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

Effect of multi-walled carbon nanotubes with different diameters on morphology and thermal and mechanical properties of flexible polyurethane foams

2021 ◽  
pp. 026248932110172
Author(s):  
Fukai Yang ◽  
Miao Xie ◽  
Zhang Yudi ◽  
Xinyu Xu
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
In Situ Polymerization ◽  
Loss Modulus ◽  
Polyurethane Foams ◽  
The Matrix ◽  
Multi Walled Carbon Nanotubes ◽  
Different Diameters ◽  
Flexible Polyurethane ◽  
Walled Carbon Nanotubes

We report flexible polyurethane foams (PUFs) containing –OH functionalized multi-walled carbon nanotubes (MWCNTs) with different diameters (10–20 nm, 20–30 nm, >50 nm) from 0.1–0.6 wt% (per 100 resins of polyol by weight) prepared via in situ polymerization. After synthesis, the morphology of the MWCNT/PUF composites was observed through scanning electron microscopy (SEM) based on MWCNT amount. The MWCNTs acted as nucleating agents and increased the matrix viscosity. The pore size of the composites decreased and the number of pores increased with increasing MWCNT concentration. Dynamic mechanical analysis (DMA) showed that the storage modulus of the composites increased, the loss modulus decreased, and the Tg gradually decreased with increasing MWCNT content. The incorporation of MWCNTs induced remarkable thermal stabilization of the matrix. The increase in the degradation temperature from 294°C to 304°C resulted in a 50% weight loss. The mechanical properties of the MWCNT/PUF materials increased with increasing MWCNT proportion because of the excellent compatibility and strong interface interaction between the MWCNT and flexible PUF.

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

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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