Accelerated Aging of Rigid Polyurethane Foam

Brandreth, Dale A.; Ingersoll, H. G.

doi:10.1177/0021955x8001600405

Cited by 29 publications

(15 citation statements)

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“…Its ease of manufacture and its insulation capabilities will keep polyurethane foam demands high in the decades to come. Over the last few years much work has been done in an effort to understand and improve the efficiency of polyurethane foams [1][2][3][4][5][6][7][8][9][10]. Work in this laboratory has indicated that the thermal conductivity change, due to aging, is greater in some foams than others.…”

Section: Introductionmentioning

confidence: 99%

“…factor is well known [1][2][3][4][5][6][7][8][9][10]. The diffusion coefficient D and the gas solubility in the polymer S are related to permeability P as follows:…”

Section: Introductionmentioning

confidence: 99%

“…A similar foam was analyzed for gas composition according to the procedure described by Brandreth [1]. Analysis showed approximately 58% of the trichloroflouromethane remained in the cell.…”

Section: Introductionmentioning

confidence: 99%

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Effects of Polymer Structure on K-Factor Aging of Rigid Polyurethane Foam

Booth

Lee

1985

Journal of Cellular Plastics

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Section: Introductionmentioning

confidence: 99%

“…factor is well known [1][2][3][4][5][6][7][8][9][10]. The diffusion coefficient D and the gas solubility in the polymer S are related to permeability P as follows:…”

Section: Introductionmentioning

confidence: 99%

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Effects of Polymer Structure on K-Factor Aging of Rigid Polyurethane Foam

Booth

Lee

1985

Journal of Cellular Plastics

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“…where V 1 = 93% and V 0 = 3% are the constants of the volume content of pores, K~ 179 h -1 are the rate constants, E 1 = 49 kJ/mol is the effective activation energy, and T is the aging temperature, K. In this case, the correlation factor of model (6) and the experimental data is 0.96, while the standard deviation is 8.3%.…”

Section: (4)mentioning

confidence: 96%

“…Therefore, it is important to predict the thermal conductivity of foam plastics during long-term aging. This problem is of particular interest from the ecological point of view when replacing freon by alternative ecologically safe foaming agents [2,3,[5][6][7][8]14]. In this context, the objective of this study is to estimate the effect of structure on the thermal conductivity of foam polymers during long-term aging.…”

mentioning

confidence: 99%

Effect of the cellular structure on thermal conductivity of rigid closed-cell foam polymers during long-term aging

Dementyev¹,

Dementyev

Zinger³

et al. 1999

Mech Compos Mater

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The thermal conductivity of rigid closed-ceU polyurethane foams during long-term aging has been studied. The As shown in numerous studies [1][2][3][4][5][6][7][8][9][10][11][12], heat in foams is transferred mainly through thermal conductivity of the gas in cells and of the base polymer, and also through radiation. In particular, in a foam polyurethane (FPU) freshly prepared from freon-ll for heat insulation, about 15% of heat transfer is accounted for by the thermal conductivity of the polymer, 50% by the thermal conductivity of the gas in cells, and 35% by radiation [2]. The component of gas convection in cells can be neglected, since the cell diameter of heat-insulating foam plastics is smaller than 1 mm.Prediction of the long-term thermal conductivity of foamed plastics is usually based on the examination of changes in the gas composition and pressure in closed cells taking into account the gas diffusion in foam materials [1][2][3][4][5][6][7][8][9][10]. It is assumed that their structure does not change during long-term aging.However, in advanced stages of aging, the process mechanism can change, for example, due to the effect of aging on the polymer [13]. Therefore, it is important to predict the thermal conductivity of foam plastics during long-term aging. This problem is of particular interest from the ecological point of view when replacing freon by alternative ecologically safe foaming agents [2,3,[5][6][7][8]14]. In this context, the objective of this study is to estimate the effect of structure on the thermal conductivity of foam polymers during long-term aging.Foam plastics of different brands were examined. Rigid foam polyurethane FPU-331 was obtained by the reaction of polyisocyanate PITS-D and a blend of polyethers P-373 and L-294. FPU-305A was obtained on the basis of polyisocyanate and polyether Laprol-805. Elastic FPU-E-35-0.8 was obtained on the basis of diisocyanate TDI 65/35 and polyester P-2200, while FPU-75

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In‐situ thermal aging of biobased and conventional rigid polyurethane foams nanostructured with bacterial nanocellulose

Diaz

Cerrutti

Chiacchiarelli

2021

J of Applied Polymer Sci

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The incorporation of nanofillers and the use of biobased polyols might have a deleterious effect on the aging performance of rigid polyurethane foams (RPUFs) applied in the insulation and marine industries. To study this, RPUFs obtained from petroleum based (RPUF) and castor oil (RPUFRIC) polyols were nanostructured with bacterial nanocellulose (BNC) up to 0.3 wt%. Water immersion experiments revealed that the normalized water absorption (NWA) at the steady state was not affected by lower BNC contents (<0.2 wt%). Higher BNC contents caused a complex effect on post‐cure and foaming, generating cell size expansion as well as shrinkage. In‐situ DMA aging analysis revealed that the specific storage modulus (E'sp) under flexural conditions of the RPUFRIC and RPUF decreased by a maximum amount of 7.27% and 6.19%, respectively. The effect of BNC on the E'sp was negligible, expect for the case of the RPUF, where higher BNC concentrations (>0.2 wt%) caused a decrease of up to 13.69%. The previous results reinforce the hypothesis that the incorporation of BNC in both conventional and biobased polyurethane systems do not cause significant changes on the aging performance of the resulting foams, provided that low BNC concentrations are employed.

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Accelerated Aging of Rigid Polyurethane Foam

Cited by 29 publications

References 1 publication

Effects of Polymer Structure on K-Factor Aging of Rigid Polyurethane Foam

Effects of Polymer Structure on K-Factor Aging of Rigid Polyurethane Foam

Effect of the cellular structure on thermal conductivity of rigid closed-cell foam polymers during long-term aging

In‐situ thermal aging of biobased and conventional rigid polyurethane foams nanostructured with bacterial nanocellulose

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