Thermal conductivity of physically crosslinked closed cell polyolefin foams

Rodríguez‐Pérez, Miguel Ángel; Alonso, O.; Souto, J.; Saja, J.A. de

doi:10.1016/s0142-9418(96)00050-5

Cited by 42 publications

(29 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The main characteristics of this equipment has been explained previously. 19 Heat flow through the test sample (q) results from having a temperature gradient (␦T) across the material. The thermal conductivity is defined according to Fourier's equation:…”

Section: Thermal Conductivitymentioning

confidence: 99%

Prediction of the radiation term in the thermal conductivity of crosslinked closed cell polyolefin foams

Almanza

Rodríguez‐Pérez

Saja

2000

J. Polym. Sci. B Polym. Phys.

View full text Add to dashboard Cite

Section: Thermal Conductivitymentioning

confidence: 99%

Prediction of the radiation term in the thermal conductivity of crosslinked closed cell polyolefin foams

Almanza

Rodríguez‐Pérez

Saja

2000

J. Polym. Sci. B Polym. Phys.

View full text Add to dashboard Cite

“…First, the density of the foams is high (ca. 50 for PU1 and 100 kg/m 3 for PU2), what should reduce the radiation contribution, thus increasing the value of the solid contribution . Second, the density of the foams increases when the particles are added, what should increase the conduction through the solid phase.…”

Section: Resultsmentioning

confidence: 99%

Impact of expandable graphite on flame retardancy and mechanical properties of rigid polyurethane foam

et al. 2018

View full text Add to dashboard Cite

Flame retardant (FR) and mechanical performance properties of two different rigid polyurethane foams (RPUFs) containing expandable graphite (EG) as FR additive were studied. The impact of EG on the foam properties were evaluated. Cellular structures were less homogeneous in foams containing EG. Thermal conductivities of RPUF increased slightly with EG addition. FR properties of the foams were evaluated by limiting oxygen index (LOI) test, vertical burning test (UL94), and cone calorimeter test. The addition of EG improved the FR performance and increased the density of the foams. For example, LOI value was increased from 18.4 to 25.2 in EG10PU1, whereas for EG10PU2, LOI increased from 19.2 to 29.8. In UL94 test, EG10PU1 reached V‐1 rating, while EG8PU2 passed V‐0 rating. Results from cone calorimeter test showed that the EG in the RPUF effectively reduced heat release rate, total heat released, total smoke production, and mass loss rate with increase in EG. This improvement was more efficient for the higher density foam. In addition, low loading of EG in PU1 increased the compression performance but decreased as the amount of EG was further increased. POLYM. COMPOS., 40:E1705–E1715, 2019. © 2018 Society of Plastics Engineers

show abstract

“…In this foaming method the sheet is passing horizontally through a hot air heated foaming oven; consequently, the sheet is stretched during the expansion, which results in elongated cells in the machine direction. 9 The cellular structure of an Alveolux foam can be observed in Figure 4(b). This material was not stretched during its expansion; consequently, its cells were almost spherical.…”

Section: Semmentioning

confidence: 99%

Anomalous thickness increase in crosslinked closed cell polyolefin foams during heat treatments

Rodríguez‐Pérez

Almanza

Saja

1999

J. Appl. Polym. Sci.

View full text Add to dashboard Cite

When crosslinked closed cell polyolefin foams are under a temperature above the melting point of the base polymer, a reduction of their size is expected due to the gas diffusion out of the foam. However, some kinds of crosslinked closed cell polyolefin foams present one direction (thickness direction) in which the foam size increases during the first minutes of the thermal treatment. The thickness of the foams after the thermal treatment can be higher than the thickness of the original foams. An experimental study is presented on the thickness increase, as well as on the changes in the dimensions and the properties of foams with different densities, which were obtained from different foaming processes and made of different base polymers, as a function of the treatment temperature and the treatment time. This investigation sought to discover the physics mechanisms that control the anomalous thickness increase. The experimental results show that the thickness increase of these materials is related to the anisotropic cellular structure of the original foams.

show abstract

Thermal conductivity of physically crosslinked closed cell polyolefin foams

Cited by 42 publications

References 4 publications

Prediction of the radiation term in the thermal conductivity of crosslinked closed cell polyolefin foams

Prediction of the radiation term in the thermal conductivity of crosslinked closed cell polyolefin foams

Impact of expandable graphite on flame retardancy and mechanical properties of rigid polyurethane foam

Anomalous thickness increase in crosslinked closed cell polyolefin foams during heat treatments

Contact Info

Product

Resources

About