Application of surface chemical functionalized cellulose nanocrystals to improve the performance of UF adhesives used in wood based composites - MDF type

Khanjanzadeh, Hossein; Behrooz, Rabi; Bahramifar, Nader; Pinkl, Stefan; Gindl‐Altmutter, Wolfgang

doi:10.1016/j.carbpol.2018.10.115

Cited by 78 publications

(41 citation statements)

References 53 publications

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“…Compared with the micrograph of the pure WPU, WPU/SCNC films exhibited a rougher surface due to the incorporation of SCNC and related limitations on chain mobility of the WPU matrix. A large number of small white spots appeared on the fracture surface containing 0.25 and 0.50 wt % by weight of SCNC, and the white point corresponded to SCNC in the vertical plane of the film . The white spots were evenly distributed throughout the fracture surface, confirming that the microscopic solid phase SCNC has good compatibility with the WPU matrix.…”

Section: Resultsmentioning

confidence: 74%

Modified cellulose nanocrystals enhancement to mechanical properties and water resistance of vegetable oil‐based waterborne polyurethane

Zhang

Fan

et al. 2019

J of Applied Polymer Sci

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Environmentally friendly and lightweight silylated cellulose nanocrystal (SCNCs)/waterborne polyurethane (WPU) composite films that exhibit excellent mechanical properties and water resistance were prepared. The cellulose nanocrystals (CNCs) of the filamentous structure were surface-modified by γ-aminopropyltriethoxysilane (APTES) and then introduced into a castor oil-based aqueous polyurethane (WPU) matrix by in situ polymerization. The morphology and silylation degree of CNCs were characterized by scanning electron microscopy (SEM), thermogravimetric analysis (TGA), and Fourier infrared transform spectroscopy at different APTES concentrations. The results showed that the surface of the nanocellulose crystal has the best silylation morphology and thermal stability with incorporation of 6 wt % APTES. The thermal stability, mechanical properties, surface morphology, and water resistance of the nanocomposites were investigated by TGA, tensile test, SEM and optical contact angle, water absorption test, and mechanical property test after immersed in water. It was found that the effective introduction of modified CNCs resulted in a significant increase in tensile strength at high levels, and the thermal stability and hydrophobicity of the material were improved simultaneously, reaching the percolation threshold at a 0.50 wt % SCNCs as determined theoretically. This study provided an approach to the design and development of surface-modified CNCs/vegetable oil-based polymer composites by using an appropriate concentration of silane coupling agent to modify CNCs and improve the compatibility between nanocellulose and vegetable oil-based polymer matrices.

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Section: Resultsmentioning

confidence: 74%

Modified cellulose nanocrystals enhancement to mechanical properties and water resistance of vegetable oil‐based waterborne polyurethane

Zhang

Fan

et al. 2019

J of Applied Polymer Sci

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“…[ 264 ] 3‐Aminopropyltriethoxysilane‐modified CNC was explored to modify urea‐formaldehyde adhesive for the production of medium‐density fiberboard. [ 265 ] Moreover, CNF has been used as a reinforcing additive in urea‐formaldehyde resin formulations. [ 266 ] Epoxy resins have been modified using CNCs and in combination with calcium sulfate fillers, showing improvement of the adhesive properties, [ 267 ] as well as allowing pressure sensitive acrylic glues.…”

Section: Nanocellulose‐based Hybrid and Functional Hydrogelsmentioning

confidence: 99%

Nanocellulose: Recent Fundamental Advances and Emerging Biological and Biomimicking Applications

et al. 2020

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In the effort toward sustainable advanced functional materials, nanocelluloses have attracted extensive recent attention. Nanocelluloses range from rod‐like highly crystalline cellulose nanocrystals to longer and more entangled cellulose nanofibers, earlier denoted also as microfibrillated celluloses and bacterial cellulose. In recent years, they have spurred research toward a wide range of applications, ranging from nanocomposites, viscosity modifiers, films, barrier layers, fibers, structural color, gels, aerogels and foams, and energy applications, until filtering membranes, to name a few. Still, nanocelluloses continue to show surprisingly high challenges to master their interactions and tailorability to allow well‐controlled assemblies for functional materials. Rather than trying to review the already extensive nanocellulose literature at large, here selected aspects of the recent progress are the focus. Water interactions, which are central for processing for the functional properties, are discussed first. Then advanced hybrid gels toward (multi)stimuli responses, shape‐memory materials, self‐healing, adhesion and gluing, biological scaffolding, and forensic applications are discussed. Finally, composite fibers are discussed, as well as nanocellulose as a strategy for improvement of photosynthesis‐based chemicals production. In summary, selected perspectives toward new directions for sustainable high‐tech functional materials science based on nanocelluloses are described.

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“…Reaction scheme between 3-aminopropyltriethoxysilane (APTES) and cellulose nanocrystals (CNC) in the presence of water. Reproduced from [53] with permission from Elsevier and Copyright Clearance Center, 2018.…”

Section: Figurementioning

confidence: 99%

Brief Overview on Bio-Based Adhesives and Sealants

et al. 2019

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Adhesives and sealants (AS) are materials with excellent properties, versatility, and simple curing mechanisms, being widely used in different areas ranging from the construction to the medical sectors. Due to the fast-growing demand for petroleum-based products and the consequent negative environmental impact, there is an increasing need to develop novel and more sustainable sources to obtain raw materials (monomers). This reality is particularly relevant for AS industries, which are generally dependent on non-sustainable fossil raw materials. In this respect, biopolymers, such as cellulose, starch, lignin, or proteins, emerge as important alternatives. Nevertheless, substantial improvements and developments are still required in order to simplify the synthetic routes, as well as to improve the biopolymer stability and performance of these new bio-based AS formulations. This environmentally friendly strategy will hopefully lead to the future partial or even total replacement of non-renewable petroleum-based feedstock. In this brief overview, the general features of typical AS are reviewed and critically discussed regarding their drawbacks and advantages. Moreover, the challenges faced by novel and more ecological alternatives, in particular lignocellulose-based solutions, are highlighted.

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Application of surface chemical functionalized cellulose nanocrystals to improve the performance of UF adhesives used in wood based composites - MDF type

Cited by 78 publications

References 53 publications

Modified cellulose nanocrystals enhancement to mechanical properties and water resistance of vegetable oil‐based waterborne polyurethane

Modified cellulose nanocrystals enhancement to mechanical properties and water resistance of vegetable oil‐based waterborne polyurethane

Nanocellulose: Recent Fundamental Advances and Emerging Biological and Biomimicking Applications

Brief Overview on Bio-Based Adhesives and Sealants

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