Thermal Conductivity and Life of Polymer Foams

Contribution to the gas chromatographic analysis for both refrigerants composition and cell gas in insulating foams – Part II: Aging of insulating foams

“…Indeed, for the 45 kg/m 3 HCFC141b foam, a 10% HCFC141b reduction occurs in 6 months, while for the 40 kg/m 3 a respective 25% reduction occurs. No other experimental result could be found in literature to confirm this observation; however, the calculations of Norton [9] and Biesmans et al [10] suggest similar findings. Norton [9] studied the influence of foam density on the thermal conductivity and found that its value increases by 40% in 6 months for a 35 kg/m 3 CFC11 foam, and by only 25% for a 70 kg/m 3 foam.…”

Methods to Calculate Gas Diffusion Coefficients of Cellular Plastic Insulation from Experimental Data on Gas Absorption

“…Researchers have developed various techniques to determine these coefftcients. Ballet al [6) cal.cu lated the diffusion coefficients of 0 2 and N 2 in a polyurethane foam from thermal conductivity data, Norton (1] derived these from gas composition data and Cuddihy and Moacanin [7] calculated the ruffusion coefficients from rate of weight loss of samples kept in vacuum. These earlier attempts generated data which differed significantly from method to method [5] and the di· fferences cannot be explained only on the basis of the difference in the test materials.…”

“…For the past two decades, researchers have been developing theoretical models to predict the long term behavior of cellular plastics [1][2][3][4]. As Valenzuela and Glicksman stated in a review [5].…”

Closed Cell Foam Insulation: A Review of Long Term Thermal Performance Research

“…Research related to closed-cell foam insulation dates back to the 1960s [Cuddihy and Moacanin, 1967;Norton, 1967]. This form of insulation is often more costly than other products, but offers relatively high thermal resistance and intrinsic strength properties.…”