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

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.

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

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 Viscoelastic Polyurethane Foams for Use as Auxiliary Materials in Orthopedics

Materials ◽  
2021 ◽  
Vol 15 (1) ◽  
pp. 133
Author(s):  
Dominik Grzęda ◽  
Grzegorz Węgrzyk ◽  
Milena Leszczyńska ◽  
Leonard Szczepkowski ◽  
Michał Gloc ◽  
...  
Keyword(s):  
Water Content ◽  
Recovery Time ◽  
Permanent Deformation ◽  
Skin Irritation ◽  
Polyurethane Foams ◽  
Residual Limb ◽  
Scanning Calorimetry ◽  
Excessive Sweating ◽  
Isocyanate Index ◽  
Scanning Electron

One of the essential factors in prostheses is their fitting. To assemble a prosthesis with the residual limb, so-called liners are used. Liners used currently are criticized by users for their lack of comfort, causing excessive sweating and skin irritation. The objective of the work was to develop viscoelastic polyurethane foams for use in limb prostheses. As part of the work, foams were produced with different isocyanate indexes (0.6–0.9) and water content (1, 2 and 3 php). The produced foams were characterized by scanning electron microscopy, computer microtomography, infrared spectroscopy, thermogravimetry and differential scanning calorimetry. Measurements also included apparent density, recovery time, rebound elasticity, permanent deformation, compressive stress value and sweat absorption. The results were discussed in the context of modifying the foam recipe. The performance properties of the foams, such as recovery time, hardness, resilience and sweat absorption, indicate that foams that will be suitable for prosthetic applications are foams with a water content of 2 php produced with an isocyanate index of 0.8 and 0.9.

In situ monitoring of isophorone diisocyanate-based flexible polyurethane foams formation

2016 ◽  
Vol 54 (1) ◽  
pp. 37-52 ◽  
Author(s):  
I Eceiza ◽  
L Irusta ◽  
A Barrio ◽  
MJ Fernández-Berridi
Keyword(s):  
Foam Height ◽  
Polyurethane Foams ◽  
In Situ Monitoring ◽  
Generation Process ◽  
Isophorone Diisocyanate ◽  
Experimental Conditions ◽  
Foaming Process ◽  
Foam Generation ◽  
Flexible Polyurethane

Novel isophorone diisocyanate-based flexible polyurethane foams were prepared by the one-step method in a computerized foam qualification system (FOAMAT). The experimental conditions to obtain this type of foams, in relation to the nature and concentration of catalysts as well as the reaction temperature, were established as no data were available in scientific literature. The chemical reactions occurring during the foam generation process were monitored in situ by attenuated total reflectance-FTIR spectroscopy. The kinetics of the foam generation was fitted to an nth order model and the data showed that the foaming process adjusted to a first-order kinetics. The physical changes as pressure, foam height, and dielectric polarization were monitored by the FOAM software (FOAMAT). According to these parameters, the foaming process was divided into four steps: bubble growth, bubble packing, cell opening, and final curing.

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