%

Chemical and Physical Parameters of Different Modifications of Rape Straw (Brassica napus L.)

et al. 2017

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“…Many surface treatment methods, such as flame treatment, water treatment, chromic acid treatment, oxyfluorination treatment, oxygen plasma treatment, and coupling agent coating treatment, are found in the present literature Oporto et al 2007;Laborie and Gupta 2008;Wolkenhauer et al 2008;Moghadamzadeh et al 2011;Sogutlu et al 2016;Sogutlu 2017). Besides the individual surface treatments mentioned, a combined treatment was also employed to treat the WPCs materials.…”

Section: Introductionmentioning

confidence: 99%

“…For example, Gramlich et al (2006) combined flame and water surface treatments to treat the surface of the WPCs. Moghadamzadeh et al (2011) employed a combination treatment of sanding followed by a corona discharge treatment to improve the bonding strengths of the WPCs. The experimental results showed that the combined treatment for the composites would produce better bonding performance, and the combination of the two treatment methods may display an unexpected synergetic action.…”

Section: Introductionmentioning

confidence: 99%

Combined Surface Treatment of Polyethylene Wood-plastic Composites to Achieve Rapid Bonding with Desired Adhesion Properties

et al. 2017

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To achieve rapid bonding with desired adhesion properties, a combined treatment of sanding then coating with polyisocyanate, followed by plasma discharge was implemented on the surfaces of polyethylene wood-plastic composites (WPCs). The surface properties of polyethylene WPCs were studied by evaluating the contact angle and bonding strength, as well as analyzing it via Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and X-ray photoelectron spectroscopy (XPS). The results indicated that the shear strength and durability of the bonding joints of polyethylene WPCs increased considerably due to the synergetic effect from the surface treatment. Thus, a rapid bonding with desired adhesion properties of polyethylene WPCs was achieved. The roughness and the oxygen content on the composites' surface increased after the combined treatment. Polar functional groups, such as -OH, -C=O, and -O-C=O, formed on the surface. At the same time, the presence of -NCO and -NH functionalities, generated during the combined treatment, showed that chemical bondings between polyisocyanate and the wood fibers of the composites occurred. The changes on the surface properties, such as roughness, wettability, as well as formation of chemical groups, substantially affected the adhesion properties of the bonding joint for polyethylene WPCs.

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“…Dimitriou y colaboradores por ejemplo trataron la superficie de un WPC elaborado con PP y harina de abeto usando peróxido de hidrógeno, logrando un incremento de la fuerza adhesiva de 36,4% (750 N) (Dimitriou et al, 2016). Los tratamientos de oxidación de la superficie por medio de gases ionizados como descarga de corona, plasma a baja presión y plasma son los más comunes en la actualidad (Moghadamzadeh et al, 2011;Oporto et el., 2010) Otra manera para aumentar la energía superficial y por ende la capacidad del substrato para formar uniones adhesivas es mediante la fijación sobre la superficie de sustancias con grupos funcionales o injertos de monómeros polares. Usualmente estas sustancias se aplican en forma de primers.…”

Section: Introductionunclassified

Análisis de Juntas Adhesivas Elaboradas con (Lámina de Madera Plástica) / (Adhesivo Ecológico) / (Lámina de Madera Plástica)

2017

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ResumenSe realizó un estudio experimental para medir la fuerza adhesiva de dos láminas de composición similar unidas con adhesivo. Las láminas se fabricaron a partir de polietileno con 32% de harina Telinne monspessulana y 5,2% de polietileno maleatado. Se usaron dos tipos de adhesivos ecológicos: poliuretano en dispersión acuosa y goma caliente de etilen vinil acetato (hot melt). Los substratos o superficies a unir de cada lámina previamente fueron sometidos a abrasión mecánica. Posteriormente las superficies fueron tratadas por separado con silano vinil-tri(2-metoxi etoxi), primer acrílico y diisocianato. La resistencia a la separación de ambos substratos denominada fuerza adhesiva de la junta, fue determinada aplicando la prueba 180º T-peel adhesión. Los tratamientos químicos aumentaron la resistencia adhesiva de las juntas unidas con poliuretano, los valores más altos se obtuvieron al unir los substratos con adhesivo hot melt sin tratamiento químico. La adición de agente maleatado en el compuesto de madera plástica no mejoró la eficiencia de los tratamientos químicos.Palabras clave: madera plástica; junta adhesiva; polietileno de baja densidad; peel adhesión; primer, adhesivo. Analysis of Bonded Joints Made with (Wood Plastic Composite Sheet) / (Ecological Adhesive) / (Wood Plastic Composite Sheet) AbstractAn experimental study was performed to measure the resistance to adhesive peel strength of two sheets of similar composition bonded with adhesive. The sheets were made from polyethylene with 32% Telinne monspessulana flour and 5.2% maleated polyethylene. Two types of eco-friendly adhesives were used: aqueous dispersion polyurethane and hot melt ethylene vinyl acetate base. The substrates or surfaces to be bonded from each sheet previously were subjected to mechanical abrasion. Subsequently the surface was treated with vinyl tri (2 -methoxyethoxy) silane, acrylic and diisocyanate primers. The resistance to the separation of both substrates also named as adhesive force of the joint, was determined with the test 180º T-peel adhesión. Chemical treatments increased the peeling strength in the bonded joints with polyurethane water-based, however higher values were obtained by joining the substrates with hot melt adhesive without chemical treatment. The addition of maleate in the wood plastic composite did not improve the efficiency of chemical treatments.

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Surface treatment of wood polymer composites for adhesive bonding

Cited by 56 publications

References 43 publications

Chemical and Physical Parameters of Different Modifications of Rape Straw (Brassica napus L.)

Chemical and Physical Parameters of Different Modifications of Rape Straw (Brassica napus L.)

Combined Surface Treatment of Polyethylene Wood-plastic Composites to Achieve Rapid Bonding with Desired Adhesion Properties

Análisis de Juntas Adhesivas Elaboradas con (Lámina de Madera Plástica) / (Adhesivo Ecológico) / (Lámina de Madera Plástica)

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