Phase change materials based on polyethylene glycol supported by graphene-based mesoporous silica sheets

Zhang, Li; Zhang, Ping; Wang, Feng; Kang, Ming; Li, Rongqiu; Mou, Yongren; Huang, Yuhong

doi:10.1016/j.applthermaleng.2016.02.120

Cited by 52 publications

(14 citation statements)

References 32 publications

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“…Several studies reported the production of form-stable PCMs based on PEG [ 23 , 24 , 25 , 26 ]. Among other advantages, a low leakage of PEG from the porous support was observed during its phase-change process [ 19 , 27 , 28 ], along with thermal stability and good LHTES. A form-stable PCM is generally obtained by impregnating an inert matrix, such as diatomite, acetylene black, expanded graphite, or expanded vermiculite.…”

Section: Introductionmentioning

confidence: 99%

Physical Properties of an Eco-Sustainable, Form-Stable Phase Change Material Included in Aerial-Lime-Based Mortar Intended for Different Climates

2022

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The aim of this experimental investigation was to produce a form-stable phase change material (PCM) able to reduce the need for nonrenewable energy resources required for the heating/cooling of buildings located in regions characterized by different climatic conditions. The innovative PCM must also be sustainable and must be produced according to the principles of the circular economy. To achieve such ambitious goals, a form-stable, sustainable PCM was produced through vacuum impregnation. The form-stable PCM was produced starting from a low-toxicity, low-flammability polyethylene glycol of medium molecular weight (PEG 800), which was included in porous stone granules obtained as waste products of the cutting/processing of local (Lecce) stone. The thermal properties and thermal stability of PEG 800 and of its PCM-composite were evaluated by employing differential scanning calorimetry (DSC) and thermo-gravimetric analysis (TGA). The appropriate parameters to perform the impregnation procedure were identified through rheological and calorimetric analyses. A simple leakage test was performed to assess if the PEG polymer can leak from the stone flakes. Finally, the new PCM was added as an aggregate in aerial-lime-based mortars, and the mortar’s properties were analyzed in fresh (workability) and hardened (flexural and compressive strength and thermal characteristics) states for potential applications, particularly in ancient buildings.

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Section: Introductionmentioning

confidence: 99%

Physical Properties of an Eco-Sustainable, Form-Stable Phase Change Material Included in Aerial-Lime-Based Mortar Intended for Different Climates

2022

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“…Among the organic PCMs, polyethylene glycol (PEG) is a very good candidate due to its highly desirable features. Phase transition temperature and high heat storage capacity [5] of PEG, which can be controlled by changing its molecular weight and/or mass fraction, are very favorable for PCM applications. Exceptional resistance to corrosion, good chemical and thermal stability, non-toxicity, low vapor pressure, and low cost [6] are some of the other unique properties of PEG.…”

Section: Introductionmentioning

confidence: 99%

Shape-Stabilized Phase Change Materials for Solar Energy Storage: MgO and Mg(OH)2 Mixed with Polyethylene Glycol

et al. 2019

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Heat energy storage systems were fabricated with the impregnation method using MgO and Mg(OH)2 as supporting materials and polyethylene glycol (PEG-6000) as the functional phase. MgO and Mg(OH)2 were synthesized from the salt Mg(NO3)·6H2O by performing hydrothermal reactions with various precipitating agents. The precipitating agents were NaOH, KOH, NH3, NH3 with pamoic acid (PA), or (NH4)2CO3. The result shows that the selection of the precipitating agent has a significant impact on the crystallite structure, size, and shape of the final products. Of the precipitating agents tested, only NaOH and NH3 with PA produce single-phase Mg(OH)2 as the as-synthesized product. Pore size distribution analyses revealed that the surfaces of the as-synthesized MgO have a slit-like pore structure with a broad-type pore size distribution, whereas the as-synthesized Mg(OH)2 has a mesoporous structure with a narrow pore size distribution. This structure enhances the latent heat of the phase change material (PCM) as well as super cooling mitigation. The PEG/Mg(OH)2 PCM also exhibits reproducible behavior over a large number of thermal cycles. Both MgO and Mg(OH)2 matrices prevent the leakage of liquid PEG during the phase transition in phase change materials (PCMs). However, MgO/PEG has a low impregnation ratio and efficiency, with a low thermal storage capability. This is due to the large pore diameter, which does not allow MgO to retain a larger amount of PEG. The latent heat values of PEG-1000/PEG-6000 blends with MgO and Mg(OH)2 were also determined with a view to extending the application of the PCMs to energy storage over wider temperature ranges.

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“…TG-FTIR was an effective method to detect gaseous products in the process of polymer combustion. 41,42 The TG-FTIR 3D spectra of RPUF and FR-RPUF composites was showed in Figure 6. As shown in the figure, the gas product peaks generated by the degradation of FR-RPUF composites were mainly distributed in the bands of 3700-3800 cm À1 , 2800-3050 cm À1 , 2200-2400 cm À1 , 1500-1800 cm À1 , and 950-1300 cm À1 .…”

Section: Gas-phase Products Of Rpuf and Fr-rpuf Compositesmentioning

confidence: 99%

Flame retardant rigid polyurethane foam composites based on iron tailings and aluminum phosphate: A novel strategy for utilizing industrial solid wastes

Yang

Zhang

et al. 2021

Polymers for Advanced Techs

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To widen the application field of iron tailings (ITs) and explore ITs potential use-value, ITs and aluminum phosphate (AHP) were introduced to prepare flame-retardant rigid polyurethane foam (FR-RPUF) composites. The chemical composition and mineral composition of ITs were investigated by X-ray diffraction, X-ray fluorescence. The flame retardancy, thermal stability, combustion performance and gas-phase products of FR-RPUF composites were investigated by limiting oxygen index, underwriters laboratories vertical burning test (UL-94), thermogravimetry (TG), cone calorimetry and thermogravimetric-infrared spectrometry (TG-FTIR). TG confirmed that ITs could effectively improve the thermal stability of FR-RPUF composites at high temperature.Cone calorimetry implied that ITs could significantly reduce heat release and toxic smoke release and thus improve the fire safety of the composites. TG-FTIR indicated that ITs effectively reduced the release intensity of hydrocarbons, aromatic compounds, CO, isocyanates and esters. Scanning electron microscope and Raman spectra showed ITs could improve the compactness and graphitization degree of the char residues for FR-RPUF composites.

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Phase change materials based on polyethylene glycol supported by graphene-based mesoporous silica sheets

Cited by 52 publications

References 32 publications

Physical Properties of an Eco-Sustainable, Form-Stable Phase Change Material Included in Aerial-Lime-Based Mortar Intended for Different Climates

Physical Properties of an Eco-Sustainable, Form-Stable Phase Change Material Included in Aerial-Lime-Based Mortar Intended for Different Climates

Shape-Stabilized Phase Change Materials for Solar Energy Storage: MgO and Mg(OH)2 Mixed with Polyethylene Glycol

Flame retardant rigid polyurethane foam composites based on iron tailings and aluminum phosphate: A novel strategy for utilizing industrial solid wastes

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