Synthesis and properties of microencapsulated phase change material with a urea–formaldehyde resin shell and paraffin wax core

Huo, Jin-hua; Peng, Zhigang; Feng, Qian

doi:10.1002/app.48578

Cited by 22 publications

(10 citation statements)

References 39 publications

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“…Although waste polyethylene wax and its blends have not been extensively studied in the literature, there are many studies regarding various other waxes and their blends with other material. [4][5][6][7] Paraffin wax has been used as model systems for polyethylene for studying electrical conductivity, and the conductivity of wax has been studied since 1932. 8 The blends of wax and polyethylene have drawn attention to themselves since they have many valuable properties such as lightweight, good processability, and low cost.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Morphology, phase diagram, and properties of high‐density polyethylene/thermally treated waste polyethylene wax blends

Esmaeilzade

Sharif

Rashedi

et al. 2021

J of Applied Polymer Sci

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Waste polyethylene wax is thermally treated using a rotary evaporator to reduce unwanted components. Fourier transform infrared proves the absence of undesirable material. Wax is extruded with high‐density polyethylene (HDPE) at various loadings to study its morphology and final properties. Scanning electron microscopy and differential scanning calorimeter were employed to obtain the phase diagram showing the immiscibility of blends containing more than 20 wt% of wax. Due to the low melting temperature of the wax and its plasticating effect on HDPE, a decrease in melting temperature, enthalpy of fusion, and crystallinity with increasing wax content of the blend is observed. The phase diagram displays four possible phases depending on temperature and wax loading. Improved processability of HDPE/wax blends is demonstrated using complex viscosity curves. Han plots prove the miscibility of wax and HDPE in the melt state even at high concentrations of wax. HDPE/wax compounds have lower crystallinity, and wax particles, acting as weak spots, lower the elastic modulus, yield stress, and stress and strain at break as wax content increases. An increase in yield strain is observed due to the more effortless extension of HDPE chains at higher wax content. In 10 wt% of wax is accepted as the upper limit for wax incorporation into the HDPE matrix.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Morphology, phase diagram, and properties of high‐density polyethylene/thermally treated waste polyethylene wax blends

Esmaeilzade

Sharif

Rashedi

et al. 2021

J of Applied Polymer Sci

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show abstract

“…The prepared micro-PCMs have a latent heat of approximately 121.42 J/g compared to the 179.57 J/g of pure PW. The latent heat of the micro-PCMs changed slightly because of the decrease in PW content in the core prepared with micro-PCMs [1,9,29,30,34]. Encapsulation ratio (ER) is one of the important parameters in the study of encapsulated phase change materials for TES.…”

Section: Dsc Analysis Of Micro-pcmsmentioning

confidence: 99%

Preparation of microencapsulated PCMs for energy saving and thermal comfort of buildings

Heniegal¹,

Ibrahim²,

Frahat³

et al. 2021

JUSST

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Energy improvement techniques for buildings are among the modern studies that concentrate on new techniques and methods of saving energy and improving the thermal performance in buildings. This research aims to prepare microencapsulated-PCMs (micro-PCMs) by using local materials and studied the influence of using micro-PCMs on thermal performance improvement and PCMs leakage problems improvement. The micro-PCMs of paraffin wax were prepared as the core PCMs materials while the melamine-formaldehyde polymer as the shell. The micro-PCMs were characterized through scanning electron-microscopy (SEM), energy-dispersive X-ray (EDX) spectrometry, Fourier-transform infrared spectroscopy, and differential scanning calorimetry. Analysis results showed the prepared micro-PCMs present a regular spherical shape and confirm that the formation composite of the shell effectively encapsulated the cores. Furthermore, the absence of chemical interaction between the MF and the PW components. The micro-PCM have potential for architectural applications in the building-envelope to store thermal energy, provide indoor-temperature at the comfortable range, and reduce the consumption energy in buildings.

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“… 9 , 10 However, like other organic PCMs, PA has defects such as low thermal conductivity and leakage during phase change, which limits its popularization in thermal energy storage applications. 11 …”

Section: Introductionmentioning

confidence: 99%

Preparation and Performance Analysis of Form-Stable Composite Phase Change Materials with Different EG Particle Sizes and Mass Fractions for Thermal Energy Storage

Chen

et al. 2022

ACS Omega

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The low thermal conductivity and leakage of paraffin (PA) limit its wide application in thermal energy storage. In this study, a series of form-stable composite phase change materials (CPCMs) composed of PA, olefin block copolymer (OBC), and expanded graphite (EG) with different particle sizes (50 mesh, 100 mesh, and 200 mesh) and mass fractions are prepared by melt blending. OBC as a support material could reduce PA leakage during melting, and EG as a thermally conductive filler can improve the thermal performance of PCMs. The microstructure characteristics and chemical and thermal properties of prepared CPCMs are tested and analyzed. The results show that PA/OBC and EG have good compatibility, and there is no chemical reaction with each other to generate new substances. Thermal conductivity can be significantly improved by adding EG, and it is greatly enhanced with the increase in EG particle size at the same EG mass fraction. Simultaneously, the addition of EG increased the melting temperature of CPCMs and decreased the solidification temperature as well; meanwhile, the values of melting temperature and solidification are also reversed for CPCMs compared to PA/OBC. There is an optimal content of EG to balance the thermal conductivity and heat storage capacity for CPCMs. The addition of OBC can provide a stable geometric construction, and the leakage will be further improved with the increase in EG content. Finally, the melting time of CPCMs containing EG-50, EG-100, and EG-200 with 4 wt % EG is shortened by 52.9, 41.1, and 37.5%, respectively, compared with PCMs without EG in the heat storage and release experiments. Also, the CPCMs with EG-50 have better thermal performance compared with the CPCMs of EG-100 and EG-200.

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Synthesis and properties of microencapsulated phase change material with a urea–formaldehyde resin shell and paraffin wax core

Cited by 22 publications

References 39 publications

Morphology, phase diagram, and properties of high‐density polyethylene/thermally treated waste polyethylene wax blends

Morphology, phase diagram, and properties of high‐density polyethylene/thermally treated waste polyethylene wax blends

Preparation of microencapsulated PCMs for energy saving and thermal comfort of buildings

Preparation and Performance Analysis of Form-Stable Composite Phase Change Materials with Different EG Particle Sizes and Mass Fractions for Thermal Energy Storage

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