Recent advances in polyurethanes as efficient media for thermal energy storage

Ahmadi, Younes; Kim, Ki‐Hyun; Kim, Sumin; Tabatabaei, Meisam

doi:10.1016/j.ensm.2020.05.003

Cited by 76 publications

(20 citation statements)

References 111 publications

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“…These composites have infinite potential as functional materials for various industries, thereby motivating researchers. However, interestingly, only seven review articles related to conducting polymer in PU matrices have been published since 1993 [ 2 , 20 , 21 , 22 , 23 , 24 , 25 , 26 ]. Nevertheless, their steady research progress has been reported, which has brought about extended applications of PUs.…”

Section: Introductionmentioning

confidence: 99%

Revised Manuscript with Corrections: Polyurethane-Based Conductive Composites: From Synthesis to Applications

Choi¹,

Shin

et al. 2022

IJMS

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The purpose of this review article is to outline the extended applications of polyurethane (PU)-based nanocomposites incorporated with conductive polymeric particles as well as to condense an outline on the chemistry and fabrication of polyurethanes (PUs). Additionally, we discuss related research trends of PU-based conducting materials for EMI shielding, sensors, coating, films, and foams, in particular those from the past 10 years. PU is generally an electrical insulator and behaves as a dielectric material. The electrical conductivity of PU is imparted by the addition of metal nanoparticles, and increases with the enhancing aspect ratio and ordering in structure, as happens in the case of conducting polymer fibrils or reduced graphene oxide (rGO). Nanocomposites with good electrical conductivity exhibit noticeable changes based on the remarkable electric properties of nanomaterials such as graphene, RGO, and multi-walled carbon nanotubes (MWCNTs). Recently, conducting polymers, including PANI, PPY, PTh, and their derivatives, have been popularly engaged as incorporated fillers into PU substrates. This review also discusses additional challenges and future-oriented perspectives combined with here-and-now practicableness.

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Section: Introductionmentioning

confidence: 99%

Revised Manuscript with Corrections: Polyurethane-Based Conductive Composites: From Synthesis to Applications

Choi¹,

Shin

et al. 2022

IJMS

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“…Literature also shows that it is possible to use specific coatings that prevent the negative effect of flames of PU foam [11][12][13][14][15][16].To enhance the thermal performance of PU foam, however, literature has also presented several innovative ideas that include the use of PCMs as a sustainable material with little environmental impact.Attempts of incorporation of PCMs for within the matrix of PU foams have shown to be successful in terms of increasing insulation capabilities [17][18][19][20][21][22][23][24][25]. Various methods have been devised for this purpose such as direct amalgamation of PCMs and incorporation of polymer micro-encapsulated PCMs [17][18][19][20][21][22][23][24][25].It is worthy to note that other useful purposes such as thermal storage have been seen to benefit from such incorporation [26][27][28][29].This approach has proven to be promising from the perspective of thermal performance.However, many PCMs are inherently flammable, especially in the case of wax-based PCMs such as paraffin wax, which seems to be of interest to many due to other advantageous characteristics. It is possible that the combination of PU foam and wax-based PCM would create a highly flammable material that is unusable if untreated.…”

Section: Introductionmentioning

confidence: 99%

INFLUENCE OF PHASE CHANGE MATERIALS (PCMs) ON POLYURETHANE (PU) FOAM FIRE-RETARDATION

Mohammed

Aly

Elnokaly

et al. 2022

Journal of Advanced Engineering Trends

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Polyurethane (PU) foam is a material that has long been regarded as a good thermal insulator for building purposes due to many advantageous attributes, such as cost and feasibility. Yet, to further develop its performance, many studies have focused on the potential of using the micro-structure of PU foam as an encapsulation for PCMs. Despite the apparent advantageous outcome of this premise, from the perspective of thermal performance, fire-retardancy issues may pose as a threat. PU foam is known for its inherent poor fire-retardation properties. With the addition of PCMs, especially waxbased, it is possible that the fire-retardancy would worsen. This would translate into additional costs in terms of application of treatments to counter the disadvantageous hazardous properties. In this study,an empirical investigation is carried out with the aim of determining whether addition PCMs to PU foam would influence its retardation, and to which extent.In this context, granules of wax-based PCMs are encapsulated in to closed-cell rigid PU foam via a simplified amalgamation method. Two concentrations of PCM content are presented in this paper. Then, fire-retardancy testing is performed on specimens to compare the performance of the created PU/PCM specimens with this of regular PU specimens. The outcome of this empirical investigationfurther confirms that addition of PCM to PU foam is disadvantageous in terms of fire-retardancy, and that the amount of added PCM is of considerable influence on this.

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“…1 To solve the collection and reuse of energy in time and space, energy storage technology has attracted considerable attention. [2][3][4] Attributed to the characteristics of high energy storage density, small temperature difference between storage and recovery, convenience, simplicity and rapidity, phase change materials (PCMs) have been much applied in energy storage, which can undergo phase transformation in a certain range of temperature and capture a large amount of excess heat energy. [5][6][7] Based on the different states the in phase change process, PCMs are divided into three types: solid-solid PCMs, solidliquid PCMs and liquid-gas PCMs.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous phase change energy storage and thermoresponsive shape memory properties of porous poly(vinyl alcohol)/phase change microcapsule composites

Shi

Liu

et al. 2021

Polymer International

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Porous poly(vinyl alcohol) (PVA)/phase change microcapsule composites with shape memory properties were prepared by physical foaming, cycles of freezing-thawing and freeze drying. The effects of phase change microcapsules on pore structure, phase change energy storage capacity, thermal stability, crystallinity, mechanical properties, shape memory properties and water absorption and retention of the porous composites were investigated. With an increase of the proportion of phase change microcapsules, the pore density, pore size and water absorption and retention of the porous composite materials were decreased, while the phase change energy storage performance was improved and ΔH m was up to 31.22 J g −1 . The phase change energy storage of the porous composites was stable even after 50 phase transition cycles. Meanwhile, the thermal stability of the porous composites was also not affected by the addition of phase change microcapsules. The entanglement of PVA molecular chains in the porous composites was affected by the microcapsules embedded in the matrix of PVA during freezingthawing cycles, resulting in a change of crystallinity and mechanical properties of the porous composites. The porous composites with phase change energy storage capacity also showed good shape memory performance with shape recovery rate of 100% even after multiple deformation, which was expected to expand the multi-field application of dual-functional materials.

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Recent advances in polyurethanes as efficient media for thermal energy storage

Cited by 76 publications

References 111 publications

Revised Manuscript with Corrections: Polyurethane-Based Conductive Composites: From Synthesis to Applications

Revised Manuscript with Corrections: Polyurethane-Based Conductive Composites: From Synthesis to Applications

INFLUENCE OF PHASE CHANGE MATERIALS (PCMs) ON POLYURETHANE (PU) FOAM FIRE-RETARDATION

Simultaneous phase change energy storage and thermoresponsive shape memory properties of porous poly(vinyl alcohol)/phase change microcapsule composites

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