Investigation of a hyperbranched polyurethane as a solid-state phase change material

Liao, Li; Cao, Qi; Liao, Hongjian

doi:10.1007/s10853-010-4211-3

Cited by 37 publications

(13 citation statements)

References 19 publications

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“…However, the rigid segments of the cross-linking structure partially constrained the mobility of PEG chains and therefore prevented crystal growth, resulting in the formation of smaller-sized crystals. 37,38 As evidently seen from Figure 5C…”

Section: Crystalline-amorphous Phase Transitions Of the S-spcmsmentioning

confidence: 73%

“…The amounts of spherulite phases were increased apparently due to PEG segments of the polymers. However, the rigid segments of the cross‐linking structure partially constrained the mobility of PEG chains and therefore prevented crystal growth, resulting in the formation of smaller‐sized crystals . As evidently seen from Figure C,F,I), the spherulite structures of the polymers were completely disappeared above their phase transition temperatures.…”

Section: Resultsmentioning

confidence: 96%

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Thermal energy storage properties of polyethylene glycol grafted styrenic copolymer as novel solid‐solid phase change materials

2020

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Summary Polymeric solid‐solid phase change materials (S‐SPCMs) are functional materials with phase transition‐heat storing/releasing ability. With this respect, a series of polyethylene glycol (PEG) grafted styrenic copolymer were produced as novel S‐SPCMs. PEGs with three different molecular weights were used for synthesis of isocyanate‐terminated polymers (ITPs). To achieve cross‐linking S‐SPCMs, the ITPs were grafted with styrene‐co‐ally alcohol) (PSAA) at three different PSAA:PEG mole ratios. The produced polymers were characterized using Fourier transform infrared (FT‐IR), proton nuclear magnetic resonance (1H NMR), and X‐ray diffraction (XRD) technique. The crystalline‐amorphous phase transitions of the polymers were examined using polarized optical microscopy (POM). The FT‐IR, NMR, and XRD results confirmed the expected chemical structures and crystallization performances of the polymers. Thermal energy storage (TES) properties of the S‐SPCMs were determined by differential scanning calorimetry (DSC). The DSC results revealed that the polymers with grafting ratio of PSAA:PEG(1:1) had phase transition enthalpies between about 74 and 142 J/g and phase transition temperatures between about 26°C and 57°C. Thermogravimetric analysis (TGA) measurements demonstrated that the S‐SPCMs were resistant to thermal decomposition until about 300°C. Thermal conductivities of the produced S‐SPCMs were measured in a range of about 0.18 to 0.19 W/mK. Furthermore, TES properties of the S‐SPCMs were slightly changed as their chemical structures were remained after 5000 thermal cycles. By overall evaluation of the findings, it can be foreseen that particularly PSAA‐g‐PEG(1:1) polymers can be considered as promising S‐SPCMs for some TES practices such as air conditioning of buildings, thermoregulation of food packages, automobile components, electronic devices, and solar photovoltaic panels.

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Section: Crystalline-amorphous Phase Transitions Of the S-spcmsmentioning

confidence: 73%

Section: Resultsmentioning

confidence: 96%

Thermal energy storage properties of polyethylene glycol grafted styrenic copolymer as novel solid‐solid phase change materials

2020

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“…[20][21][22] These properties are also crucial to the fabrication of PCMs. Cao and coworkers [23][24][25] prepared a hyperbranched polyurethane solid-solid PCM with PEG as the phase-change functional chain and 4,4-diphenylmethane diisocyanate and commercial hyperbranched polyester (Boltorn H30) as the hard segments via bulk polymerization. The phasechange enthalpy observed was more than 110 J/g.…”

Section: Introductionmentioning

confidence: 99%

Solid–solid phase‐change materials based on hyperbranched polyurethane for thermal energy storage

Wang

et al. 2017

J of Applied Polymer Sci

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A hyperbranched polyol (HBP) was synthesized with poly(ethylene glycol) (PEG) as the core molecule and 2,2‐bis(hydroxymethyl) propionic acid as the chain extender. Then, a series of hyperbranched polyurethane phase‐change materials (HP‐PCMs) with different crosslinking densities was synthesized with isophorone diisocyanate and HBP as a molecular skeleton and PEG 6000 as a phase‐change ingredient. 1H‐NMR, gel permeation chromatography, and Fourier transform infrared spectroscopy confirmed the successful synthesis of the HBP and HP‐PCMs. The polarization optical microscopy and wide‐angle X‐ray diffraction results show that the HP‐PCM exhibited good crystallization properties, but the crystallinity was lower than that of PEG 6000. The analysis results from differential scanning calorimetry indicated that the HP‐PCMs were typical solid–solid phase‐change materials with suitable phase‐transition temperatures. In addition, HP‐PCM‐3, with an appropriate degree of hyperbranched structure, possessed the highest thermal transition enthalpy of 123.5 J/g. Moreover, thermal cycling testing and thermogravimetric analysis showed that the HP‐PCMs exhibited good thermal reliability and stability. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 45014.

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“…Polyurethanes (PUs) are widely used in industrial applications because they have excellent properties, which can be improved by changing the chemical structure of the compositions, and the microphase‐separated morphologies. The PU morphology and properties can be enhanced by the introduction of new chemical structures in the backbone chains, which promote strong intermolecular association through physical crosslinks, or by chemical crosslinks that increase the structural integrity of the hard segment that results in improved properties 1–10…”

Section: Introductionmentioning

confidence: 99%

“…The PU morphology and properties can be enhanced by the introduction of new chemical structures in the backbone chains, which promote strong intermolecular association through physical crosslinks, or by chemical crosslinks that increase the structural integrity of the hard segment that results in improved properties. [1][2][3][4][5][6][7][8][9][10] Conventional PUs exhibit poor heat resistance that limits their applicability as engineering material. The thermal stability of PUs can be improved by changing the chemical structure of the backbone chains through the introduction of thermally stable heterocyclic groups.…”

Section: Introductionmentioning

confidence: 99%

Effect of pyridazine content and crosslinker structure on the properties of polyurethane elastomers

Oprea¹

2012

J of Applied Polymer Sci

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This article studies the development of a series of heterocyclic polyurethanes (PUs) with various pyridazine content and different crosslinker structure in their main chains. All of the isocyanate-terminated PU prepolymers were prepared from poly(tetramethylene oxide) glycol of molecular weight 1400 (Terathane 1400) and 1,6-hexamethylene diisocyanate. The properties of the obtained linear and crosslinked pyridazine-based PU were compared with the properties of common PUs obtained by chain extension with 1,4-butanediol. All the obtained PUs were characterized through spectral and thermal behavior. The pyridazine-based PU showed improved thermal stability with 10% weight loss at temperatures above 370-400 C. With the increase of pyridazine content the values of Young's modulus are higher and the strain at break decreases. Increasing pyridazine content leads to increased films surface hydrophilicity.

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Investigation of a hyperbranched polyurethane as a solid-state phase change material

Cited by 37 publications

References 19 publications

Thermal energy storage properties of polyethylene glycol grafted styrenic copolymer as novel solid‐solid phase change materials

Thermal energy storage properties of polyethylene glycol grafted styrenic copolymer as novel solid‐solid phase change materials

Solid–solid phase‐change materials based on hyperbranched polyurethane for thermal energy storage

Effect of pyridazine content and crosslinker structure on the properties of polyurethane elastomers

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