Polyrotaxane based leakage-proof and injectable phase change materials with high melting enthalpy and adjustable transition temperature

Yin, Guang‐Zhong; López, Alba Marta; Yang, Xiaomei; Ao, Xiang; Hobson, Jose; Wang, De‐Yi

doi:10.1016/j.cej.2022.136421

Cited by 16 publications

(6 citation statements)

References 43 publications

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“…[163][164] Notably, thermal phase change materials as one of the thermoresponsive materials are now gaining more attention, requiring high form stability, high enthalpy efficiency, and outstanding thermal cycle performance. [165][166][167][168] Besides the superior mechanical properties, the advantage of slide-ring structures for the thermal phase change material is reflected in the significant increase in form stability with the cyclodextrin addition. The crystallinity of polyethylene glycol chains with cyclodextrins and the high conformational freedom of slide-ring structures achieve high phase transition enthalpy and excellent cycling performance, which will provide a convenient way for the intelligent heat treatment packaging.…”

Section: Stimuli-responsive Smart Devicesmentioning

confidence: 99%

Polyrotaxane‐Based Functional Materials Enabled by Molecular Mobility and Conformational Transition^†

Cui

Zhang

2023

Chin. J. Chem.

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Comprehensive SummarySlide‐ring structured polyrotaxanes with high molecular mobility and reversible conformational transition ability can achieve high performance and multifunctionality of the material in various applications. There have been many reviews describing advances in the research of rotaxanes and polyrotaxanes. However, most of them typically focus on the precise synthesis of mechanically interlocked molecules and the control of microscopic molecular shuttles. In this review, we examine the effects of motion activity and conformational transition due to molecular slide on the performance of polyrotaxanes and the latest functional applications. Different designs of polyrotaxane‐based functional materials are presented to improve the potential for applications including self‐healing stretchable elastomers/gels, stimuli‐responsive smart devices, battery electrode binders, and biomedical drug delivery. It is anticipated that this review will provide insights and guidance for future developments in the design, synthesis and application of polyrotaxane‐based functional materials.

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Section: Stimuli-responsive Smart Devicesmentioning

confidence: 99%

Polyrotaxane‐Based Functional Materials Enabled by Molecular Mobility and Conformational Transition^†

Cui

Zhang

2023

Chin. J. Chem.

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“…In recent years, introducing phase change materials (PCMs) into a STEGS has opened huge opportunities for efficient, durable, and stable electricity output. PCMs can store a great amount of latent heat captured and converted from solar energy at an almost constant temperature, , thus offering the possibility of all-weather multiple-energy harvest for the STEGS . Compared to directly applying solar irradiation onto a STEGS, the combination of solar thermoelectric generators with organic PCMs can gain more advantages to realize solar-driven thermoelectric conversion and stable electricity output in spite of the instability of solar energy and time/space discrepancy .…”

Section: Introductionmentioning

confidence: 99%

Unidirectionally Structured Magnetic Phase-Change Composite Based on Carbonized Polyimide/Kevlar Nanofiber Complex Aerogel for Boosting Solar-Thermo-Electric Energy Conversion

Shi,

Liu,

Wang

2024

ACS Appl. Mater. Interfaces

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To realize highly efficient solar-thermo-electric energy conversion for clean electricity power generation, we have developed a new type of unidirectionally structured magnetic phase-change composite comprising a carbonized polyimide (C−PI)/Kevlar nanofiber (KNF) complex aerogel as a 3D carbon skeleton porous supporting material, CoFe 2 O 4 nanoparticles as a magnetic additive, polyethylene glycol (PEG) as a phase-change material, and polypyrrole as a photothermal absorption coating layer. The as-fabricated C−PI/KNF complex aerogel exhibits a unidirectional microstructure, high porosity, robust skeleton frame, ultralight weight, and high thermal conductance. Featured with such unique structure and characteristics, the complex aerogel can offer an effective heat and electron transfer method to ensure highly efficient solarthermal conversion and photothermal energy storage of the developed composite. The developed composite exhibits a high latent heat capacity of over 150 J g −1 , outstanding shape stability along with a low leakage of 0.2 wt %, good thermal cycling stability, and high photothermal conversion efficiency of 84.8%. Based on the Seebeck effect, a solar thermoelectric generation system (STEGS) was constructed with the hot side coupled with the developed composite and the cold side immersed in air and ice water. Under 2.0 kW m −2 solar irradiation, the developed STEGS in ice water obtained maximum output voltage and current of 259.7 mV and 27.1 mA, respectively, which are significantly higher than those in air. The output power of the developed STEGS in an ice water environment is 50.6% higher than that in air under 4.0 kW m −2 solar irradiation. More importantly, the developed STEGS in ice water continuously generated output voltage and current for about 810 s without solar irradiation thanks to the latent heat release by the PEG component within the developed composite. In addition, the introduction of magnetic CoFe 2 O 4 can accelerate solar-thermal conversion through periodic electron motion by the Neél relaxation or Brownian relaxation. This resulted in an increase in the maximum output voltage and current by 13.7 and 11.5%, respectively, under an alternating magnetic field as a result of the magnetism-accelerated solar-thermo-electric conversion. This study offers an innovative approach for developing PCM-based advanced functional materials for solar energy utilization in clean and sustainable electricity generation.

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“…Also, the current methods commonly used to solve the PCM leakage issue include encapsulation, porous media, and macromolecular support. For example, Yin et al , realized supramolecular PLR (polyrotaxane) was realized as a support material to encapsulate PEG with different molecular weights and different contents to prepare high-performance PCM. Among them, the α-CD (α-Cyclodextrin) crystal unit maintains its morphology during PEG melting and acts as a physical cross-linking point, and the structural similarity between PLR and PEG ensures the compatibility between PLR and PEG, which prevents the leakage of PEG during the phase change process.…”

Section: Introductionmentioning

confidence: 99%

A Novel Room-Temperature Flexible Phase Change Material for Solar Energy Photothermal Conversion and Battery Thermal Management

Huang,

Zou,

Chen

et al. 2024

ACS Sustainable Chem. Eng.

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In recognition of their excellent capacity for regulating thermal energy storage and release, phase change materials (PCMs) have been rediscovered and received growing significance in advanced solar energy storage and battery thermal management (BTM). Nevertheless, their insufficient thermal conductivity, poor shape stabilization, and high rigidity hinder their application in BTM systems. Herein, we reported a novel stable ordinary temperature flexible phase change material (FPCM) basis of paraffin wax (PW), polyolefin elastomer (POE), and expanded graphite (EG), which efficiently solves the aforementioned problem. And then, through flexibility, the FPCM was smartly mounted on the power batteries by overfilling, making the components compact and efficient. Thermal contact resistance (TCR) while operating the battery pack could be decreased by the flexible wrapping of the FPCM. Results show that the above BTM assembly effectively reduced the TCR to 0.28 °C/W. This FPCM-based reactive cooling BTM ensures that the temperature of the battery pack is kept under a safe temperature (55 °C) at all times. With the effect of EG, the prepared FPCM exhibits a substantial improvement in thermal conductivity, achieving 1.929 W/mK, as well as a prominent photothermal efficiency of conversion (91.2%). Notably, its ultraflexibility, high thermal conductivity, and excellent latent heat provide a convenient way for the thermal management packaging of complex and multimodel electronic devices.

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Polyrotaxane based leakage-proof and injectable phase change materials with high melting enthalpy and adjustable transition temperature

Cited by 16 publications

References 43 publications

Polyrotaxane‐Based Functional Materials Enabled by Molecular Mobility and Conformational Transition^†

Polyrotaxane‐Based Functional Materials Enabled by Molecular Mobility and Conformational Transition^†

Unidirectionally Structured Magnetic Phase-Change Composite Based on Carbonized Polyimide/Kevlar Nanofiber Complex Aerogel for Boosting Solar-Thermo-Electric Energy Conversion

A Novel Room-Temperature Flexible Phase Change Material for Solar Energy Photothermal Conversion and Battery Thermal Management

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Polyrotaxane based leakage-proof and injectable phase change materials with high melting enthalpy and adjustable transition temperature

Cited by 16 publications

References 43 publications

Polyrotaxane‐Based Functional Materials Enabled by Molecular Mobility and Conformational Transition†

Polyrotaxane‐Based Functional Materials Enabled by Molecular Mobility and Conformational Transition†

Unidirectionally Structured Magnetic Phase-Change Composite Based on Carbonized Polyimide/Kevlar Nanofiber Complex Aerogel for Boosting Solar-Thermo-Electric Energy Conversion

A Novel Room-Temperature Flexible Phase Change Material for Solar Energy Photothermal Conversion and Battery Thermal Management

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Resources

About

Polyrotaxane‐Based Functional Materials Enabled by Molecular Mobility and Conformational Transition^†

Polyrotaxane‐Based Functional Materials Enabled by Molecular Mobility and Conformational Transition^†