Shape stabilised phase change materials based on a high melt viscosity HDPE and paraffin waxes

Mu, Mulan; Basheer, Pam; Sha, Wei; Bai, Yun; McNally, Tony

doi:10.1016/j.apenergy.2015.10.030

Cited by 141 publications

(53 citation statements)

References 53 publications

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“…The latter problem is nowadays addressed with two main techniques. The first method is the so‐called “shape stabilization,” which consists of the confinement of the PCM with a polymer matrix, a nanostructured layered material, or a percolative network constituted of an inorganic nanofiller . If a metallic or a carbon‐based material is used as stabilizing agent, it is also possible to increase the thermal conductivity of the system .…”

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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“…The first is the encapsulation of the PCMs in organic or inorganic micro-or nano shells, which also protect the PCM from the external environment and may increase its thermal stability [15][16][17]. The second method is called 'shape stabilization', and involves the confinement of the PCM using a polymer matrix [18][19][20][21], a porous or layered material [22,23] or an inorganic nanofiller [24][25][26]. 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].…”

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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“…Suitable additives are proposed to improve these properties [55,56]. In some articles, a simple method involves mixing-melting of polyethylene and paraffin, consequently cooling the composite, or using a simple twin extruder to prepare a shape-stable PCM has been reported [57,58]. When this compound contains sufficient polymer, a homogeneous mixture remains solid at temperatures above the melting point of paraffin and below the polymer melting point.…”

Section: Shape-stable Ppcmsmentioning

confidence: 99%

Paraffin as Phase Change Material

Vakhshouri¹

2020

Paraffin - An Overview

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Nowadays, numerous problems, including the environmental problem caused by fossil fuels, have led to greater attention to the optimal use of energy and the development of renewable energy. One of the most important parts of using energy efficiently is storing it. Among the many ways introduced for energy storage, thermal energy storage, including latent heat, is among the most interesting. This storage is done with materials called phase change materials (PCMs). These materials store the energy in the form of latent heat at constant temperature during the phase transition, discussed in this chapter, and release the same stored energy in the crystallization process. These materials are mainly classified into three categories: organic, inorganic, and eutectics. Today, these materials are widely used with different properties in a variety of fields. Paraffin is one of the most important organic PCMs due to its numerous advantages that will be discussed in the following sections. From the methods of using paraffinic PCMs, two main methods, encapsulation and shape-stable PCMs, are discussed in detail. On the whole, this chapter of the book attempts to briefly discuss paraffins and their unique role in thermal energy storage systems as phase change materials.

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Shape stabilised phase change materials based on a high melt viscosity HDPE and paraffin waxes

Cited by 141 publications

References 53 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

Paraffin as Phase Change Material

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