Polyethylene Wax/Epdm Blends as Shape-Stabilized Phase Change Materials for Thermal Energy Storage

Dorigato, Andrea; Ciampolillo, Maria Vittoria; Cataldi, Annalisa; Bersani, M.; Pegoretti, Alessandro

doi:10.5254/rct.82.83719

Cited by 30 publications

(28 citation statements)

References 8 publications

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“…Among organic PCMs, paraffin waxes are the most widely used in TES applications, especially because of their elevated energy density, narrow working temperature range, versatility, lightness, and cheapness . Thanks to these peculiar features, TES systems based on PCMs can be successfully applied in buildings, smart textiles, solar plants, hot/cold water storage, and the thermal regulation of electronic devices . The most serious drawbacks of organic PCMs are their intrinsic limited thermal conductivity and the need for confinement to avoid leakage when above their melting point .…”

Section: Introductionmentioning

confidence: 99%

Application of the thermal energy storage concept to novel epoxy–short carbon fiber composites

Dorigato

Fredi

Pegoretti

2019

J of Applied Polymer Sci

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For the first time, multifunctional epoxy-short carbon fiber reinforced composites suitable for thermal energy storage technology were developed. Paraffin microcapsules (MC) and short carbon fibers (CFs) were added at different relative amounts to an epoxy matrix, and the microstructural and thermomechanical properties of the resulting materials were investigated. Scanning electron microscopy images of the composites showed a uniform distribution of the capsules within the matrix, with a rather good interfacial adhesion, while the increase in the polymer viscosity at elevated CF and MC amounts caused an increase in the void content. Differential scanning calorimetry tests revealed that melting enthalpy values (up to 60 J/g) can be obtained at high MC concentrations. The mixing and thermal curing of the composites did not lead to breakage of the capsules and to the consequent leakage of the paraffin out of the epoxy matrix. The thermal stability of the prepared composites is not negatively affected by the MC addition, and the temperatures at which the thermal degradation process begins were far above the curing or service temperature of the composites. Flexural and impact tests highlighted that the presence of MC reduces the mechanical properties of the samples, while CF positively contributes to retaining the original stiffness and mechanical resistance.

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Section: Introductionmentioning

confidence: 99%

Application of the thermal energy storage concept to novel epoxy–short carbon fiber composites

Dorigato

Fredi

Pegoretti

2019

J of Applied Polymer Sci

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“…Examples of such fields can be the automotive, aerospace, portable electronics and technical garments industries. However, even though there are many examples in the literature of encapsulated and shape stabilized PCMs embedded in a polymer matrix [5,12,17,29,[39][40][41][42], only few papers can be found that deal with the development of polymer composites merging structural and TES functions. Most of the examples of such composites regard sandwich structures that have functions of thermal management with [22] or without [43,44] the use of a PCM.…”

Section: Introductionmentioning

confidence: 99%

“…If the shape stabilization is performed with a metallic or a carbon based material, this also leads to an increase of the overall thermal conductivity [27,28]. TES systems based on PCMs find applications in buildings [29,30], hot/cold water storage [31], solar thermal power plants [32], smart thermoregulating textiles [25,33], and thermal management of electronic devices [22]. In most of these applications, the TES function is performed by a dedicated added module, containing PCMs.…”

Section: Introductionmentioning

confidence: 99%

Multifunctional glass fiber/polyamide composites with thermal energy storage/release capability

Fredi¹,

Dorigato²,

Pegoretti³

2018

Express Polym. Lett.

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Abstract. Thermoplastic composite laminates with thermal energy storage (TES) capability were prepared by combining a glass fabric, a polyamide 12 (PA12) matrix and two different phase change materials (PCMs), i.e. a paraffinic wax microencapsulated in melamine-formaldehyde shells and a paraffin shape stabilized with carbon nanotubes. The melt flow index of the PA12/PCM blends decreased with the PCM concentration, especially in the systems with shape stabilized wax. Differential scanning calorimetry showed that, for the matrices with microcapsules, the values of enthalpy were approximately the 70% of the theoretical values, which was attributed to the fracture of some microcapsules. Nevertheless, most of the energy storage capability was preserved. On the other hand, much lower relative enthalpy values were measured on the composites with shape stabilized wax, due to a considerable paraffin leakage or degradation. The subsequent characterization of the glass fabric laminates highlighted that the fiber and void volume fractions were comparable for all the laminates except for that with the higher amount of shape stabilized wax, where the high viscosity of the matrix led to a low fiber volume fraction and higher void content. The mechanical properties of the laminates were only slightly impaired by PCM addition, while a more sensible drop of the elastic modulus, of the stress at break and of the interlaminar shear strength could be observed in the shape stabilized wax systems.

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“…wide phase transition temperature range, lightness and limited costs [23,24], paraffinic waxes are the most widely investigated [21,[25][26][27]. However, their relatively low thermal conductivity and the possible leakage above the melting point limit their applications in several technologies [28].…”

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confidence: 99%

“…Encapsulation in more stable polymer matrices [27,29] can be a solution to avoid their flow at elevated temperature, thus forming a shape-stabilized phase change material (SSPCM) [30]. Several SSPCMs with various polymer matrices such as high-density polyethylene (HDPE) [31,32], polypropylene (PP), acrylic resins, epoxy resins [33][34][35], poly(methylmethacrylate) (PMMA), poly urethane [36] block copolymer, ethylene-propylene diene monomer rubber (EPDM) [27], styrene-butadiene-styrene (SBS) triblock copolymer [32,37], polyvinylchloride (PVC) [38] were considered. In many cases, also the PCM stabilization through the addition of inorganic nanofillers was considered [37,39].…”

mentioning

confidence: 99%

Phase changing nanocomposites for low temperature thermal energy storage and release

Dorigato¹,

Canclini²,

Unterberger³

et al. 2017

Express Polym. Lett.

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It is well known that through thermal energy storage (TES) systems it is possible to store (release) thermal energy by heating (cooling) a medium in order to utilize the stored energy when required. Possible applications involve power generation systems [1][2][3][4] and building constructions [5], where about one half of the energy demand is in the form of thermal energy, and the requirement may markedly vary in time [6][7][8]. TES technology have been also investigated in the textiles industry for the production of 'smart' fabrics able to maintain the right temperature of the body [9][10][11][12][13][14]. Other applications could be represented by the food storage [15,16] and the development of innovative solar plants [17][18][19]. Latent heat TES systems has recently attracted the attention of researchers, because these systems are characterized by a high energy storage density at constant temperature corresponding to the transition temperature of the phase change material (PCM) [18,20]. Generally speaking, a solid/liquid or a solid/solid phase transition could occur, and depending on their chemical nature these materials can be classified as organic, inorganic or eutectic. Organic PCM have several advantages [21,22] Abstract. The aim of this paper is to develop new elastomeric phase change materials (PCM) for the thermal energy storage/release below room temperature. In particular, poly(cyclooctene) (PCO)/paraffin blends filled with various concentrations of carbon nanotubes (CNTs), were prepared by a melt compounding process. The microstructural, thermo-mechanical and electrical properties of the resulting materials were investigated. The microstructure of these materials was characterized by the presence of paraffin domains inside the PCO, and CNTs were located only inside the paraffin domains in forms of aggregated clusters. DSC tests evidenced the existence of two distinct crystallization peaks at -10 and at 6°C, respectively associated to the paraffin and the PCO phases, indicating that both the polymeric constituents are thermally active below room temperature. Moreover, CNT addition did not substantially alter the melting/crystallization properties of the material. Noticeable improvements of the mechanical properties and of the electrical conductivity with respect to the neat PCO/paraffin blend could be obtained upon CNT addition, and also thermal conductivity/diffusivity values were considerably enhanced above the percolation threshold. Finite element modeling demonstrated the efficacy of the prepared nanocomposites for applications in the thermal range from -30 to 6°C.

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Polyethylene Wax/Epdm Blends as Shape-Stabilized Phase Change Materials for Thermal Energy Storage

Cited by 30 publications

References 8 publications

Application of the thermal energy storage concept to novel epoxy–short carbon fiber composites

Application of the thermal energy storage concept to novel epoxy–short carbon fiber composites

Multifunctional glass fiber/polyamide composites with thermal energy storage/release capability

Phase changing nanocomposites for low temperature thermal energy storage and release

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