New polyurethane foams modified with cellulose derivatives

Rivera‐Armenta, José Luis; Heinze, Thomas; Mendoza-Martínez, Ana María

doi:10.1016/j.eurpolymj.2004.07.015

Cited by 116 publications

(96 citation statements)

References 15 publications

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“…Other characteristic bands, the NH deformation signal around 1523 cm -1 of isocyanurate (resulting from reactions between isocyanate and urethane groups) [25], aromatic ester stretching at 1216 and 1064 cm -1 and CH deformations of aromatic groups in the range of 800 to 600 cm -1 are also noted in the spectrum. The presence of a large signal at 2258 cm -1 indicates that residual (unreacted) isocyanate still exists in the system [26], which was expected since an isocyanate index equal to 1.10 was used in the foam formulation. The production foams from PG2m and PG2.52m, were used cyclopentane, dichloroethane and water as a main, secondary and co-blowing agents, respectively.…”

Section: Structure and Materials Forms Of Glycolysis Productsmentioning

confidence: 98%

Characterization of Rigid Polyurethane Foam Prepared from Recycling of PET Waste

Ghaderian¹,

Haghighi²,

Taromi³

et al. 2015

Period. Polytech. Chem. Eng.

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Section: Structure and Materials Forms Of Glycolysis Productsmentioning

confidence: 98%

Characterization of Rigid Polyurethane Foam Prepared from Recycling of PET Waste

Ghaderian¹,

Haghighi²,

Taromi³

et al. 2015

Period. Polytech. Chem. Eng.

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“…Tan d is the measurement of internal friction, and the curves of tan d allow the T g values to be determined. Obtaining the glass transition temperature from the tan d curves is the most common technique [22,23]. The foam with added EG had the highest T g value.…”

Section: Dmamentioning

confidence: 99%

“…Typical peaks observed in polyurethanes are discussed below. The peak at 3296.8 cm -1 is assigned to the N-H stretching vibrations [19,[23][24][25][26][27]. The peaks at 2971 and 2867 cm -1 are from the asymmetric and symmetric stretching vibrations of CH 2 , respectively [2,19,24].…”

Section: Ft-irmentioning

confidence: 99%

Thermal and mechanical behaviour of flexible polyurethane foams modified with graphite and phosphorous fillers

2012

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Flexible polyurethane foams (FPF) are polymer materials that have high flammability. Fyrol PNX (FPNX) and expandable graphite (EG), have been used to modify the properties of these materials. The aim of this study was to assess the possibility of improving the thermal stability and flame retardancy of FPF by the addition of FPNX and EG fillers. The prepared foams were characterised by their apparent density, hardness, flexibility, irreversible strain and linear flammability, as well as thermogravimetric analysis (TGA), dynamic mechanical analysis, Fourier transform infrared spectroscopy (FT-IR) and pyrolysis combustion flow calorimetry (PCFC) measurements. The apparent density, hardness, flexibility and irreversible strain results showed that the addition of graphite and phosphorous fillers to the FPF makes slight changes to the mechanical properties, which remain within the acceptable norms. It was also observed that reducing the amount of Fyrol PNX and replacing it with the same amount of EG allowed similar values of linear flammability to be obtained with a simultaneous increase in thermal stability, as shown in the TGA study and the PCFC test. Moreover, it was found that the modification of flexible polyurethane foam by the addition of a mixture of FPNX and EG fillers allows the best properties of this type of materials to be obtained. This result indicates that this type of modification could be an effective way to improve the thermal stability of FPF.

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“…% in the PU matrix. [23][24][25] It can be supposed that reduction of these peaks related to disarrangement of PU structure because of adding cordierite. The peak at 700 cm −1 is referred to the Si-C bond that confirms the interaction between cordierite and PU.…”

Section: -7mentioning

confidence: 99%

Structural and optical properties of cordierite glass-ceramic doped in polyurethane matrix

2015

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The cordierite (2Mg.2Al 2 O 3 .5SiO 2 ) was synthesized by the Pechini method and added to polyurethane open cell (PUOC) foam in three different percentages. Fourier transform infrared spectroscopy (FTIR) was employed to evaluate the bonding characteristics of PUOC/cordierites. The effect of temperature on the synthesis of cordierite and crystallographic structure of the final product were studied by XRD. By increasing the temperature, the widths of the XRD peaks decreased, approaching the single crystal spectrum. The SEM results show that by increasing of cordierite percentage in PUOC foam, the matrix structure was much damaged. Using Z-scan method, optical nonlinearities of samples were measured by continues wave (CW) laser at the wavelength of 532 nm. The nonlinear refractive (NLR) indices and nonlinear absorption (NLA) coefficients of the synthesized samples are obtained in the order of 10 −8 (cm 2 /W) with negative sign and 10 −5 (cm/W), respectively. The origin of optical nonlinearity may be attributed to the presence of strong saturable absorption (SA) effect. C 2015 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution 3.0 Unported License.

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New polyurethane foams modified with cellulose derivatives

Cited by 116 publications

References 15 publications

Characterization of Rigid Polyurethane Foam Prepared from Recycling of PET Waste

Characterization of Rigid Polyurethane Foam Prepared from Recycling of PET Waste

Thermal and mechanical behaviour of flexible polyurethane foams modified with graphite and phosphorous fillers

Structural and optical properties of cordierite glass-ceramic doped in polyurethane matrix

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