Effect of expanded graphite surface modification on phase change materials nanocomposites thermal protection efficiency

Abdeali, Golnoosh; Mazaheri, Kimia; Ahmadi, Leila; Bahramian, Ahmad Reza

doi:10.1002/pc.26512

Cited by 11 publications

(6 citation statements)

References 31 publications

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“…The results also confirm that EG plays a very positive role in improving the shape stability of phase change composites. This can be attributed to the capillary force and surface tension resulting from the three-dimensional porous structure of EG. , …”

Section: Resultsmentioning

confidence: 99%

“…This can be attributed to the capillary force and surface tension resulting from the three-dimensional porous structure of EG. 27,46 The thermal stability of the composites was analyzed by TGA. As seen from Figure 6c, the degradation of PW starts at about 270 °C and completes at about 390 °C, while the degradation of SEBS occurs over 390 °C.…”

Section: Shape Stability and Thermal Stabilitymentioning

confidence: 99%

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Flexible and Form-Stable Phase Change Composites Enabled by Pinecone-like Structure for Efficient Thermal Management

Wang,

Jia,

Liu

et al. 2023

ACS Appl. Polym. Mater.

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Phase change materials (PCMs) have become some of the most promising materials in thermal management systems. However, in practice, they are inevitably restricted by the issues of low thermal conductivity, liquid leakage, and strong rigidity. Herein, a flexible and form-stable phase change composite (PEA) with a pinecone-like structure is fabricated by a facile and scalable approach. In the PEA composite, paraffin wax (PW) is employed as PCM, styrene-b-(ethylene-co-butylene)-b-styrene triblock copolymer (SEBS) is used as the supporting skeleton, Vaseline is used to reduce hardness, and expanded graphite (EG) and aluminum (Al) powders are used to enhance thermal conductivity. The pinecone-like EG-Al powder architecture exhibits more efficient heat transfer performance. The thermal conductivity of PEA-5 composite can reach 5.09 W m–1 K–1, which is 28 times that of the matrix. In addition, the PEA-5 composite has good shape stability and thermal stability as well as excellent heat dissipation capability in LED modules. Interestingly, the PEA-5 composite also shows superior Joule heating performance with a saturated temperature up to 112.1 °C at an applied voltage of 3.5 V. This work provides insight for the rational design of highly thermally conductive and form-stable phase change composites, showing great potential for application in thermal management.

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Section: Resultsmentioning

confidence: 99%

Section: Shape Stability and Thermal Stabilitymentioning

confidence: 99%

Flexible and Form-Stable Phase Change Composites Enabled by Pinecone-like Structure for Efficient Thermal Management

Wang,

Jia,

Liu

et al. 2023

ACS Appl. Polym. Mater.

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show abstract

“…There are three distinct strategies, physical adsorption is the simplest and most convenient method for resolving the liquid leakage issue. Abdeali 6 modified expanded graphite surface using toluene‐2,4‐diisocyanate, ethylene glycol, and PEG1000, and the porous structure of the EG, as well as the chemical interactions caused by the presence of the surface agents, largely reduced PCM melt leakage (10%).Wang et al 7 used wood flour as a carrier for eutectic PEG, the leakage rate can be effectively lowered to only 1.1% due to the porous structure of wood flour. However, the leakage problem of PCMs cannot be completely solved due to the semi‐enclosed pore structure.…”

Section: Introductionmentioning

confidence: 99%

An energy storage composite using cellulose grafted polyethylene glycol as solid–solid phase change material

Guo,

Jiang,

Qiu

et al. 2023

Polymer Composites

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Phase‐change material (PCM) has great thermal energy ability, which has been used as building material for energy conservation. While the most widely used solid–liquid PCM usually appeared leakage during the phase change transition. In order to overcome the leakage of solid–liquid PCM and prepare a viable building energy‐saving materials for indoor temperature regulation, thermal energy storage composites were prepared by utilizing cellulose grafted PEG as phase change material (PCM) and high‐density polyethylene (HDPE) as the substrate. The liquid leakage of PEG was solved after graft to fabricate solid–solid PCM. HDPE is beneficial for solving the leakage and improving the mechanical property by its secondary encapsulation. The synthesized Cellulose‐PEG was characterized by scanning electron microscopy (SEM), X‐ray diffractometer (XRD), and differential scanning calorimetry (DSC). Thermal and mechanical characteristics of the composite were explored. The outcomes revealed that: (1) PEG was successfully grafted to the surface of cellulose and Cellulose‐PEG showed solid–solid phase change behavior. (2) Both the melting‐cooling temperatures and the thermal stability of solid–solid wood plastic composite (SSWPC) had the potential as thermal energy storage material for temperature regulating. (3) The addition of Cellulose‐PEG adversely affected moisture resistance, flexural property, and impact strength due to the weak interface bonding. The physical and mechanical degradation was tolerable for applying situation where mechanical performance is less crucial.Highlights Cellulose‐PEG showed solid–solid phase change behavior without liquid leakage. High‐density polyethylene (HDPE) was used as the matrix to realize the second encapsulation of PCM. Cellulose‐PEG negatively influenced the physical and mechanical property of HDPE. Solid–solid wood plastic composite presented great thermal storage capacity for indoor temperature regulating.

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“…28 Phase change materials (PCMs) are innovative materials that efficiently absorb and release a significant amount of energy during phase transformation, serving for temperature regulation and energy storage. [29][30][31] Polyethylene glycol (PEG) is a well-known kind of PCMs, which emerges as a highly promising solid-liquid PCM due to its exceptional qualities, such as low vapor pressure, excellent chemical and thermal stability, appropriate phase transition temperature, lack of supercooling, and nontoxic nature. [32][33][34] PEG also exhibits some drawbacks which would limits its practical applications.…”

Section: Introductionmentioning

confidence: 99%

Preparation of a thermally conductive phase‐change coating with good anti‐corrosion

Hu,

Li,

et al. 2023

Polymer Composites

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Polyethylene glycol (PEG) is a widely available and environmentally friendly phase change material known for its high energy storage capacity. However, its application in various industries is limited due to slow heat absorption and release, poor mechanical properties, and inadequate weather resistance. PEG was blended with waterborne epoxy resin (WER) to improve its mechanical properties and weather resistance. Furthermore, graphene nanoplatelets (GNPs) and boron nitride (BN) were incorporated into the WER/PEG resin substrate to prepare WER/PEG/BN@GNP coatings, resulting in enhanced thermal conductivity. When the GNP content was 0.5 wt%, the WER/PEG/BN@GNP coatings performed excellent anti‐corrosion. Otherwise, the leakage of PEG under heat‐cool cycling was addressed by the preparation of WER/PEG/BN@GNP coatings, as well as the low rates of heat absorption and release. In this work, the preparation method successfully combines the phase‐change characteristics of PEG, the outstanding mechanical properties of WER, and the high thermal conductivity of BN and GNP. The WER/PEG/BN@GNP coatings present significant potential for practical applications.Highlights A new coating is prepared by incorporation of BN/GNP into PEG/WER matrix. The prepared coating performs phase change and good heat conduction efficiency. The phase‐transition leakage of PEG is resolved by the combination with WER. The synergy of BN and GNP fillers can enhance thermal conductivity effectively. The prepared coating exhibits insulation and anti‐corrosion at low GNP content.

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Effect of expanded graphite surface modification on phase change materials nanocomposites thermal protection efficiency

Cited by 11 publications

References 31 publications

Flexible and Form-Stable Phase Change Composites Enabled by Pinecone-like Structure for Efficient Thermal Management

Flexible and Form-Stable Phase Change Composites Enabled by Pinecone-like Structure for Efficient Thermal Management

An energy storage composite using cellulose grafted polyethylene glycol as solid–solid phase change material

Preparation of a thermally conductive phase‐change coating with good anti‐corrosion

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