scholarly journals Bio-Degradable Polyurethane Foams Produced by Liquefied Polyol from Wheat Straw Biomass

Polymers ◽  
2020 ◽  
Vol 12 (11) ◽  
pp. 2646
Author(s):  
Luis Serrano ◽  
Esther Rincón ◽  
Araceli García ◽  
Jesús Rodríguez ◽  
Rodrigo Briones
Keyword(s):  
Thermal Properties ◽  
Wheat Straw ◽  
Castor Oil ◽  
Polyurethane Foams ◽  
Mechanical And Thermal Properties ◽  
Ordered Structure ◽  
Methylene Diphenyl Diisocyanate ◽  
Agricultural Applications ◽  
Soil Media ◽  
Wheat Straw Biomass

In the present work, an abundant and unused residue (wheat straw) has been employed to synthesize a polyol as a substituent of castor oil in polyurethane foams. The liquefied product showed excellent properties for the proposed application. Castor oil was substituted with up to 50% wheat straw polyol in the formulation of polyurethane foams, which were prepared using two different isocyanates (methylene diphenyl diisocyanate (MDI) and toluene-2,4-diisocyanate (TDI)). The evaluation of physical, mechanical, and thermal properties of the foams revealed that these materials can successfully be formed with up to 40% wheat straw polyols since all the results were improved. Moreover, at this polyol concentration, the morphology of the foams was presented as a compact and ordered structure. Following this trend, the foams showed excellent biodegradability at 30 days (5.60 and 7.31% for TDI and MDI foams, respectively) and 60 days (8.49 and 9.88% for TDI and MDI foams, respectively) in the soil media tests carried out. Thus, the materials prepared in this work can be proposed for agricultural applications such as use in plant nurseries.

scholarly journals Effect of ground tire rubber on structural, mechanical and thermal properties of flexible polyurethane foams

2014 ◽  
Vol 24 (1) ◽  
pp. 75-84 ◽  
Author(s):  
Łukasz Piszczyk ◽  
Aleksander Hejna ◽  
Krzysztof Formela ◽  
Magdalena Danowska ◽  
Michał Strankowski
Keyword(s):  
Thermal Properties ◽  
Polyurethane Foams ◽  
Mechanical And Thermal Properties ◽  
Tire Rubber ◽  
Ground Tire Rubber ◽  
Flexible Polyurethane

scholarly journals Composites of Rigid Polyurethane Foams Reinforced with POSS

Polymers ◽  
2019 ◽  
Vol 11 (2) ◽  
pp. 336 ◽  
Author(s):  
Sylwia Członka ◽  
Anna Strąkowska ◽  
Krzysztof Strzelec ◽  
Agnieszka Adamus-Włodarczyk ◽  
Agnė Kairytė ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Thermal Properties ◽  
Water Absorption ◽  
Viscoelastic Behavior ◽  
Physical And Mechanical Properties ◽  
Polyurethane Foams ◽  
Bending Test ◽  
Mechanical And Thermal Properties ◽  
Rigid Polyurethane Foams ◽  
Cell Shapes

Rigid polyurethane foams (RPUFs) were successfully modified with different weight ratios (0.5 wt%, 1.5 wt% and 5 wt%) of APIB-POSS and AEAPIB-POSS. The resulting foams were evaluated by their processing parameters, morphology (Scanning Electron Microscopy analysis, SEM), mechanical properties (compressive test, three-point bending test and impact strength), viscoelastic behavior (Dynamic Mechanical Analysis, DMA), thermal properties (Thermogravimetric Analysis, TGA, and thermal conductivity) and application properties (contact angle, water absorption and dimensional analysis). The results showed that the morphology of modified foams is significantly affected by the type of the filler and filler content, which resulted in inhomogeneous, irregular, large cell shapes and further affected the physical and mechanical properties of resulting materials. RPUFs modified with APIB-POSS represent better mechanical and thermal properties compared to the RPUFs modified with AEAPIB-POSS. The results showed that the best results were obtained for RPUFs modified with 0.5 wt% of APIB-POSS. For example, in comparison with unfilled foam, compositions modified with 0.5 wt% of APIB-POSS provide greater compression strength, better flexural strength and lower water absorption.

Electrical conductivity and major mechanical and thermal properties of carbon nanotube-filled polyurethane foams

2011 ◽  
Vol 120 (5) ◽  
pp. 3014-3019 ◽  
Author(s):  
Ding-Xiang Yan ◽  
Kun Dai ◽  
Zhi-Dong Xiang ◽  
Zhong-Ming Li ◽  
Xu Ji ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Thermal Properties ◽  
Carbon Nanotube ◽  
Polyurethane Foams ◽  
Mechanical And Thermal Properties

scholarly journals Synthesis and Characterization of Polyurethane-Nanoclay Composites

2013 ◽  
Vol 2013 ◽  
pp. 1-5 ◽  
Author(s):  
Manasa Nayani ◽  
Subhashini Gunashekar ◽  
Nidal Abu-Zahra
Keyword(s):  
Thermal Properties ◽  
Cell Structure ◽  
Thermoplastic Polyurethane ◽  
Mechanical And Thermal Properties ◽  
Composite Foam ◽  
Weight Percentage ◽  
Nanocomposite Foams ◽  
Methylene Diphenyl Diisocyanate ◽  
Closed Mold

In this study polyurethane (PUR)-nanoclay composites were synthesized using methylene diphenyl diisocyanate, polyol, and hectorite clay. The weight percentage of hectorite clay was varied at three different levels to study its effect on the properties of the thermoplastic polyurethane nanocomposite. The nanocomposite polyurethane foam was synthesized in a 2-step reaction process. The first step involved the addition and dispersion of nanoclay into the isocyanate. The mixture was then mixed with the polyol, and the foam was cast in a preheated closed mold. The PUR-nanocomposite foams were analyzed for cell structure, physical, mechanical, and thermal properties. The composite foam showed significant increase in tensile and flexural strengths, abrasion resistance, and thermal properties.

scholarly journals Physical Properties of Soy-Phosphate Polyol-Based Rigid Polyurethane Foams

2012 ◽  
Vol 2012 ◽  
pp. 1-8 ◽  
Author(s):  
Hongyu Fan ◽  
Ali Tekeei ◽  
Galen J. Suppes ◽  
Fu-Hung Hsieh
Keyword(s):  
Thermal Conductivity ◽  
Compressive Strength ◽  
Thermal Properties ◽  
Water Content ◽  
Polyurethane Foams ◽  
Solid Polymer ◽  
Mechanical And Thermal Properties ◽  
Blowing Agent ◽  
Isocyanate Index ◽  
Pu Foams

Water-blown rigid polyurethane (PU) foams were made from 0–50% soy-phosphate polyol (SPP) and 2–4% water as the blowing agent. The mechanical and thermal properties of these SPP-based PU foams (SPP PU foams) were investigated. SPP PU foams with higher water content had greater volume, lower density, and compressive strength. SPP PU foams with 3% water content and 20% SPP had the lowest thermal conductivity. The thermal conductivity of SPP PU foams decreased and then increased with increasing SPP percentage, resulting from the combined effects of thermal properties of the gas and solid polymer phases. Higher isocyanate density led to higher compressive strength. At the same isocyanate index, the compressive strength of some 20% SPP foams was close or similar to the control foams made from VORANOL 490.

Studies of the Influence of Graphite on the Physical Mechanical and Thermal Properties of Polyurethane Foams for Construction Applications

2021 ◽  
Vol 887 ◽  
pp. 399-405
Author(s):  
L.N. Shafigullin ◽  
N.V. Romanova ◽  
G.R. Shafigullina
Keyword(s):  
Thermal Conductivity ◽  
Thermal Properties ◽  
Absorption Coefficient ◽  
Sound Absorption ◽  
Polyurethane Foams ◽  
Onset Temperature ◽  
Sound Absorption Coefficient ◽  
Expandable Graphite ◽  
Mechanical And Thermal Properties ◽  
Pu Foam

The paper shows the applicability of expandable graphite METOPAC EG 350-50 (80) in a rigid PU foam system as a substance that reduces the flammability (flame retardant) and improves the usability. The studies of the physical mechanical and thermal properties of PU foam with a higher graphite content revealed a higher normal sound absorption coefficient; insignificant influence on the thermal conductivity; a higher decomposition onset temperature; more difficult ignition. PU foam sample with a ratio of 15 graphite weight fractions to 100 polyol weight fractions has the highest physical mechanical and thermal properties, and, as compared to the starting PU foam, it features an increase in normal sound absorption coefficient by an average of 3 times; a decrease in the thermal conductivity by 8 %; an increase in the decomposition onset temperature by 6.7 °С. Therefore, the modification of PU foam with expandable graphite makes it possible not only to develop hardly combustible polyurethanes but also to improve its physical mechanical and thermal properties.

Colored polyurethane foams with enhanced mechanical and thermal properties

2019 ◽  
Vol 78 ◽  
pp. 105986 ◽  
Author(s):  
Sylwia Członka ◽  
Natalia Sienkiewicz ◽  
Agnė Kairytė ◽  
Saulius Vaitkus
Keyword(s):  
Thermal Properties ◽  
Polyurethane Foams ◽  
Mechanical And Thermal Properties

scholarly journals Anti-flammability, mechanical and thermal properties of bio-based rigid polyurethane foams with the addition of flame retardants

RSC Advances ◽  
2020 ◽  
Vol 10 (53) ◽  
pp. 32156-32161
Author(s):  
Guangyu Zhang ◽  
Xiaoqi Lin ◽  
Qinqin Zhang ◽  
Kaisen Jiang ◽  
Weisheng Chen ◽  
...  
Keyword(s):  
Thermal Properties ◽  
Flame Retardant ◽  
Flame Retardants ◽  
Polyurethane Foams ◽  
Mechanical And Thermal Properties ◽  
Rigid Polyurethane Foams ◽  
Flame Retardant Properties

Bio-based rigid polyurethane foams with the addition of flame retardant exhibit preferable flame-retardant properties.

Preparation and Characterization of Polyurethane Foams from Modified Rosin-Based Polyether Polyol

2014 ◽  
Vol 887-888 ◽  
pp. 727-730
Author(s):  
Meng Zhang ◽  
Li Qiang Zhang ◽  
Yong Hong Zhou
Keyword(s):  
Thermal Stability ◽  
Thermal Properties ◽  
Compression Strength ◽  
Dimensional Stability ◽  
Polyurethane Foams ◽  
Mechanical And Thermal Properties ◽  
Foaming Behavior ◽  
Polyether Polyol ◽  
Better Than

Rosin based polyether polyols were synthesized from rosin formaldehyde adduct, propylene epoxide and ethylene epoxide in the presence of catalyst. Rigid polyurethane foams (PUFs) were prepared with these rosin-based polyols and compared with foam made with an industrial polyether polyol (TC-4110) and rosin-based polyester polyols. The mechanical and thermal properties of foams were analyzed by some methods. The experimental results show that the foaming behavior for the foams prepared from such rosin based polyether polyols is similar to that of industrial products, but the reaction activities were higher, the viscosities are much lower. Furthermore, their 10% compression strength and thermal stability were higher and the dimensional stability is similar or somewhat better than that of TC-4110 system. All these unique properties of rigid PUFs made with rosin based polyether polyols were more suitable for as industrial production.

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