Investigation of unbranched, saturated, carboxylic esters as phase change materials

Stamatiou, Anastasia; Obermeyer, Melissa; Fischer, Ludger; Schuetz, Philipp; Worlitschek, Jörg

doi:10.1016/j.renene.2017.02.056

Cited by 50 publications

(26 citation statements)

References 13 publications

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“…In this case, ∆ fus S is higher for the mixture but ∆ fus H is in proportion to the composition, and therefore (Equation 1), T fus is depressed, as observed. Stamatiou et al 34 examined linear fatty esters for use as PCMs. They showed that both T fus and ∆ fus H had strong positive correlations with the molar mass of the ester.…”

Section: R a F Tmentioning

confidence: 99%

Molecular structure and melting: implications for phase change materials

2018

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Phase change materials (PCMs) offer a promising technology for thermal energy storage, load leveling, and peak shifting applications. A desirable PCM has a melting temperature within the temperature boundaries of its application and a high change in enthalpy on melting. Knowledge of the relationships between these thermodynamic properties and molecular structure would advance informed selection of PCM candidates for a given application. In the present investigation, the relationship between structure (length of alkyl chains) and melting properties has been investigated for isomeric esters, showing that esters containing longer individual alkyl chains have higher melting temperatures and higher enthalpy changes on melting. The melting entropy changes, however, are relatively independent of the alkyl chain distribution.

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Section: R a F Tmentioning

confidence: 99%

Molecular structure and melting: implications for phase change materials

2018

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“…Up to the present date, some organic compounds, such as esters, n ‐alkanes, paraffins, and polyethylene glycol (PEG), have been employed in PCM applications. Materials with PCM properties usually exhibit a wide range of phase transition enthalpies ( ΔH m ∼ 150–250 and Jg −1 ≈ 168.75–281.25 kJ/L for organic compounds) near a particular operating temperature (Figure ), excellent thermal stability between 250 and 430 °C, and a long‐term reliability during repeated cycling .…”

Section: Introductionmentioning

confidence: 99%

Thermal and dynamic mechanical properties of polyethylene glycol/quartz composites for phase change materials

Fauziyah

Hilmi

Zainuri

et al. 2019

J of Applied Polymer Sci

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Polyethylene glycol (PEG)/quartz (denoted as BP/Q) composites have been investigated as candidates of phase change materials (PCMs) due to their thermomechanical properties around the glass transition temperature as well as thermal properties between 30 and 600 C. Quartz (q-SiO 2 ) powders were extracted from local sand in Tanah Laut, Pelaihari, South Kalimantan, Indonesia. The composites were prepared by dispersing q-SiO 2 powders in the PEG matrix followed by the wet mixing process. The thermal properties of the composites were characterized using differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA), while the thermomechanical properties were examined using a dynamic mechanical analyzer (DMA) in a three-point bending mode around the PEG glass transition temperature range (−100-50 C). The morphology and interface bonding were investigated using scanning electron microscopy (SEM) and transmission electron microscopy (TEM). From the DSC measurement, the endothermic peak of the composites showed a shift of approximately 7-12 C toward higher temperatures than that of the pure polymer. The melting enthalpy values (ΔH m ) of the BP/Q composites covered the required PCM application range, that is, between 139 and 182 J/g. The TGA of the composites showed that thermal degradation occurs in the range of 250-450 C. We found that solid-solid PCMs (ssPCMs) were successfully fabricated with the addition of 10 and 20 wt% q-SiO 2 . From DMA characterization, the BP/Q 20 wt% composite exhibited the maximum E' and the minimum energy dissipation (E"). Its E' value was approximately 250 MPa more than that of the pure PEG. The glass transition (T g ) temperatures of PEG and BP/Q composites (5, 10, and 20 wt%) were around −24.5, −19.1, −17.1, and − 5.3 C, respectively. In addition, the E" and tan δ values decreased with q-SiO 2 filler content. Furthermore, the Cole-Cole plots of the BP/Q composites revealed a better interfacial bonding between the q-SiO 2 and the PEG matrix in the composites with higher silica content. A compact morphology was shown by the BP/Q 20 wt% composite due to high silica concentration.

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“…They observed a high thermal stability with low supercooling rates and enthalpies of fusion of around 150 J/g in a low-mid temperature range between 20 and 32 • C. Sari et al [16] synthesized and studied esters from stearic acid with isopropanol, n-butanol, and glycerol, and obtained similar results. Other studies include those of Stamatiou et al [17], where the authors investigated 11 commercial saturated unbranched esters, and Ravotti et al [18,19], where 15 carboxylic fatty esters were synthesized and their thermal properties were characterized. In general, these authors measured enthalpies of fusion between 150 and 190 J/g in a temperature range of 10-50 • C, which would be suitable for low-mid temperature applications such as space heating.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Thermal Properties of Diesters from Methanol, 1-Pentanol, and 1-Decanol as Sustainable Phase Change Materials

et al. 2020

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Esters present several advantages when compared to traditional materials used for thermal energy storage, amongst which are better sustainability and greater chemical stability. However, at present, their thermal properties remain mostly unknown or not well documented. In this study, 12 diesters from four dicarboxylic acids (oxalic, succinic, suberic, sebacic) and three alcohols (methanol, 1-pentanol, 1-decanol) have been assessed as bio-based phase change materials for thermal energy storage. All diesters have been synthesized via Fischer esterification to high purities, and their chemical structures, as well as thermal properties, have been fully characterized. The diesters investigated show phase change transitions in a low-mid temperature range between −32 and 46 • C with maximum enthalpies of 172 J/g and show higher degrees of supercooling compared to fatty monoesters. Similarly to other esters classes, some trends correlating the chemical structures to the thermal properties were identified, which would allow for the development of property prediction tools.

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Investigation of unbranched, saturated, carboxylic esters as phase change materials

Cited by 50 publications

References 13 publications

Molecular structure and melting: implications for phase change materials

Molecular structure and melting: implications for phase change materials

Thermal and dynamic mechanical properties of polyethylene glycol/quartz composites for phase change materials

Investigation of the Thermal Properties of Diesters from Methanol, 1-Pentanol, and 1-Decanol as Sustainable Phase Change Materials

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