Soundproofing flexible polyurethane foams: The impact of polyester chemical structure on the microphase separation and acoustic damping

2018 ◽  
Vol 135 (46) ◽  
pp. 46744 ◽  
Author(s):  
Sahar Abdollahi Baghban ◽  
Manouchehr Khorasani ◽  
Gity Mir Mohamad Sadeghi
Keyword(s):  
Chemical Structure ◽  
Microphase Separation ◽  
Polyurethane Foams ◽  
Acoustic Damping ◽  
Flexible Polyurethane ◽  
The Impact

Enhanced acoustic damping in flexible polyurethane foams filled with carbon nanotubes

2009 ◽  
Vol 69 (10) ◽  
pp. 1564-1569 ◽  
Author(s):  
R. Verdejo ◽  
R. Stämpfli ◽  
M. Alvarez-Lainez ◽  
S. Mourad ◽  
M.A. Rodriguez-Perez ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Polyurethane Foams ◽  
Acoustic Damping ◽  
Flexible Polyurethane

Acoustic damping flexible polyurethane foams: Effect of isocyanate index and water content on the soundproofing

2018 ◽  
Vol 136 (15) ◽  
pp. 47363 ◽  
Author(s):  
Sahar Abdollahi Baghban ◽  
Manouchehr Khorasani ◽  
Gity Mir Mohamad Sadeghi
Keyword(s):  
Water Content ◽  
Polyurethane Foams ◽  
Acoustic Damping ◽  
Isocyanate Index ◽  
Flexible Polyurethane

Vibration and Acoustic Damping of Flexible Polyurethane Foams Modified with a Hyperbranched Polymer

2009 ◽  
Vol 46 (1) ◽  
pp. 73-93 ◽  
Author(s):  
Anna Andersson ◽  
Stefan Lundmark ◽  
Anders Magnusson ◽  
Frans H.J. Maurer
Keyword(s):  
Hyperbranched Polymer ◽  
Polyurethane Foams ◽  
Acoustic Damping ◽  
Flexible Polyurethane

scholarly journals Investigation of Flame Retardant Flexible Polyurethane Foams Containing DOPO Immobilized Titanium Dioxide Nanoparticles

Polymers ◽  
2019 ◽  
Vol 11 (1) ◽  
pp. 75 ◽  
Author(s):  
Quanxiao Dong ◽  
Keyu Chen ◽  
Xiaodong Jin ◽  
Shibing Sun ◽  
Yingliang Tian ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Heat Release ◽  
Chemical Structure ◽  
Titanium Dioxide Nanoparticles ◽  
Polyurethane Foams ◽  
Fire Performance ◽  
Transmission Electron ◽  
Peak Heat Release Rate ◽  
Microscale Combustion Calorimetry ◽  
Flexible Polyurethane

In this work, a multi-functional nanoparticle (TiO2-KH570-DOPO) has been successfully synthesized through the attachment of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO)-methacryloxy propyl trimethoxyl silane on the surface of titanium dioxide (TiO2). Supercritical carbon dioxide was used as the solvent in order to increase the grafting level. The chemical structure of TiO2-KH570-DOPO was fully characterized using Fourier transform infrared spectra, thermogravimetric analysis and transmission electron microscopy. The modified TiO2 was incorporated into flexible polyurethane foam (FPUF). The fire performance of FPUF blends was evaluated using microscale combustion calorimetry. Peak heat release rate and total heat release values were reduced from 657.0 W/g and 28.9 kJ/g for neat FPUF sample to 519.2 W/g and 26.8 kJ/g of FPUF specimen containing 10 wt % of TiO2-KH570-DOPO. Analysis of thermal stability and the observation of char formation suggests that TiO2-KH570-DOPO is active in the condensed phase.

Soundproofing flexible polyurethane foams: Effect of chemical structure of chain extenders on micro-phase separation and acoustic damping

2019 ◽  
Vol 56 (2) ◽  
pp. 167-185 ◽  
Author(s):  
Sahar Abdollahi Baghban ◽  
Manouchehr Khorasani ◽  
Gity Mir Mohamad Sadeghi
Keyword(s):  
Compressive Strength ◽  
Phase Separation ◽  
Sound Absorption ◽  
Chemical Structure ◽  
Acoustic Properties ◽  
Average Cell ◽  
Acoustic Damping ◽  
Amine Content ◽  
Chain Extenders ◽  
Flexible Polyurethane

In this study, a new high-performance acoustic damping flexible polyurethane foam (FPUF) was successfully designed and fabricated using synthesized linear saturated aliphatic polyester resin as polyol, methylene diphenyl diisocyanate, and ethylene glycol, monoethanolamine, and ethylenediamine as chain extenders and other reagents by one-shot bulk polymerization (isocyanate index = 100 and water content = 2.5%). The effect of the chemical structure of different chain extenders on micro-phase separation and acoustic damping properties of FPUFs were investigated using comprehensive characterization techniques such as atomic force microscopy (AFM), Fourier transform infrared spectroscopy (FT-IR), compressive strength, optical microscope, and‏ ‏impedance tube. It was indicated that the micro-phase separation degree of the FPUF matrix increased with increasing amine content in the chain extender structure due to the more bidentate hydrogen bondings formation between urea-urea groups. Also, by increasing micro-phase separation, average cell sizes decreased and compressive strength, open-cell contents%, cell walls roughness, and cell size distribution of FPUFs increased. According to the sound absorption spectra, it was found that sound absorption efficiency of FPUF containing DEA was higher than FPUF manufactured by EG by 13.23% in the range of 1500–4000 Hz due to the increase of the amine content of chain extenders. These results indicate that the acoustic properties of FPUFs can be explained with the synergistic actions of micro-phase separation including the viscoelastic behavior of hard-soft segments and increasing of airflow pathway leading to dissipating of the kinetic energy of sound waves. Finally, the results revealed that soundproofing FPUFs with an optimum condition for micro-phase separation and drainage flow can be a promising candidate for using as sound insulating materials in transportation industries such as airplanes, trains, etc.

Preparation and Characterization of Soybean Oil-based Flame Retardant Rigid Polyurethane Foams Containing Phosphaphenanthrene Groups

2020 ◽  
Vol 17 (10) ◽  
pp. 760-771
Author(s):  
Qirui Gong ◽  
Niangui Wang ◽  
Kaibo Zhang ◽  
Shizhao Huang ◽  
Yuhan Wang
Keyword(s):  
Soybean Oil ◽  
Flame Retardant ◽  
Chemical Structure ◽  
Cell Structure ◽  
Polyurethane Foams ◽  
Limiting Oxygen Index ◽  
Rigid Polyurethane Foams ◽  
Degradation Activation Energy ◽  
Ft Ir

A phosphaphenanthrene groups containing soybean oil based polyol (DSBP) was synthesized by epoxidized soybean oil (ESO) and 9,10-dihydro-oxa-10-phosphaphenanthrene-10-oxide (DOPO). Soybean oil based polyol (HSBP) was synthesized by ESO and H2O. The chemical structure of DSBP and HSBP were characterized with FT-IR and 1H NMR. The corresponding rigid polyurethane foams (RPUFs) were prepared by mixing DSBP with HSBP. The results revealed apparent density and compression strength of RPUFs decreased with increasing the DSBP content. The cell structure of RPUFs was examined by scanning electron microscope (SEM) which displayed the cells as spherical or polyhedral. The thermal degradation and flame retardancy of RPUFs were investigated by thermogravimetric analysis, limiting oxygen index (LOI), and UL 94 vertical burning test. The degradation activation energy (Ea) of first degradation stage reduced from 80.05 kJ/mol to 37.84 kJ/mol with 80 wt% DSBP. The RUPF with 80 wt% DSBP achieved UL94 V-0 rating and LOI 28.3. The results showed that the flame retardant effect was mainly in both gas phase and condensed phase.

scholarly journals Effects of Various Types of Expandable Graphite and Blackcurrant Pomace on the Properties of Viscoelastic Polyurethane Foams

Materials ◽  
2021 ◽  
Vol 14 (7) ◽  
pp. 1801
Author(s):  
Rafał Oliwa ◽  
Joanna Ryszkowska ◽  
Mariusz Oleksy ◽  
Monika Auguścik-Królikowska ◽  
Małgorzata Gzik ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Chemical Structure ◽  
Oxygen Index ◽  
Polyurethane Foams ◽  
Expandable Graphite ◽  
Ftir Analysis ◽  
Limiting Oxygen Index ◽  
Peak Heat Release Rate ◽  
Physical And Chemical ◽  
Scanning Electron

We investigated the effect of the type and amount of expandable graphite (EG) and blackcurrant pomace (BCP) on the flammability, thermal stability, mechanical properties, physical, and chemical structure of viscoelastic polyurethane foams (VEF). For this purpose, the polyurethane foams containing EG, BCP, and EG with BCP were obtained. The content of EG varied in the range of 3–15 per hundred polyols (php), while the BCP content was 30 php. Based on the obtained results, it was found that the additional introduction of BCPs into EG-containing composites allows for an additive effect in improving the functional properties of viscoelastic polyurethane foams. As a result, the composite containing 30 php of BCP and 15 php of EG with the largest particle size and expanded volume shows the largest change in the studied parameters (hardness (H) = 2.65 kPa (+16.2%), limiting oxygen index (LOI) = 26% (+44.4%), and peak heat release rate (pHRR) = 15.5 kW/m2 (−87.4%)). In addition, this composite was characterized by the highest char yield (m600 = 17.9% (+44.1%)). In turn, the change in mechanical properties is related to a change in the physical and chemical structure of the foams as indicated by scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR) analysis.

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