Surface Activation and Adhesion Properties of Wood-Fiber Reinforced Thermoplastic Composites

Gupta, Barun Shankar; Laborie, Marie‐Pierre

doi:10.1080/00218460701751814

Cited by 25 publications

(34 citation statements)

References 19 publications

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“…Timber's unique characteristics, like wood porosity, lumen penetration, and the complex chemistry of wood, including the effect of extractives, makes the wood adhesion phenomenon all the more complex [7][8][9][10][11][12] and general theories of bond formation can not explain the difference between a durable and a non-durable bond. In addition, while surface activation may be sufficient to improve both short-term adhesion and durability of bonded joints with non-cellulosic adherends [13,14], and to improve short-term adhesion of certain adhesives to timber [4,[15][16][17][18][19][20][21][22], facing the results obtained here it seems that in the case of wood adherends the simple fact of activating the timber surface does not translate directly into an improvement of the bonded joint durability. Epoxies and most other in situ polymerised adhesives generate polymers with a high degree of chain cross-linking and very limited flexibility, which serve well in providing adhesive bonds with the creep resistance required for structural timber bonds [23].…”

Section: Discussionmentioning

confidence: 99%

Evaluation of Adhesion Promotion Techniques for Structural Bonded Timber Joints

Custódio

Broughton

Cruz

2011

The Journal of Adhesion

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Long-term durability of a structural adhesive joint is an important requirement, because it has to be able to support the required design loads, under service conditions, for the planned lifetime of the structure. Epoxy adhesives, whilst not ideal, are currently the best family of adhesives for in situ repair operations. As long as the bonded joint remains dry and unexposed to high service temperatures, epoxy adhesives produce strong bonds to timber. However, once they are exposed to severe stresses as a result of repeated water soaking and drying cycles, the bonded joint delaminates and does not fulfill the requirements for structural timber adhesives intended for exterior exposure. One way of improving bond durability is through the use of surface treatments prior to bonding. In this study, the effects of corona discharge surface treatment, hydroxymethylated resorcinol (HMR) and c-glycidoxypropyltrimethoxysilane (GPMS) adhesion promoters on the durability enhancement of pine, iroko, and oak bonded joints were evaluated. The results proved that surface modification methods for adhesion promotion can be adapted to cellulosic substrates with significant improvements in bonded joint durability.

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Section: Discussionmentioning

confidence: 99%

Evaluation of Adhesion Promotion Techniques for Structural Bonded Timber Joints

Custódio

Broughton

Cruz

2011

The Journal of Adhesion

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“…Therefore, process control is a critical aspect and the final surface modifications strongly depend on it [123]. This method is also applied to impart reactive groups on the polymeric surface and to promote polymer adhesion [9,[129][130][131]. In polyethylene-lignocellulosic composites, Felix et al [132], studied the modification of cellulose fibres with oxygen plasma and characterised the interface in the system cellulose with LLDPE.…”

Section: Chemical Pre-treatments Of Lignocellulosic Fibresmentioning

confidence: 99%

Polyethylene Composites with Lignocellulosic Material

Fernandes

Mano

Reis

2015

Polyethylene‐Based Blends, Composites and Nanocomposites

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The aim of this chapter is to describe in detail the advances in polyethylene reinforced with lignocellulosic material. Indeed, the successful employment of natural based materials to reinforce/improve the properties of polyolefins has been growing in a wide range of applications. Firstly, basic concepts and terminology adopted in the lignocellulosic composite materials are reviewed. The objective is to bring the reader's attention to important issues that must to be taken into account when working in this subject as well as by providing the most appropriate references for those with interest to delve into the topic. In the context of polyethylenelignocellulosic composites, ongoing research is then summarised mainly focussing on (i) the main aspects related to the selection of the commonly used lignocellulosic materials and the potential of its main chemical constituents, (ii) the principal methods used for the improvement of interfacial adhesion and (iii) the main adopted processing routes and the composite properties. Finally, applications, new challenges and opportunities of these polyethylene-lignocellulosic composites are also discussed.

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“…Plasma treatment [7,8], corona discharge treatment [9], flame treatment [10], and chromic acid treatment [11] have been demonstrated to effectively improve the surface free energy and surface wettability of WPCs. However, these treatments demand harsh modification conditions, relatively high cost, and complex operational processes.…”

Section: Introductionmentioning

confidence: 99%

Decorating wood flour/HDPE composites with wood veneers

Guo

Wang

et al. 2016

Polymer Composites

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The low surface free energy makes wood plastic composites difficult to bond with traditional adhesives, such as urea formaldehyde resin (UF). This study investigates the decoration of wood flour/high‐density‐polyethylene composite (WF/HDPE) board with poplar wood veneers. High‐density polyethylene (HDPE) or maleic anhydride grafted polyethylene (MAPE) film was introduced between the veneer and the WF/HDPE composite board as an intermediate component to strengthen the bond. Surface bonding strength, hot water resistance, and bending performance of the composites were then evaluated. Contact angle, Attenuated total reflection‐Fourier transform infrared (ATR‐FTIR) spectroscopy, and scanning electron microscopy (SEM) were used to analyze the interface of the wood veneer and the WF/HDPE composites. The addition of MAPE film enhanced the polar characteristic of the WF/HDPE composite surface and increased the number of functional groups reacting with the –OH groups present in the wood veneer. A MAPE intermediate film increased the surface bonding strength of the wood veneer to WF/HDPE composite surface, and also endured boiling water without delimitation failure. After being covered with the wood veneer, the flexural strength and modulus of WF/HDPE composite panels increased four times comparing to that of the uncovered composites. POLYM. COMPOS., 39:1144–1151, 2018. © 2016 Society of Plastics Engineers

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Surface Activation and Adhesion Properties of Wood-Fiber Reinforced Thermoplastic Composites

Cited by 25 publications

References 19 publications

Evaluation of Adhesion Promotion Techniques for Structural Bonded Timber Joints

Evaluation of Adhesion Promotion Techniques for Structural Bonded Timber Joints

Polyethylene Composites with Lignocellulosic Material

Decorating wood flour/HDPE composites with wood veneers

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