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The thermal decomposition and foaming behaviors of blowing agent AC (azodicarbamide) and exo-endothermic blowing agent DDL-105 were investigated systematically. The gas and enthalpy release both showed that DDL-105 exhibited a milder decomposition. The blowing ratio and cell structure were...
The mechanism of discoloration (‘scorch’) of water-blown flame-retardant polyurethane (PU) foams has been studied. As UV spectroscopy showed, scorch is a kinetically controlled phenomenon, and it can occur either in flame-retardant or non-flame-retardant foams. Isolated isocyanate groups in...
Polyurethane foam, used as a supporting or insulating material, is sometimes formed in complex molds with significant variations in geometry and size. This work investigates the relationships between cell morphology, density, and mechanical properties in a molded polyurethane material using...
The thermal conductivity of three mixtures of nitrogen and cyclopentane is measured using a transient hot wire method, at temperatures between 315.14 and 395.89 K, and pressures up to 0.53 MPa. These mixtures are important in the evaluation of the evolution of the thermal insulation capacity of...
We have developed a numerical method for unsteady three-dimensional (3D) simulation of rigid polyurethane (PU) foaming flow in a refrigerator cabinet in this study. The governing equation for the compressible foaming flow is approximated with the Navier-Stokes equation, which means the foaming...
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