Polyethylene glycol-enwrapped silicon carbide nanowires network/expanded vermiculite composite phase change materials: Form-stabilization, thermal energy storage behavior and thermal conductivity enhancement

Deng, Yong; Li, Jinhong; Nian, Hongen

doi:10.1016/j.solmat.2017.09.013

Cited by 87 publications

(33 citation statements)

References 49 publications

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“…Stretching vibrations of C=O were observed at 1,112 cm −1 . The peak at 1,468 cm −1 corresponds to the bending vibration peak of –CH 2 – . The main absorption peaks of PEG appeared as predicted and did not shift in the spectra of PCC35 and PMCC.…”

Section: Resultssupporting

confidence: 63%

Thermally Conductive and Shape‐Stabilized Polyethylene Glycol/Carbon Foam Phase‐Change Composites for Thermal Energy Storage

et al. 2020

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Phase‐change materials (PCMs) have been widely investigated as candidates for thermal energy storage and solar thermal energy conversion. However, low thermal conductivity and poor shape stability during phase transition processes are detrimental to their practical applications. In this study, we designed composite PCMs based on carbon foam (CF) via the vacuum impregnation method to overcome these problems. CF with 3D interconnected microporous structures and good compressive strength was fabricated from phenolic resin (PF) using a combined process of carbonization and sacrificial template techniques. The developer material is considered a promising support material for PCMs. The as‐prepared polyethylene glycol/CF composite (PCC) exhibited a high energy‐storage density with a melting enthalpy of 135.7 J/g, and the thermal conductivity was enhanced by 109.8% compared to that of pure polyethylene glycol. In addition, the PCC showed excellent thermal stability and leakage‐proof performance after 100 heating/cooling cycles and good compressive strength. Because of the simple preparation process and low cost, PCC is a promising material for various thermal energy storage applications, especially in building energy storage systems.

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Section: Resultssupporting

confidence: 63%

Thermally Conductive and Shape‐Stabilized Polyethylene Glycol/Carbon Foam Phase‐Change Composites for Thermal Energy Storage

et al. 2020

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“…PCE5.20C was obtained after the PCE5.20 was heated and cooled 100 times between 0 and 70 °C at a rate of 20 °C/min. Compared with the adsorption capacity of PCE-CPCMs without CNTs (68.59 wt %) [23], the PCE1.59, PCE3.30, PCE5.20, and PCE7.09 reached 77.75, 79.31, 81.53, and 81.54 wt %, respectively, and the corresponding weight fractions of CNTs were 1.59, 3.30, 5.20, and 7.09 wt %, respectively. Usually, the adsorption capacity of composite PCMs decreases with increasing thermal conductivity enhancement filler content.…”

Section: Methodsmentioning

confidence: 99%

Polyethylene Glycol-Carbon Nanotubes/Expanded Vermiculite Form-Stable Composite Phase Change Materials: Simultaneously Enhanced Latent Heat and Heat Transfer

Deng

et al. 2018

Polymers

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Polyethylene glycol (PEG)-carbon nanotubes (CNTs) with expanded vermiculite (EVM) form-stable composite phase change materials (PCE-CPCMs) were constructed via the efficient synergistic effect between EVM and CNTs. The resultant material demonstrated simultaneously enhanced latent heat and heat transfer. The unique EVM pore structure and CNTs surfaces contributed to the form stability of PCE-CPCMs. The adsorption capacity was 77.75–81.54 wt %. The latent heat of the PCE-CPCMs increased with increasing CNTs content due to the decreasing inhibition effect of EVM and the increasing adsorption capacity of PEG, which was 83.9 J/g during melting and 104.2 J/g during solidification for PCE7.09. The pore confinement and surface EVM interactions inhibited the heat storage capacity of the PCE-CPCMs. Moreover, the inhibition effect on the heat storage capacity of PCE-CPCMs during the melting process was stronger than during solidification due to the crystallization-promoting effect. The heat transfer of PCE-CPCMs was significantly enhanced by the CNTs filler (0.5148 W/(m·K) for PCE7.09) due to the decrease in interfacial thermal resistance and the formation of rapid thermally conductive pathways. Fourier transform infrared spectroscopy, thermogravimetric analysis, and thermal cycles test results confirmed that the PCE-CPCMs exhibited excellent chemical compatibility, thermal stability, and reliability.

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“…PEG is used in its bulk form, which undergoes solid–liquid phase transition, or in shape‐stabilized form, which undergoes solid–solid phase transition to avoid leakage. Various porous material can act as form stabilizer, such as porous carbon materials, clay mineral, and mesoporous matrices, to prepare shape stabilized (ie, form stable) PEG PCMs. Another way for preparation of PEG‐based form‐stable PCMs (FSPCMs) is chemical crosslinking …”

Section: Introductionmentioning

confidence: 99%

End group modification of polyethylene glycol (PEG): A novel method to mitigate the supercooling of PEG as phase change material

et al. 2018

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Summary Polyethylene glycol (PEG) is a kind of phase change material with high phase change enthalpy and good compatibility with the environment. However, there is relatively large supercooling for PEG, limiting their practical applications. To reduce their supercooling degree, herein we use three different small molecules (acryloyl chloride, acetyl chloride, and thionyl chloride) to modify PEG and study the effects of different end group modification on their phase change properties. Fourier‐transform infrared (FTIR) and proton nuclear magnetic resonance (1H‐NMR) spectroscopy are used to confirm the molecular structure of the PEG with different molecular weights and functionalities after chemical modification. Crystal structures of the PEG before and after the modification are verified by X‐ray diffractometry (XRD) method and show no change. Differential scanning calorimetry (DSC) results show that the end group modification is quite effective for mitigating the supercooling of PEG with double ‐OH end groups but not effective for PEG with mono ‐OH end group. The mechanism for the change of supercooling behavior is proposed. The costs of different modification methods are estimated and compared.

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Polyethylene glycol-enwrapped silicon carbide nanowires network/expanded vermiculite composite phase change materials: Form-stabilization, thermal energy storage behavior and thermal conductivity enhancement

Cited by 87 publications

References 49 publications

Thermally Conductive and Shape‐Stabilized Polyethylene Glycol/Carbon Foam Phase‐Change Composites for Thermal Energy Storage

Thermally Conductive and Shape‐Stabilized Polyethylene Glycol/Carbon Foam Phase‐Change Composites for Thermal Energy Storage

Polyethylene Glycol-Carbon Nanotubes/Expanded Vermiculite Form-Stable Composite Phase Change Materials: Simultaneously Enhanced Latent Heat and Heat Transfer

End group modification of polyethylene glycol (PEG): A novel method to mitigate the supercooling of PEG as phase change material

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