Polystyrene microcapsules with palmitic-capric acid eutectic mixture as building thermal energy storage materials

Döğüşcü, Derya Kahraman; Altıntaş, Ayşe; Sarı, Ahmet; Alkan, Cemil

doi:10.1016/j.enbuild.2017.06.022

Cited by 70 publications

(11 citation statements)

References 36 publications

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“…The encapsulation efficiency was calculated from the ratio of latent heat of fusion of M‐PCMs and eutectic mixture and was found to be 85.30%. The latent heat capacity of the synthesized microencapsulated PCMs was compared with previously developed PCMs (Table ).…”

Section: Resultsmentioning

confidence: 99%

“…27,28 The encapsulation efficiency was calculated from the ratio of latent heat of fusion of M-PCMs and eutectic mixture and was found to be 85.30%. The latent heat capacity of the synthesized microencapsulated PCMs was compared with previously developed PCMs 14,15,[27][28][29][30][31][32][33][34] (Table 1). The changes in melting and freezing temperatures of M-PCMs with DSC curves were shown in Figure 6.…”

Section: Differential Scanning Calorimetric Of Eutectic Mixture Andmentioning

confidence: 99%

“…The eutectic mixture made up of fatty acids is more superior to the rest of materials because of ease of preparation, sharp melting process, no phase segregation, and super cooling. The eutectic mixtures that are used as core during microencapsulation process in the previous studies are butyl stearate, PA‐capric acid (CA), stearic acid (SA)‐CA, n‐alkanes, capric‐palmitic‐stearic acid (CPSA), polymer SiO 2 /TiC hybrid shell, SA‐eicosanoic acid (EA), binary carbonate salt, and strontium titanate‐MA …”

Section: Introductionmentioning

confidence: 99%

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Microencapsulation of a eutectic PCM using in situ polymerization technique for thermal energy storage

et al. 2020

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Summary In the present work, microencapsulated phase change material (M‐PCM) has been synthesized with eutectic mixture (75% SA + 25% CA) as core and melamine formaldehyde (MF) as shell using in situ polymerization. Advanced instrumental techniques like field emission scanning electron microscopy (FE‐SEM), Fourier‐transform infrared spectroscopy (FT‐IR), particle size analyzer (PSA), thermogravimetric/differential thermal analysis (TG/DTA), differential scanning calorimetry (DSC), and thermal conductivity analyzer (TCi) were used to characterize the synthesized M‐PCM, and impact of effective parameters like pH and agitator speed on the encapsulation process was also elucidated. Results obtained reveal that at the optimized pH (3.2) and agitator speed (1500 rpm) M‐PCM possess smooth surface morphology, spherical in shape with particle size of 10.41 μm. Based on FT‐IR analysis, it was observed that the synthesized M‐PCM was uniformly encapsulated by MF resin with eutectic mixture in the core. The encapsulation process results in the improvement of the thermal stability of eutectic mixture, it increases from 202.5 to 212.3°C, and the encapsulation efficiency of the M‐PCM is found to be 85.3%. The melting point and latent heat of fusion of M‐PCM were found to be 34.5°C and 103.9 kJ/kg, respectively.

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Section: Resultsmentioning

confidence: 99%

Section: Differential Scanning Calorimetric Of Eutectic Mixture Andmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Microencapsulation of a eutectic PCM using in situ polymerization technique for thermal energy storage

et al. 2020

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“…Microencapsulation of phase change materials (MEPCMs) is a process of coating PCM droplets with a shell to form microcapsules with diameters of nano‐ to micrometers. So far, many materials have been developed as shell materials to prepare microencapsulated PCMs, including inorganic materials, such as SiO 2 , TiO 2 , and CaCO 3 ; polymers, such as polyurethane, polystyrene, melamine resin, and acrylic; and biomacromolecules, such as silk fibroin, ethyl cellulose, and arabic gum . Melamine resin and acrylic polymers have been the most‐studied shell materials.…”

Section: Introductionmentioning

confidence: 99%

Efficient preparation and characterization of paraffin‐based microcapsules by emulsion polymerization

Yang

2019

J of Applied Polymer Sci

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Microencapsulated phase-change materials (MEPCMs) with paraffin as the core and poly(methyl methacrylate) (PMMA) and PMMA copolymers as the shell were prepared by emulsion polymerization using redox initiators at low temperatures. Fourier transform infrared spectroscopy was used to characterize the chemical composition of MEPCMs. The thermal properties and thermal stabilities of MEPCMs were tested by differential scanning calorimetry and thermogravimetric analysis. The morphologies and sizes of the microcapsules were investigated by scanning electron microscopy and particle size distribution analysis. The results indicated that the yield of microcapsules is as high as 96.2%, and the encapsulation efficiency of paraffin is nearly 100% when the paraffin content in MEPCM is 70%. The MEPCMs have good stability: the leakage ratios of MEPCMs can be less than 1% after 50 heating-cooling cycles. Therefore, the microencapsulation of paraffin using redox initiators has good production and application prospects.

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“…The latent heats of PCMs with stearic acid percentage of 52.20 wt% are 102.1 and 102.8 J/g at 55.3 and 48.8˚C, respectively [7].Döğüşcü et alinvestigated palmitic acid (PA) and capric acid (CA) eutectic composition ratio of the mixture. Thephasechange temperatures and latent enthalpies of PCMs were determined using DSC found between 13.5-17.9˚C and 45.0-77.3 J/g, respectively [8]. Among fatty acids, stearic acid has a suitable phase change materials.Literature survey shows that the thermal characteristics of stearic acid and its esters indicated available for heat storage in buildings [9].…”

Section: Introductionmentioning

confidence: 99%

Preparation of Stearic Acid/Graphene oxide Based Form-Stable Composite Phase Change Materials

Oktay

2018

Marmara Fen Bilimleri Dergisi

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Composite phase change materials (PCM) of stearic acid/graphene oxide were prepared by thiol-alkyne click coupling reaction.Stearic acid was firstly modified with propargyl to introduce thiol-yneclickable sites. Different amounts of graphene oxide were added to thiol-alkyne clickable formulation. To evaluate phase change properties of PCMs differential scanning calorimeter (DSC) was used. Thermal stability and degradation profiles of PCMs were investigated. The structural characterization of stearic propargyl ester and PCMs was performed by ATR-FTIR spectroscopy. The addition of graphene oxide increased the maximum weigh loss temperature from 328 to 351 ˚C with respect to the base formulation. Moreover, the crosslinking of stearic acid prevented the leakage of PCMs. Keywords: Phase change materials, thiol-yne click, graphene oxide ÖzStearik asit-grafen oksit kompozit faz değişim malzemeleri (PCM) tiyol-alkin klik kapanma reaksiyonu ile hazırlandı. Öncelikle stearik asit tiyol-yne klik gruplarının bağlanması amacıyla modifiye edildi. Farklı miktarlarda grafen oksit tiyol-klik formülasyonuna eklendi. PCM'lerin faz değişim özelliklerini incelemek için diferansiyel taramalı kalorimetre (DSC) kullanıldı. PCM'lerin termal kararlılık ve bozunma profil incelendi. Stearik propargyl esteri ve PCM'lerin yapısal karakterizasyonu ATR-FTIR spektroskopisi ile gerçekleştirildi. Grafen oksit eklenmesiyle baz formülasyona göre maksimum kütle kaybı sıcaklığı 328 dan 351 ˚C ye yükseldi. Aynı zamanda stearik propargyl çapraz bağlanmasıyla PCM'lerin akma problem engellendi.

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Polystyrene microcapsules with palmitic-capric acid eutectic mixture as building thermal energy storage materials

Cited by 70 publications

References 36 publications

Microencapsulation of a eutectic PCM using in situ polymerization technique for thermal energy storage

Microencapsulation of a eutectic PCM using in situ polymerization technique for thermal energy storage

Efficient preparation and characterization of paraffin‐based microcapsules by emulsion polymerization

Preparation of Stearic Acid/Graphene oxide Based Form-Stable Composite Phase Change Materials

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