Phase change materials based on high-density polyethylene filled with microencapsulated paraffin wax

Krupa, Igor; Nógellová, Zuzana; Špitálský, Zdenko; Janigová, Ivica; Boh, Bojana; Šumiga, Boštjan; Kleinová, Angela; Karkri, Mustapha; Al-Maadeed, Somaya

doi:10.1016/j.enconman.2014.06.061

Cited by 80 publications

(34 citation statements)

References 29 publications

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“…For the matrices with capsules, the melting enthalpy of the PCM increases with an increase of capsules content, and the relative developed enthalpy is approximately 70% of the expected one, according to the nominal capsules content. These values of relative melting and crystallization enthalpy of the PCMs are comparable with those observed in the literature for blends with paraffin microcapsules embedded in a thermoplastic polymeric matrix [60,61]. This suggests that, during the processing steps, some capsules were broken, and the paraffin leaked out of the blend.…”

Section: Characterization Of the Laminatessupporting

confidence: 76%

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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Section: Characterization Of the Laminatessupporting

confidence: 76%

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

Fredi¹,

Dorigato²,

Pegoretti³

2018

Express Polym. Lett.

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“…However, as a result of the limitations imposed on the system performances due to poor thermal conductivity of the LHS material, such heat dissipation is usually conducted through the flow of a heat-transfer fluid (Sastry et al 2008, Xie and Chen 2009, Gupta et al 2011). Numerous techniques have previously been proposed and successfully demonstrated for enhancing the rate of heat transfer of PCMs (Regin et al 2008, Zhou and Zhao 2011, Krupa et al 2014, Trigui et al 2014, AlMaadeed et al 2015. Earlier techniques used included the application of metal fillers such as aluminium or copper additives, metal foams or fins, and so on.…”

Section: Thermal Conductivity Of Pcmsmentioning

confidence: 98%

“…Latent heat storage (LHS) is one of the most effective means of storing thermal energy. PCMs are efficient and useful in thermal management applications due to their high storage density and the small temperature differential between stored and released heat (Krupa et al 2014). Paraffin wax has numerous uses, although versatility in application is limited because of low thermal conductivity (Trigui et al 2014).…”

Section: Thermal Conductivity Of Pcmsmentioning

confidence: 99%

“…Therefore, recently, PNCs filled with EG have demonstrated remarkable improvement of the mechanical and thermophysical properties of PCMs, including the electrical and thermal conductivities. (Regin et al 2008, Zhou and Zhao 2011, Krupa et al 2014, Trigui et al 2014. EG is produced through reaction of natural graphite flakes in sulfuric acid, with graphite subjected to thermal shock, resulting in a unidirectional expansion of the graphite nanoplatelets, which produces highly porous accordions of worm-like graphite.…”

Section: Thermal Conductivity Of Pcmsmentioning

confidence: 99%

“…However, the inclusion of these particles can increase both the weight and cost of producing these storage devices, while some of them are not compartible with the PCMs. Recently, carbon derivatives, which are stable, economical, chemically inert with low bulk-density, and high thermal conductivity have been studied as potential fillers for improving the heat dissipation of PCMs (Krupa et al 2014). Carbon derivatives exhibiting porosity have an interconnected open-cell structure with graphitic linkages of high heat dissipation (Lafdi et al 2008).…”

Section: Thermal Conductivity Of Pcmsmentioning

confidence: 99%

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Recently emerging trends in thermal conductivity of polymer nanocomposites

Idumah

Hassan²

2016

Reviews in Chemical Engineering

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Due to escalating power densities in electronics, information, communication, energy storage, aerospace, and automobile technologies, heat dissipation has become immensely essential for the efficient performance and reliability of photonic, electronics, optoelectronics, and other devices in order to proactively prevent premature failure due to overheating. The functionalization and synergistic inclusion of thermally conducting nanoparticles such as carbon derivatives and metallic and ceramic fillers into polymer matrices have resulted in development of thermally conducting polymer nanocomposites. This has enlarged the scope of application of these materials in areas hitherto restricted due to poor thermal conductivity and, therefore, opened broad windows of opportunities for polymer nanocomposites as emerging alternative replacements for metal components in various applications where effective heat dissipation is compulsory for device performance. Thus, this paper critically discusses globally emerging technologies applied in the development of thermally conductive polymer nanocomposites for various industrial applications.

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Discontinuous carbon fiber/polyamide composites with microencapsulated paraffin for thermal energy storage

Fredi

Dorigato

Unterberger³

et al. 2018

J of Applied Polymer Sci

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This work focuses on the development of multifunctional thermoplastic composites with thermal energy storage capability. A polyamide 12 (PA12) matrix was filled with a phase change material (PCM), constituted by paraffin microcapsules (Tmelt = 43 °C), and reinforced with carbon fibers (CFs) of two different lengths (chopped/CF “long”[CFL] and milled/CF “short” [CFS]). DSC tests showed that the melting/crystallization enthalpy values increase with the PCM weight fraction up to 60 J/g. The enthalpy was 41–94% of the expected value and decreased with an increase in the fiber content, because the capsules were damaged by the increasing viscosity and shear stresses during compounding. Long CFs increased the elastic modulus (+316%), tensile strength (+26%), and thermal conductivity (+54%) with respect to neat PA12. Thermal imaging tests evidenced a slower cooling for the samples containing PCM, and once again the CFS‐containing samples outperformed those with CFL, due to the higher effective PCM content. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47408.

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Phase change materials based on high-density polyethylene filled with microencapsulated paraffin wax

Cited by 80 publications

References 29 publications

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

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

Recently emerging trends in thermal conductivity of polymer nanocomposites

Discontinuous carbon fiber/polyamide composites with microencapsulated paraffin for thermal energy storage

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