Effect of walnut shells and silanized walnut shells on the mechanical and thermal properties of rigid polyurethane foams

2020 ◽  
Vol 87 ◽  
pp. 106534 ◽  
Author(s):  
Sylwia Członka ◽  
Anna Strąkowska ◽  
Agnė Kairytė
Keyword(s):  
Thermal Properties ◽  
Polyurethane Foams ◽  
Mechanical And Thermal Properties ◽  
Rigid Polyurethane Foams ◽  
Walnut Shells

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.

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.

Mechanical and Thermal Properties of High-Density Rigid Polyurethane Foams from Renewable Resources

2016 ◽  
Vol 4 (1) ◽  
pp. 86-100 ◽  
Author(s):  
M. Kirpluks ◽  
U. Cabulis ◽  
A. Ivdre ◽  
M. Kuranska ◽  
M. Zieleniewska ◽  
...  
Keyword(s):  
Thermal Properties ◽  
Renewable Resources ◽  
Polyurethane Foams ◽  
High Density ◽  
Mechanical And Thermal Properties ◽  
Rigid Polyurethane Foams

Bio-based Polyurethane-clay Nanocomposite Foams: Systheses and Properties

2009 ◽  
Vol 1188 ◽  
Author(s):  
Min Liu ◽  
Zoran S. Petrovic ◽  
Yijin Xu
Keyword(s):  
Thermal Conductivity ◽  
Thermal Insulation ◽  
Cell Structure ◽  
Polyurethane Foams ◽  
Mechanical And Thermal Properties ◽  
Cell Content ◽  
Modified Clay ◽  
Rigid Polyurethane Foams ◽  
Nanocomposite Foams ◽  
Organically Modified

AbstractStarting from a bio-based polyol through modification of soybean oil, BIOH™ X-210, two series of bio-based polyurethanes-clay nanocomposite foams have been prepared. The effects of organically-modified clay types and loadings on foam morphology, cell structure, and the mechanical and thermal properties of these bio-based polyurethanes-clay nanocomposite foams have been studied with optical microscopy, compression test, thermal conductivity, DMA and TGA characterization. Density of nanocomposite foams decreases with the increase of clay loadings, while reduced 10% compressive stress and yield stress keep constant up to 2.5% clay loading in polyol. The friability of rigid polyurethane-clay nanocomposite foams is high than that of foam without clay, and the friability for nanofoams from Cloisite® 10A is higher than that from 30B at the same clay loadings. The incorporation of clay nanoplatelets decreases the cell size in nanocomposite foams, meanwhile increases the cell density; which would be helpful in terms of improving thermal insulation properties. All the nanocomposite foams were characterized by increased closed cell content compared with the control foam from X-210 without clay, suggesting the potential to improve thermal insulation of rigid polyurethane foams by utilizing organically modified clay. Incorporation of clay into rigid polyurethane foams results in the increase in glass transition temperature: the Tg increased from 186 to 197 to 204 °C when 30B concentration in X-210 increased from 0 to 0.5 to 2.5%, respectively. Even though the thermal conductivity of nanocomposite foams from 30B is lower than or equal to that of rigid polyurethane control foam from X-210, thermal conductivity of nanocomposite foams from 10A is higher than that of control at all 10A concentrations. The reason for this abnormal phenomenon is not clear at this moment; investigation on this is on progress.

Mechanical, morphological, and thermal properties of rigid polyurethane foams blown by distilled water

2003 ◽  
Vol 90 (1) ◽  
pp. 12-21 ◽  
Author(s):  
W. J. Seo ◽  
H. C. Jung ◽  
J. C. Hyun ◽  
W. N. Kim ◽  
Y.-B. Lee ◽  
...  
Keyword(s):  
Thermal Properties ◽  
Polyurethane Foams ◽  
Distilled Water ◽  
Rigid Polyurethane Foams

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

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 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.

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