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Leonovich, A. A.; Kovrizhnykh, L. P.; Korneev, V. I.; Bodoyavlenskaya, G. A.; Медведева, И. Н.

doi:10.1023/a:1020981532085

Cited by 9 publications

(8 citation statements)

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“…Sulfurmodified urea-formaldehyde resins were investigated by Meyer et al [3]. Recent modifications are aimed at increasing water resistance, processing improvement, avoiding self-cure during storage and transportation [4] or lowering formaldehyde emission [5]. A wide spectrum of compounds was applied as modifying-agents: aliphatic amines [6][7][8], dialdehydes [9][10], latexes [11], emulsifiable methylene diphenyl diisocyanate (EMDI) [12]-to name just a few.…”

Section: Introductionmentioning

confidence: 99%

Hyperbranched Polyether as a Modifying Agent for Urea-Formaldehyde Resins—Hardness and Strength Control Tool

Mamiński

Pawlicki

Zado

et al. 2007

International Journal of Polymeric Materials

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A commercially available urea-formaldehyde (UF) resin was blended with a hyperbranched polyether (HBP) obtained from glycerol being a by-product in biodiesel production. The mechanical properties of the cured polymeric blends are described in this article. It was found that low addition (3 wt%) of the modifier significantly improves the hardness (16%) and the compressive shear strength (17%) of the polymer, whereas water absorption remains unaffected. It was also shown that blending UF resins with hyperbranched polyethers can be an effective tool for controlling mechanical properties and dimensional stability of the polymeric systems.

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Section: Introductionmentioning

confidence: 99%

Hyperbranched Polyether as a Modifying Agent for Urea-Formaldehyde Resins—Hardness and Strength Control Tool

Mamiński

Pawlicki

Zado

et al. 2007

International Journal of Polymeric Materials

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“…Ključne riječi: nanoceluloza, mikroceluloza, urea-formaldehidna smola, furnirska ploča, modifikacija the surface of veneers (Leonovich et al, 2002;Lin et al, 2006;Roumeli et al, 2012;Dukarska and Czarnecki, 2016). Recently, it has been revealed that the addition of micro and nano fibres of cellulose may have advantageous effects on the properties of resin.…”

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confidence: 99%

Properties of Plywood Produced with Urea-Formaldehyde Adhesive Modified with Nanocellulose and Microcellulose

et al. 2020

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Urea-formaldehyde adhesives are widely used in the wood-based materials industry. The study investigates the possibility of using cellulosic particles as a filler that modifies the properties of the resin and consequently improves the properties of plywood. Moreover, the study also examines the differences between microcellulose and nanocellulose used as a filler for UF adhesive. Based on the investigations, it was found that the addition of MFC and NCC significantly affected the curing process and rheological behaviour of adhesive mixtures. Modification led to increase of viscosity and extension of a gel time caused by lowering solid content of the resin. The experimental and reference plywood were tested in terms of bonding quality and mechanical properties such as modulus of elasticity and modulus of rigidity in accordance with applicable standards. The results of the tests confirmed that both the amount and the type of modifier added to the resin had a significant effect on the properties of plywood. The bonding quality and the above mentioned mechanical properties improved in all variants of modification; however the most effective was the addition of NCC in the amount of 10 %/100 g of solid resin. The slight decrease of formaldehyde emission was only observed for 5 % cellulosic particles added to 100 g of solid UF.

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“…Naturally, when tension perpendicular to the PB plan, the sample breaks in an area in which the number of small particles is minor. This kind of destruction is predicted by formulas (4), ( 5) and (9). Nevertheless, the following more detailed analysis of the experimental data is required.…”

Section: S Tmentioning

confidence: 87%

“…In some cases, particles with a coefficient φ≈1 are effective; in other cases particles with a coefficient φ≈0.05 may be more effective. The influence of particles of a certain shape and size depends on their mass fraction and is determined by the coefficients C̃i new and C̃i old in formula (9). It is pertinent to note as a side note that the relationship between the length and thickness of a particular member, called the "slenderness ratio", is one of the key characteristics used in engineering calculations (e.g.…”

Section: Figure 8: Influence Of Particle Size a 2 New On The Relative Number Of Adhesive Contactsmentioning

confidence: 99%

See 1 more Smart Citation

The effect of the size and shape of wood particles on the tensile strength perpendicular to the plane of the particleboard: Experiments and modeling

Borisovich¹,

Gennadievich²,

Anatolyevna³

et al. 2021

J Appl Eng Science

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One of the problems of sustainable development is the technologies improvement for the rational use of wood and other raw materials of plant origin. The literature reflects a large amount of applied research that was conducted to justify new technologies for the production of particle boards (PB). The main attention in the known works is paid to the influence of the particle size distribution on the strength of PB. The influence of particle shape on the PB strength has been studied to a lesser extent. In this regard, this article considers the influence of the shape and size of particles on the tensile strength perpendicular to the plane of the PB. A geometric analysis of the particle shape is performed. It was taken into account that the PB strength depends on the shape and size of the particles, as well as on the number of adhesive contacts between particles. To obtain quantitative estimates, formulas were substantiated confirming that an increase in the length of the particles and a decrease in their transverse dimensions lead to an increase in the PB strength. Experimental research methods were used, and mathematical modeling of the sample failure area was performed.

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Cited by 9 publications

References 0 publications

Hyperbranched Polyether as a Modifying Agent for Urea-Formaldehyde Resins—Hardness and Strength Control Tool

Hyperbranched Polyether as a Modifying Agent for Urea-Formaldehyde Resins—Hardness and Strength Control Tool

Properties of Plywood Produced with Urea-Formaldehyde Adhesive Modified with Nanocellulose and Microcellulose

The effect of the size and shape of wood particles on the tensile strength perpendicular to the plane of the particleboard: Experiments and modeling

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