Changes in mechanical and chemical wood properties by electron beam irradiation

Schnabel, Thomas; Huber, H.; Grünewald, Tilman A.; Petutschnigg, Alexander

doi:10.1016/j.apsusc.2015.01.142

Cited by 23 publications

(7 citation statements)

References 32 publications

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“…Li et al found that EB radiation enhanced the interfacial interaction between carbon nanotubes and the substrate, thus improving the elongation at break of carbon nanotube/epoxy composites. Additionally, low-energy EB radiation can cleave the chemical bonds in lignin (O-H bonds) and holocellulose (ether bonds), leading to the formation of free radicals, which are conducive to react with the added monomer to enhance the surface binding force of wood, as proven in previous literatures (Croitoru et al 2014;Schnabel et al 2015). More importantly, the aforementioned research indicates that the shortcomings of superhydrophobic wood surfaces can be anticipated to be addressed by combining the EB radiation technology.…”

Section: Introductionmentioning

confidence: 71%

Development of highly durable superhydrophobic and UV-resistant wood by E-beam radiation curing

Xiong

Zhang

et al. 2021

Cellulose

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Developing a practical strategy to fabricate an anti-abrasion and durable superhydrophobic wood surface with ultraviolet (UV) resistance has great practical signi cance for expanding the application of natural wood. In this study, a robust superhydrophobic layer with a hierarchical micro/nano-roughness structure was modi ed on the wood surface through in-situ mineralization and polymerization using a simple solgel method along with e cient electron beam (EB) curing technology. Hydrophobic agent (polydimethylsiloxane, PDMS), and crosslinking monomer (γ-methacryloxypropyl trimethoxysilane, MAPS) form new covalent bonds between TiO 2 particle layer and wood substrate after EB radiation which endows robust superhydrophobicity and remarkable UV resistance on the wood surface. The asprepared wood exhibited a water contact angle (WCA) of approximately 165.7° and obvious repellency to many aqua-phase liquids (cola, strongly acidic, alkaline droplets etc.). Furthermore, the hierarchical micro/nano-protrusion structures remained unchanged and micro/nano particles aggregated tightly on the as-prepared wood surface under harsh external environments (sandpaper abrasion and, ultrasonic treatment), con rming the desirable anti-abrasion and mechanically durable performance of the superhydrophobic surface. After the 18-day UV accelerated weathering test, the TiO 2 particle layer conspicuously retained the discoloration and maintained its exceptional repellency toward water. The biomimetic superhydrophobic wood with excellent mechanical durability and UV resistance reveals its potential application in the furniture and architecture elds.

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Section: Introductionmentioning

confidence: 71%

Development of highly durable superhydrophobic and UV-resistant wood by E-beam radiation curing

Xiong

Zhang

et al. 2021

Cellulose

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“…The irradiated polymers undergo various complex changes in chemistry [ 2 , 3 , 4 , 5 ]. By varying the irradiation doses and radiation sources, the material properties can be differently influenced, and therefore can be used for different applications connected to the functionalisation of cellulose and lignin [ 6 , 7 , 8 ]. The wood extractives may influence these chemical changes caused by irradiation.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, new interaction between chemical bonds can be generated in cellulose by using ionising radiation [ 8 ] and may lead to enhanced properties of wood and cellulose [ 11 ]. Through the low absorbed dose of the irradiation, the hemicelluloses (polyoses) are altered and can change the material resistance against compression [ 6 ]. Nevertheless, the influence of radiation on wood extractives has not been clarified in detail.…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, the irradiation has been used to functionalise different properties for the enhancement of wood [6,10]. After a low dose of electron beam irradiation of Materials 2021, 14, 1613 2 of 7 wood, the weathering effects were reduced and the colour stabilisation was improved [7].…”

Section: Introductionmentioning

confidence: 99%

“…After a low dose of electron beam irradiation of Materials 2021, 14, 1613 2 of 7 wood, the weathering effects were reduced and the colour stabilisation was improved [7]. Condensation reactions occur within the lignin at low radiation dosages and stabilise the wood matrix against different processes [2,6]. Moreover, new interaction between chemical bonds can be generated in cellulose by using ionising radiation [8] and may lead to enhanced properties of wood and cellulose [11].…”

Section: Introductionmentioning

confidence: 99%

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Changing in Larch Sapwood Extractives Due to Distinct Ionizing Radiation Sources

et al. 2021

Self Cite

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Wood extractives have an influence on different material properties. This study deals with the changes in wood extractives of larch sapwood due to two different low doses of energy irradiations. Electron beam irradiation (EBI) and γ-ray irradiation treatments were done by using two industrial processes. After the different modifications the extractions were performed with an accelerated solvent extractor (ASE) using hexane and acetone/water. The qualitative and quantitative chemical differences of irradiated larch sapwood samples were analysed using gas chromatography–mass spectrometry (GC-MS) and Fourier-transform infrared spectroscopy (FT-IR) vibrational spectroscopy methods. The yields of the quantitative extractions decreased due to the two different irradiation processes. While the compounds extracted with nonpolar solvent from wood were reduced, the number of compounds with polar functionalities increased based on the oxidation process. Quantitatively, resin acids and polyphenols were highly affected when exposed to the two irradiation sources, leading to significant changes (up, down) in their relative amount. Furthermore, two new substances were found in the extracts of larch sapwood samples after EBI or γ-ray treatments. New insight into the different effects of larch sapwood and wood extractives by EBI and γ-ray was gained in this study.

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Using controlled radiolysis of melamine to reinforce melamine‐urea‐formaldehyde resin impregnated wood

2022

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The effect of electron beam (EB) irradiation (0 to 80 kGy) on the mechanical properties of melamine‐urea‐formaldehyde (MUF) impregnated wood prepared from Pinus sylvestris is investigated. The results of the compressive strength parallel to grain measurement demonstrate EB irradiation can enhance the mechanical properties of MUF impregnated wood, with optimal results achieved at 20 kGy. Additionally, the formaldehyde emission of impregnated wood has been significantly reduced. This enhancement is promoted by the dispersibility and crosslinking efficiency of melamine in the dealkylation stage under low‐dose irradiation. However, the deamination and the destruction of triazine ring becomes significant at higher irradiation dosage, resulting in deterioration of mechanical properties as demonstrated by Raman spectroscopy,13C‐NMR, and SEM.

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Changes in mechanical and chemical wood properties by electron beam irradiation

Cited by 23 publications

References 32 publications

Development of highly durable superhydrophobic and UV-resistant wood by E-beam radiation curing

Development of highly durable superhydrophobic and UV-resistant wood by E-beam radiation curing

Changing in Larch Sapwood Extractives Due to Distinct Ionizing Radiation Sources

Using controlled radiolysis of melamine to reinforce melamine‐urea‐formaldehyde resin impregnated wood

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