Preparation, Morphology and Properties of Electrospun Lauric Acid/PET Form-Stable Phase Change Ultrafine Composite Fibres

2011 ◽  
Vol 19 (9) ◽  
pp. 773-780 ◽  
Author(s):  
Yibing Cai ◽  
Huizhen Ke ◽  
Tingting Zhang ◽  
Ju Dong ◽  
Hui Qiao ◽  
...  
Keyword(s):  
Phase Change ◽  
Lauric Acid ◽  
Phase Change Materials ◽  
Fibre Diameter ◽  
Stable Phase ◽  
Uniform Structure ◽  
Cylindrical Shape ◽  
Scanning Calorimetry ◽  
Average Fibre Diameter ◽  
Dsc Measurements

Lauric acid (LA)/polyethylene terephthalate (PET) ultrafine composite fibres as form-stable phase change materials (PCM) were prepared successfully via electrospinning. The morphology, thermal energy storage properties, thermal stability and flammability properties of electrospun LA/PET composite fibres were characterized by scanning electron microscopy (SEM), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA) and microscale combustion calorimetry (MCC), respectively. It was found by SEM investigation that the average fibre diameter generally increased with increasing content of LA in the LA/PET composite fibres. The morphology of electrospun composite fibres changed from a cylindrical shape with a smooth surface (without LA) to a rough and non-uniform structure (with LA). The DSC measurements indicated that there was little change of the phase transition temperatures of the composite fibres, but there was a decrease of the heat enthalpies compared with the pure lauric acid. The TGA results showed that both the onset thermal degradation temperature and charred residue at 700 °C of composite fibres were lower than those of the pure PET fibres, due to the thermal instability of LA. The MCC tests showed that there were two peaks of heat release rate, which corresponded respectively to combustion of LA and PET in the electrospun composite fibres. It could be also found that the first peak increased and the second peak decreased with increasing LA content in composite fibres.

scholarly journals pH-controlled synthesis of sustainable lauric acid/SiO2 phase change material for scalable thermal energy storage

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Shafiq Ishak ◽  
Soumen Mandal ◽  
Han-Seung Lee ◽  
Jitendra Kumar Singh
Keyword(s):  
Electron Microscopy ◽  
Phase Change ◽  
Lauric Acid ◽  
Photoelectron Spectroscopy ◽  
Phase Change Materials ◽  
Precursor Solution ◽  
Thermal Reliability ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Heating And Cooling

AbstractLauric acid (LA) has been recommended as economic, eco-friendly, and commercially viable materials to be used as phase change materials (PCMs). Nevertheless, there is lack of optimized parameters to produce microencapsulated PCMs with good performance. In this study, different amounts of LA have been chosen as core materials while tetraethyl orthosilicate (TEOS) as the precursor solution to form silicon dioxide (SiO2) shell. The pH of precursor solution was kept at 2.5 for all composition of microencapsulated LA. The synthesized microencapsulated LA/SiO2 has been characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), X-Ray photoelectron spectroscopy (XPS), Scanning electron microscopy (SEM), and Transmission electron microscopy (TEM). The SEM and TEM confirm the microencapsulation of LA with SiO2. Thermogravimetric analysis (TGA) revealed better thermal stability of microencapsulated LA/SiO2 compared to pure LA. PCM with 50% LA i.e. LAPC-6 exhibited the highest encapsulation efficiency (96.50%) and encapsulation ratio (96.15%) through Differential scanning calorimetry (DSC) as well as good thermal reliability even after 30th cycle of heating and cooling process.

Preparation and Study of Polyethylene Glycol (PEG)/Titanium Dioxide (TiO2) Phase Change Materials

2011 ◽  
Vol 284-286 ◽  
pp. 214-218 ◽  
Author(s):  
Hai Yang Kang ◽  
Gui Juan Li
Keyword(s):  
Phase Change ◽  
Phase Change Materials ◽  
Sol Gel ◽  
Scanning Calorimetry ◽  
Dsc Measurements ◽  
Good Potential ◽  
Ft Ir ◽  
Change Temperature ◽  
Thermal Energy Storage Material ◽  
General Method

This paper adopted the general method of sol-gel to prepare a list of PEG/TiO2 phase change materials (PCMs). The chemical structure of the materials was investigated by FT-IR respectively. The infrared indicate that the materials have good chemical compatibility. The thermal properties of the samples were measured by differential scanning calorimetry(DSC) and thermogravimetry(TG). The surface topography and crystallized behavior of the materials were detected by SEM and XRD. The TG thermographs show the samples can sustain high temperature about 212°C. The DSC measurements display that the phase change temperature of the materials’ range from 52°C to 56°C. The results obtained from experiments show that the phase change materials possesses a good potential as a thermal energy storage material.

scholarly journals Preparation and thermal properties of crosslinked polyurethane/lauric acid composites as novel form stable phase change materials with a low degree of supercooling

RSC Advances ◽  
2017 ◽  
Vol 7 (47) ◽  
pp. 29554-29562 ◽  
Author(s):  
Weibo Kong ◽  
Xiaowei Fu ◽  
Ye Yuan ◽  
Zhimeng Liu ◽  
Jingxin Lei
Keyword(s):  
Thermal Properties ◽  
Phase Change ◽  
Lauric Acid ◽  
Phase Change Materials ◽  
Solvent Free ◽  
Stable Phase ◽  
Low Degree

In this article, a series of crosslinked polyurethane/lauric acid composites was prepared as form stable phase change materials (FSPCMs) through a brief and solvent-free method.

Synthetic Comb-Like Phase-Change Material Poly(Acrylonitrile-co-Lauric Acid) Copolymer for Low Temperature Energy Management

2018 ◽  
Vol 913 ◽  
pp. 722-728 ◽  
Author(s):  
Wei Chen ◽  
Heng Xue Xiang ◽  
Yun Meng Jiang ◽  
Wei Xia ◽  
Mei Fang Zhu
Keyword(s):  
Energy Storage ◽  
Low Temperature ◽  
Phase Change ◽  
Lauric Acid ◽  
Phase Change Materials ◽  
Resonance Spectroscopy ◽  
Thermal Reliability ◽  
Scanning Calorimetry ◽  
Storage Performance ◽  
Poly Acrylonitrile

Comb-like poly(acrylonitrile-co-lauric acid) (PANLA) phase change materials with low phase change temperature were synthesized via mixed solvent precipitation polymerization where acrylonitrile (AN) and dodecyl acrylate (DA) were employed as monomers. Fourier transform infrared spectroscopy (FTIR) and 13C nuclear magnetic resonance spectroscopy (13C NMR) were used to characterize the chemical structure of the resultant PANLA. Differential scanning calorimetry (DSC) and thermogravimetry analyzer (TG) were adapted to evaluate the energy storage performance and thermal reliability of PANLA materials. Thermal analysis revealed that comb-like PANLA had a good energy storage performance and cyclic stability. The crystallization temperature of PANLA was around -8 °C with a crystallization enthalpy range of 3.77~41.30 J/g which was intended to apply in an environment with a relatively low temperature.

scholarly journals Form-Stable Phase Change Materials Based on SEBS and Paraffin: Influence of Molecular Parameters of Styrene-b-(Ethylene-co-Butylene)-b-Styrene on Shape Stability and Retention Behavior

Materials ◽  
2020 ◽  
Vol 13 (15) ◽  
pp. 3285
Author(s):  
Ralf Rickert ◽  
Roland Klein ◽  
Frank Schönberger
Keyword(s):  
Mechanical Properties ◽  
Molecular Weight ◽  
Phase Change ◽  
Phase Change Materials ◽  
Matrix Material ◽  
Stable Phase ◽  
Scanning Calorimetry ◽  
Molecular Parameters ◽  
Styrene Content ◽  
Change Material

In this work, the influence of molecular parameters of styrene-b-(ethylene-co-butylene)-b-styrene (SEBS) triblock copolymer as matrix material in form-stable phase change material (FSPCM) on the thermo-mechanical properties and leakage behavior are studied. Various SEBS grades differing in their molecular weight, styrene content, and ethylene/butylene ratio are used as supporting matrix in composites with 90 wt.% paraffin. Thermo-mechanical properties are determined by rheological measurements. The results show phase transitions temperatures from solid to hard gel, hard gel to soft gel, and soft gel to gel fluid. Paraffin leakage in FSPCM is analyzed by mass loss over time in an oven at 60 °C. Differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) are applied to determine the thermal energy storage capacity. Finally, the molecular weight and the styrene content are combined to the molecular weight of styrene block which is identified as the authoritative parameter for the thermo-mechanical properties of the SEBS/PCM composite.

Polyamide as a Matrix for the Creation of Form-Stable Phase Change Materials

2009 ◽  
Vol 610-613 ◽  
pp. 414-418 ◽  
Author(s):  
Jing Guo ◽  
Nan Li
Keyword(s):  
Block Copolymer ◽  
Phase Change ◽  
Phase Change Materials ◽  
Polyamide 6 ◽  
Stable Phase ◽  
X Ray Diffraction ◽  
Thermal Reliability ◽  
Scanning Calorimetry ◽  
X Ray

Phase change materials (PCMs) with storing and releasing energy properties have been widely used in lots of fields such as solar energy storing, smart housing, thermo-regulated fibers, and agricultural greenhouse. Here, PCMs based on polyamide 6 (PA6) blended with Polyethylene glycol (PEG) was studied. In order to improve the compatibility between PA6 and PEG, a PA6-PEG block copolymer was synthesized and added to the blends. The structure and properties of the block copolymer were determined by Fourier Transform Infrared (FTIR), differential scanning calorimetry (DSC), X-ray diffraction (XRD) and optics microscope (OM). The results of DSC analysis showed that tThe copolymer block is phase separated. DSC results also showed that the phase transition temperature of the blend is different from that of pure PEG, indicating the interaction occurrence between PEG and PA6 by using PA6-PEG block copolymer, the latent heat of PEG/PA6 blend increased with the mass percent of PEG. The results of tThermal cycling tests showed that the blend as a PCM has good long-term thermal reliability.

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