Analysis of thermal properties and heat transfer mechanisms for polyurethane foams blown with water

Choi, Sung Woong; Jung, Jae Min; Yoo, Hyeong Min; Kim, Sung Ha; Lee, Woo Il

doi:10.1007/s10973-018-6990-8

Cited by 23 publications

(12 citation statements)

References 32 publications

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“…Camila S. Carriço et al [ 212 ] synthesized rigid PUFs from a mixture of castor oil and CG, which presented a thermal conductivity between 0.0128–0.0207 W·m −1 ·K −1 . Sung Woong Choi et al [ 213 ] analyzed the thermal properties and heat transfer mechanisms of PUFs blown with water and reported a thermal conductivity between 0.023–0.027 W·m −1 ·K −1 . M. Kirpluks et al [ 214 ] used natural oil-based polyols as feedstock for the production of thermal insulation rigid PUFs, which presented a thermal conductivity below 0.022 W·m −1 ·K −1 , just to mention some recent reports that have highlighted the suitability of the use of PUFs as thermal insulation materials.…”

Section: Polyurethane Foams Applications and Enhancement Of Propermentioning

confidence: 99%

Polyurethane Foams: Past, Present, and Future

2018

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Polymeric foams can be found virtually everywhere due to their advantageous properties compared with counterparts materials. Possibly the most important class of polymeric foams are polyurethane foams (PUFs), as their low density and thermal conductivity combined with their interesting mechanical properties make them excellent thermal and sound insulators, as well as structural and comfort materials. Despite the broad range of applications, the production of PUFs is still highly petroleum-dependent, so this industry must adapt to ever more strict regulations and rigorous consumers. In that sense, the well-established raw materials and process technologies can face a turning point in the near future, due to the need of using renewable raw materials and new process technologies, such as three-dimensional (3D) printing. In this work, the fundamental aspects of the production of PUFs are reviewed, the new challenges that the PUFs industry are expected to confront regarding process methodologies in the near future are outlined, and some alternatives are also presented. Then, the strategies for the improvement of PUFs sustainability, including recycling, and the enhancement of their properties are discussed.

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Section: Polyurethane Foams Applications and Enhancement Of Propermentioning

confidence: 99%

Polyurethane Foams: Past, Present, and Future

2018

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“…Based on their chemical composition and mechanical properties such as strength, stiffness and rigidity, PUFs are generally categorized as rigid polyurethane foams (RPUFs), semi‐rigid polyurethane foams, and viscoelastic and flexible foams . Accordingly, these different kinds of PUFs have found their use in numerous applications over the years, such as furniture, construction, footwear, domestic appliances, automotive uses, refrigeration and as an insulating material . And as mentioned above, one of the major uses of PUFs (especially RPUFs) are as a core material for sandwich structures that are widely used in many applications.…”

Section: Polyurethane Foammentioning

confidence: 99%

A review on recent advances in sandwich structures based on polyurethane foam cores

et al. 2020

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Sandwich composites with a polyurethane foam (PUF) core have become a versatile set of materials with applications ranging from basic construction elements to advanced engineering materials. This diverse range of applications has provided these sandwich materials with a distinctive position in today's engineering world. This review focuses on the broad research that has been carried out on PUF core‐based sandwich composites over the years—especially in the last decade. Thorough details have been presented focusing on basic PUF core sandwich structures, advanced PUF core sandwich composites with different kinds of reinforcements and complex structures such as hybrid sandwich panels. All the research presented here has been categorized carefully, such as the types of materials used in various studies, the types of reinforcements and testing techniques used, including mechanical, electrical, dynamic, thermal and acoustic methods etc. Comparisons have also been made based on similar materials, similar testing procedures and similar application areas. Research areas have been highlighted by giving a deep insight into the most promising research, manufacturing techniques and improvement procedures. Major consumption areas and application sectors for PUF core sandwich composites have also been discussed in this review. Finally, conclusions have been made based on the results found from a literature investigation.

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“…Thermal conductivity is the most important property for RPU foams used as insulating materials. The thermal conductivity is determined by the following heat transfer mechanisms: conduction along the solid phase ( λ s ), conduction through the gas phase ( λ g ), thermal radiation ( λ r ) and convection within the cells ( λ c ). The latter is negligible for foams with small cell sizes (less than 2 mm) .…”

Section: Introductionmentioning

confidence: 99%

Long‐term thermal conductivity of cyclopentane–water blown rigid polyurethane foams reinforced with different types of fillers

Santiago‐Calvo

Tirado‐Mediavilla

Ruiz‐Herrero

et al. 2019

Polymer International

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An understanding of the long‐term thermal conductivity of rigid polyurethane (RPU) foams presents great interest in the building field considering the conservation of energy efficiency. In this study, the effect of different types of particles (talc, diatomaceous earth and non‐porous silica) on the thermal conductivity of RPU foams blown with cyclopentane and water as blowing agents was investigated during 3 years of aging. The characterization of the cellular structure shows how the addition of particles causes a cell size reduction of the foams, and consequently an enhancement of the thermal properties just after production. However, this initial reduction is not maintained, because each foam shows a different thermal conductivity evolution with time. We have found, for the first time, a relationship between the slope of the thermal conductivity versus time at the first measurements and the internal temperature reached during the foaming process. The evolution of the RPU foams in which higher internal temperatures were reached is more pronounced than in those RPU foams where lower foaming temperatures were observed. This effect is related to the kinetics of the diffusion of the gas occluded inside the cells and imposes a new criterion for the selection of particles to reduce the thermal conductivity of RPU foams; these additives should ideally decrease the temperature reached during the foaming process. Moreover, the effect of aging on the thermal conductivity is explained by using theoretical models. © 2019 Society of Chemical Industry

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Analysis of thermal properties and heat transfer mechanisms for polyurethane foams blown with water

Cited by 23 publications

References 32 publications

Polyurethane Foams: Past, Present, and Future

Polyurethane Foams: Past, Present, and Future

A review on recent advances in sandwich structures based on polyurethane foam cores

Long‐term thermal conductivity of cyclopentane–water blown rigid polyurethane foams reinforced with different types of fillers

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