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Journal ArticleDOI: 10.1080/17480272.2019.1626480

Effect of blowing agent concentration on rigid polyurethane foam and the properties of foam-core particleboard

04 Mar 2021-Wood Material Science and Engineering (Taylor & Francis)-Vol. 16, Iss: 2, pp 85-93
Abstract: In this research, a sandwich panel with particleboard as surface layers and rigid polyurethane (PU) foam as core layers (foam-core particleboard) was produced with a one-step in situ foaming proces...

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Topics: Sandwich panel (58%), Blowing agent (55%), Core (manufacturing) (52%)
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6 results found


Journal ArticleDOI: 10.1177/0954406220971667
Quanjin Ma1, Quanjin Ma2, M.R.M. Rejab1, M.R.M. Rejab2  +4 moreInstitutions (6)
01 Oct 2021-
Abstract: The present research work is aimed to investigate the effect of infill pattern, density and material types of 3D printed cubes under quasi-static axial compressive loading. The proposed samples wer...

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Topics: Quasistatic loading (55%), Infill (51%)

4 Citations


Journal ArticleDOI: 10.1080/17480272.2020.1847187
Abstract: This study was aimed to evaluate the position of lightweight panels and their application in furniture production in Iran by investigating consumers’ behavior and preferences. Here, consumers’ preferences toward effective criteria to choose furniture made of wood-based panels (WBPs) were evaluated on the basis of analytical network process method. Furthermore, respondents were asked about their attitudes and preferences regarding lightweight furniture. The results revealed that the main sub-criteria for buying furniture were product quality, design, price, environmentally-friendly, and guarantee features. Furthermore, the technological feature was the most important criterion affecting consumers buying decisions more than the visual/appearance and economical features of the furniture. Consumers believed that conventional WBPs were heavy for some applications in the furniture. Respondents emphasized that they would buy lightweight furniture, even with a bit more price (5–9%) in comparison to conventional furniture (furniture made of WBPs) if there would be a product guarantee, more varieties of the products available in the market, and environmentally-friendly certification. In general, the consumers showed a willingness to buy furniture made by panels with mid-range density (480 kg/m3 density), but they should have to be sure of the panels’ quality and the furniture made thereof before buying this product.

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2 Citations


Open accessJournal ArticleDOI: 10.3390/IJMS22168981
Abstract: The aim of the presented research was to obtain two new eco-polyols based on waste polylactide (PLA) and to check the effect on the properties of rigid polyurethane (RPU) foams and, based on these, rigid polyurethane/polyisocyanurate (RPU/PIR) foams. The synthesis of eco-polyols was based on the transesterification reaction of melted PLA with diethylene glycol in the presence of an organometallic catalyst. Properties of the obtained eco-polyols were examined for their potential as raw materials for synthesis of rigid polyurethane and polyisocyanurate foams, i.e., hydroxyl value, acid value, density, viscosity, pH, water content. Spectroscopic studies (FTIR, 1H NMR and 13C NMR) were also carried out. Results of these tests confirmed the assumed chemical structure of the new polyols. RPU and RPU/PIR foam formulations were developed based on the obtained analytical results. Partial replacement of petrochemical polyol by eco-polyols in RPU and RPU/PIR foams decreased the value of apparent density, compressive strength, brittleness and water absorption. Moreover, all foams modified by eco-polyols showed higher resistance to aging. All RPU/PIR foams and most PRU foams modified by eco-polyols from waste PLA had better functional properties than the reference foams based on petrochemical polyol.

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Topics: Polyisocyanurate (61%), Polyurethane (54%)

1 Citations



Journal ArticleDOI: 10.1021/ACSAPM.1C01081
14 Oct 2021-
Abstract: Native lignin, a major structural polymer in lignocellulosic biomass, offers unique advantages as a feedstock for high-performance bio-based polymeric materials. In this work, depolymerized native ...

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Topics: Lignocellulosic biomass (58%)

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18 results found


Open accessBook
31 Aug 2007-

392 Citations


Journal ArticleDOI: 10.1002/APP.27712
M. Thirumal1, Dipak Khastgir1, Nikhil K. Singha1, B. S. Manjunath  +1 moreInstitutions (1)
Abstract: Density is an important parameter that influences the properties and performances of rigid polyurethane foam (PUF). Rigid PUF with different densities were prepared by varying the amount of distilled water as blowing agent. This investigation reports the mechanical, morphological, water absorption, thermal conductivity, and thermal behavior of rigid PUF varying with the density, which controls the foam architecture. The density of the PUF decreased from 116 to 42 kg/m3 with an increase in the amount of water from 0.1 to 3.0 parts per hundred polyol by weight (phr), respectively. It was found that the mechanical properties of the PUFs changed with the foam density. The results of water absorption of the PUFs showed that water absorption increased with decrease in density, due to increase in the cell size and decrease in the cell-wall thickness. The thermal conductivity measurements showed that the thermal conductivity decreased with increase in density. It was due to the decrease in cell size. The thermal analysis of the PUFs shows that the glass transition temperature increases with the decrease in foam density, but the thermal stability decreases with the decrease in foam density. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008

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Topics: Absorption of water (54%), Thermal stability (52%), Blowing agent (51%)

230 Citations


Journal ArticleDOI: 10.1016/S1359-835X(96)00098-X
Kicki F. Karlsson1, B. TomasÅström1Institutions (1)
Abstract: Techniques to manufacture sandwich components for structural applications are summarized and discussed in terms of processing steps, characteristics of both technique and manufactured components, and application examples. The emphasis is on the commercially most common manufacturing techniques, though less common processing routes are briefly discussed as well. The intentions of this review are twofold: first, the paper aims to provide a means of comparing available manufacturing techniques in terms of feasibility for a specific application; second, the paper aims to provide a baseline for further research and development efforts in the field of sandwich manufacture. A discussion of recent developments and future trends in terms of both materials and processing routes rounds up the paper.

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225 Citations


Journal ArticleDOI: 10.1016/J.MATCHEMPHYS.2011.04.008
Abstract: Rigid polyurethane foam (PUF) was prepared by the reaction of bio-polyol prepared from liquefied sugar-cane bagasse (LBP) with commercial methylene diphenyl diisocyanate (MDI) and polyethylene glycol in the presence of N,N-dimethylcyclohexylamine as a catalyst, water as a chemical blowing agent, and silicon oil as a surfactant. The effect of partial replacement of polyethylene glycol polyol (PEG) by the prepared bio polyol on physical, mechanical, thermal conductivity, and thermal stability of polyurethane foam was studied. The obtained results revealed that, the prepared polyurethane foam showed longer cream and tack free times more than blank polyurethane foam (100% PEG). The foam density and compressive strength improved with increasing of biomass-based polyol content. Increasing the percents of bio polyol more than 30% replacement resulted in heterogeneous surface and irregular pore shape. Also thermal conductivity reduced from 0.035 to 0.029 with increasing bio polyol content. Polyurethane foam additives such as blowing agent, catalyst, and surfactant content effects on polyurethane foam properties were studied.

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Topics: Methylene diphenyl diisocyanate (60%), Polyurethane (60%), Polyol (56%) ... read more

132 Citations


Open accessBook
17 Nov 2014-

94 Citations


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