Fabrication and Performances of Microencapsulated <i>n</i>-Alkanes with Copolymers Having <i>n</i>-Octadecyl Side Chains As Shells

Tang, Xiaopeng; Li, Wei; Shi, Haifeng

doi:10.1021/ie403542h

Cited by 18 publications

(7 citation statements)

References 52 publications

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“…We find that both the endothermic and exothermic peaks become sharp as the heating–cooling rate decreases; moreover, a slower heating–cooling rate leads to a narrower under-cooling temperature range (the temperature between the endothermic and exothermic peaks). Another observation was that, as the capsule size reduced to about 50 and 20 µm (DSC curves of 20 µm n -hexadecane-encapsulated capsules are shown in Figure S2 ), an additional exothermic peak appeared ( Figure 6 b,c), which was perhaps attributed to homogeneous nucleation [ 27 ]. This may indicate enhanced super-cooling compared to the large capsules (~150 µm) shown in Figure 6 a and the bulk n -eicosane without encapsulation ( Figure 6 d).…”

Section: Resultsmentioning

confidence: 99%

Synthesis of Uniform Alkane-Filled Capsules with a High Under-Cooling Performance and Their Real-Time Optical Properties

Liu

Zhang

et al. 2019

Polymers

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Encapsulating under-cooling materials has been a promising strategy to address the compatibility issue with a surrounding matrix. Herein, we present the synthesis of a uniform alkane-infilled capsule system that shows obvious under-cooling properties. As demonstrating examples, n-hexadecane was selected as a liquid alkane and n-eicosane as a solid in our systems as core materials via in-situ polymerization, respectively. The under-cooling properties of capsules were investigated using differential scanning calorimetry, real-time optical observations with two polarizers, and molecular modeling. The n-hexadecane encapsulated capsules exhibited a large under-cooling temperature range of 20 °C between melt and crystallization, indicating potential applications for structure-transformation energy storage. In addition, molecular modeling calculations confirmed that the solid forms of n-hexadecane and n-eicosane are more stable than their liquid forms. From liquid to solid form, the n-hexadecane and n-eicosane release energies were 4.63 × 103 and 4.95 × 103 J·g−1, respectively.

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Section: Resultsmentioning

confidence: 99%

Synthesis of Uniform Alkane-Filled Capsules with a High Under-Cooling Performance and Their Real-Time Optical Properties

Liu

Zhang

et al. 2019

Polymers

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“…Peak a is assigned to the heterogeneous nucleation crystallization, and peak b is assigned to the unstable rotator phase. 30 Compared with sample b-d, the increase of the unstable rotator phase b with the increase of fiber diameter may be attributed to the reduction of the numbers of nuclei for heterogeneous nucleation in each fiber. The nuclear concentration is decreased.…”

Section: Thermal Properties Of the Fibersmentioning

confidence: 88%

Electrospinning of thermo-regulated sheath/core submicrometer fiber with galactitol hexa palmitate as a core

Cao

Pei

et al. 2017

Textile Research Journal

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Galactitol hexa palmitate (GHP) as a phase change material (PCM) was fabricated via an esterification reaction of galactitol with palmitoyl chloride. A series of sheath/core composite submicrometer fibers were coaxially electro-spun using poly(acrylonitrile-co-vinylidene chloride) (P(AN-co-VDC)) as a sheath and the GHP as a core. The phase change properties, thermal stability, and the surface morphology of the fibers were characterized using field emission scanning electronic microscopy (FE-SEM), transmission electronic microscopy (TEM), differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA), etc. The results show that coaxial submicrometer fibers with a smooth surface and average diameter of 796 nm were electro-spun. The optimum feed rate of the sheath and core components for fabricating thermo-regulated submicrometer fibers with high enthalpies are 1.25 and 0.125 mL/h, respectively. The fiber can absorb 55 J/g of heat energy at approximately 23.2℃ and release 54 J/g at approximately 20.3℃. By contrast, the enthalpy of the P(AN-co-VDC)/GHP submicrometer fiber is higher than the previously published results.

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“…Phase change materials (PCMs) are the most widely used thermal energy storage materials. During the phase change process, PCMs absorb/release heat to remain in an isothermal state for a period of time [4,5]. They contribute to the efficient use of waste heat, solar energy, building applications, etc.…”

Section: Introductionmentioning

confidence: 99%

Poly(mono/diethylene glycol n-tetradecyl ether vinyl ether)s with Various Molecular Weights as Phase Change Materials

2018

Self Cite

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At present, research on the relationship of comb-like polymer phase change material structures and their heat storage performance is scarce. Therefore, this relationship from both micro and macro perspectives will be studied in this paper. In order to achieve a high phase change enthalpy, ethylene glycol segments were introduced between the vinyl and the alkyl side chains. A series of poly(mono/diethylene glycol n-tetradecyl ether vinyl ethers) (PC 14 E n VEs) (n = 1, 2) with various molecular weights were polymerized by living cationic polymerization. The results of PC 14 E 1 VE and PC 14 E 2 VE showed that the minimum number of carbon atoms required for side-chain crystallization were 7.7 and 7.2, which were lower than that reported in the literature. The phase change enthalpy 89 J/g (for poly(mono ethylene glycol n-tetradecyl ether vinyl ethers)) and 86 J/g (for poly(hexadecyl acrylate)) were approximately equal. With the increase of molecular weight, the melting temperature, the melting enthalpy, and the initial thermal decomposition temperature of PC 14 E 1 VE changed from 27.0 to 28.0 • C, from 95 to 89 J/g, and from 264 to 287 • C, respectively. When the number average molar mass of PC 14 E n VEs exceeded 20,000, the enthalpy values remained basically unchanged. The introduction of the ethylene glycol chain was conducive to the crystallization of alkyl side chains.

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Fabrication and Performances of Microencapsulated n-Alkanes with Copolymers Having n-Octadecyl Side Chains As Shells

Cited by 18 publications

References 52 publications

Synthesis of Uniform Alkane-Filled Capsules with a High Under-Cooling Performance and Their Real-Time Optical Properties

Synthesis of Uniform Alkane-Filled Capsules with a High Under-Cooling Performance and Their Real-Time Optical Properties

Electrospinning of thermo-regulated sheath/core submicrometer fiber with galactitol hexa palmitate as a core

Poly(mono/diethylene glycol n-tetradecyl ether vinyl ether)s with Various Molecular Weights as Phase Change Materials

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