Plasticized open-cell polyurethane foam as a universal matrix for organic reagents in trace element preconcentration

1974 ◽  
Vol 69 (1) ◽  
pp. 85-96 ◽  
Author(s):  
T. Braun ◽  
A.B. Farag
Keyword(s):  
Trace Element ◽  
Polyurethane Foam ◽  
Open Cell ◽  
Organic Reagents

scholarly journals Effective Thermal Conductivity of Open Cell Polyurethane Foam Based on the Fractal Theory

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Kan Ankang ◽  
Han Houde
Keyword(s):  
Thermal Conductivity ◽  
Fractal Dimension ◽  
Effective Thermal Conductivity ◽  
Polyurethane Foam ◽  
Solid Phase ◽  
Fractal Theory ◽  
Heat Radiation ◽  
Total Thermal Conductivity ◽  
Equivalent Thermal Conductivity ◽  
Open Cell

Based on the fractal theory, the geometric structure inside an open cell polyurethane foam, which is widely used as adiabatic material, is illustrated. A simplified cell fractal model is created. In the model, the method of calculating the equivalent thermal conductivity of the porous foam is described and the fractal dimension is calculated. The mathematical formulas for the fractal equivalent thermal conductivity combined with gas and solid phase, for heat radiation equivalent thermal conductivity and for the total thermal conductivity, are deduced. However, the total effective heat flux is the summation of the heat conduction by the solid phase and the gas in pores, the radiation, and the convection between gas and solid phase. Fractal mathematical equation of effective thermal conductivity is derived with fractal dimension and vacancy porosity in the cell body. The calculated results have good agreement with the experimental data, and the difference is less than 5%. The main influencing factors are summarized. The research work is useful for the enhancement of adiabatic performance of foam materials and development of new materials.

Measurement and Prediction of Thermal Conductivity of Open Cell Rigid Polyurethane Foam

2001 ◽  
Vol 37 (4) ◽  
pp. 310-332 ◽  
Author(s):  
Wei-Han Tao ◽  
Hung-Che Hsu ◽  
Chih-Chen Chang ◽  
Chuan-Liang Hsu ◽  
Yung-Sen Lin
Keyword(s):  
Thermal Conductivity ◽  
Polyurethane Foam ◽  
Rigid Polyurethane Foam ◽  
Open Cell

Preparation of open cell rigid polyurethane foams and modified with organo-kaolin

2019 ◽  
Vol 56 (4) ◽  
pp. 435-447
Author(s):  
Guojian Wang ◽  
Tao Yang
Keyword(s):  
Compressive Strength ◽  
Polyurethane Foam ◽  
Coupling Agent ◽  
Silane Coupling Agent ◽  
Polyurethane Foams ◽  
Compressive Property ◽  
Rigid Polyurethane Foam ◽  
Open Cell ◽  
Silane Coupling ◽  
Cell Opening

The open cell rigid polyurethane foam (ORPUF) was prepared by adding chemical cell openers including O-500 and AK-9903. The FTIR results of cell openers and open cell rate of ORPUFs showed that O-500 has more effective cell opening capacity. In the ORPUF foaming formulation using O-500 as cell opener, silane coupling agent (KH-550) modified kaolin (organo-kaolin) was introduced into ORPUF with different weight loadings. The cellular morphology, apparent density, and compressive strength of the foams were tested in order to investigate the effects of organo-kaolin on the open cell rate and compressive property of the foams. The results showed that the open cell rate of ORPUFs slightly increased from 83.9% to 92.9% with the content of organo-kaolin. Meanwhile, compared to neat ORPUF, the compressive strength of foams increased by 72.8% when the content of introduced organo-kaolin was 4 parts per hundred of polyol by mass (php).

scholarly journals Carbon nano-ink coated open cell polyurethane foam with micro-architectured multilayer skeleton for damping applications

RSC Advances ◽  
2016 ◽  
Vol 6 (83) ◽  
pp. 80334-80341 ◽  
Author(s):  
Xiao-Chong Zhang ◽  
Fabrizio Scarpa ◽  
Ronan McHale ◽  
Andrew P. Limmack ◽  
Hua-Xin Peng
Keyword(s):  
Carbon Nanotube ◽  
Energy Dissipation ◽  
Polyurethane Foam ◽  
Open Cell ◽  
Frictional Damping ◽  
Open Cell Foams ◽  
Carbon Nanotube Ink

Carbon nanotube ink coated multilayered polyurethane open cell foams utilize the CNT–CNT interfacial frictional damping mechanism, thus dramatically improving the foam energy dissipation capability by 270%.

scholarly journals Sorption of Ga (III) on Flexible Open Cell Polyurethane Foam of Polyether Type Impregnated with Tri-N-Buthyl Phospate

2007 ◽  
Vol 2 (1) ◽  
pp. 51-57
Author(s):  
Lavinia Tofan ◽  
Doina Bilba ◽  
Carmen Paduraru ◽  
Ovidiu Toma
Keyword(s):  
Thermodynamic Parameters ◽  
Polyurethane Foam ◽  
Contact Time ◽  
Solution Temperature ◽  
Open Cell ◽  
Langmuir Isotherms ◽  
Batch Sorption ◽  
Solution Acidity

The obtained results concerning the Ga (III) ion retention on flexible open cell polyurethane foam of polyether type pretreated with tri-n-butyl phosphate are presented. The influence of solution acidity, phases contact time, Ga (III) concentration and solution temperature have been investigated. The parameters of Ga (III) batch sorption have been optimized. On the basis of Langmuir isotherms, the sorption constants and the thermodynamic parameters, ∆G, ∆Η and ∆S have been calculated.

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