Preparation and characterization of cross-linked polyurethane shell microencapsulated phase change materials by interfacial polymerization

Lu, Shaofeng; Shen, Tianwei; Jian-wei, Xing; Song, Qingwen; Shao, Jianzhong; Zhang, Jing; Xin, Cheng

doi:10.1016/j.matlet.2017.09.074

Cited by 107 publications

(36 citation statements)

References 12 publications

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“…As shown in Figure (a), these microcapsules with micron diameters are spherical. Compared to MicroPCMs generated by the stirring method, MicroPCMs fabricated by the microfluidic method present an excellent homogeneity. After washing twice by distilled water, the MicroPCMs are freeze‐dried for the following electron microscopy scanning.…”

Section: Resultsmentioning

confidence: 99%

“…In the previous research, the preparation of microcapsules containing PCMs requires stirring and heating at the same time. The temperature is high, the time is long and the particle size distribution is wide . Polenz et al designed a microfluidic device to prepare polyurea microcapsules and discussed the effects of the surfactant on the shell morphology, the mechanical and permeation properties of microcapsules.…”

Section: Introductionmentioning

confidence: 99%

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Preparation of Polyurea Microcapsules Containing Phase Change Materials Using Microfluidics

Shi

Wang

2020

ChemistrySelect

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The polyurea microcapsules containing phase change materials (MicroPCMs) are prepared by using a simple microfluidic device at low temperature. Paraffin is the core material, and isophorone diisocyanate (IPDI) and tetraethylenepentamine (TEPA) are the shell materials. Effects of the flow rate of each phase, the emulsifier type, and the emulsifier dosage on MicroPCMs are investigated systematically. The size of MicroPCMs can be controlled by changing the flow rate of each phase. Fourier transform infrared spectroscopy (FT-IR) and scanning electron microscope (SEM) are used to characterize the chemical structure and morphology of the MicroPCMs, respectively. The images of SEM show that MicroPCMs have the regular spherical shape and a good size distribution. The results of FTIR indicate that MicroPCMs have been successfully prepared as the characteristic peaks of paraffin and polyurea are observed in the curve of MicroPCMs. The thermal properties and stabilities of MicroPCMs are investigated through differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). When taking sodium dodecyl sulfate (SDS) as the emulsifier, the results show that the latent heat is 87.5 J/g with an encapsulation efficiency of 96.5% and the appropriate dosage of SDS is 1.0 g for synthesizing MicroPCMs. The results of TGA present that the polyurea shell can prevent the leakage and volatilization of the paraffin.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Preparation of Polyurea Microcapsules Containing Phase Change Materials Using Microfluidics

Shi

Wang

2020

ChemistrySelect

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“…e TGA results showed that the obtained microcapsules decomposed in three steps above 190°C, implying the microcapsules possessed good thermal stability. Lu et al used polyurethane to form a cross-linked network shell to encapsulate the butyl stearate core via interfacial polymerization [105]. Siddhan et al microencapsulated n-octadecane using toluene-2,4-diisocyanate (TDI) as a oil-soluble monomer and diethylene triamine (DETA) as a water-soluble monomer through interfacial polymerization [106].…”

Section: Chemical Methodsmentioning

confidence: 99%

Phase Change Material (PCM) Microcapsules for Thermal Energy Storage

Peng

Dou

et al. 2020

Advances in Polymer Technology

196

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Phase change materials (PCMs) are gaining increasing attention and becoming popular in the thermal energy storage field. Microcapsules enhance thermal and mechanical performance of PCMs used in thermal energy storage by increasing the heat transfer area and preventing the leakage of melting materials. Nowadays, a large number of studies about PCM microcapsules have been published to elaborate their benefits in energy systems. In this paper, a comprehensive review has been carried out on PCM microcapsules for thermal energy storage. Five aspects have been discussed in this review: classification of PCMs, encapsulation shell materials, microencapsulation techniques, PCM microcapsules’ characterizations, and thermal applications. This review aims to help the researchers from various fields better understand PCM microcapsules and provide critical guidance for utilizing this technology for future thermal energy storage.

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“…In the past, interfacial polymerisation has been used to microencapsulate PCMs with PU shell, due to its formaldehyde-free properties, and it is usually formed by reacting aromatic diisocyanate and aliphatic primary diamines. Unfortunately, this reaction is stated to exhibit serious problems, including production of linear structures, and fast rate of reaction which leads to the generation of microcapsules with poor thermal stability, and compactness [93,94]. Table 3 shows summarises the properties of microcapsules fabricated by this method.…”

Section: Interfacial Polymerisation/polycondensationmentioning

confidence: 99%

Phase change materials for building construction: An overview of nano-/micro-encapsulation

Sivanathan

Dou

Wang

et al. 2020

Nanotechnology Reviews

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Buildings contribute to 40% of total global energy consumption, which is responsible to 38% of greenhouse gas emissions. It is critical to enhance the energy efficiency of buildings to mitigate global warming. In the last decade, advances in thermal energy storage (TES) techniques using phase change material (PCM) have gained much attention among researchers, mainly to reduce energy consumption and to promote the use of renewable energy sources such as solar energy. PCM technology is one of the most promising technologies available for the development of high performance and energy-efficient buildings and, therefore, considered as one of the most effective and on-going fields of research. The main limitation of PCM is its leakage problem which limits its potential use in building construction and other applications such as TES and textiles, which can be overcome by employing nano-/micro-encapsulation technologies. This paper comprehensively overviews the nano-/micro-encapsulation technologies, which are mainly classified into three categories including physical, physiochemical and chemical methods, and the properties of microcapsules prepared. Among all encapsulation technologies available, the chemical method is commonly used since it offers the best technological approach in terms of encapsulation efficiency and better structural integrity of core material. There is a need to develop a method for the synthesis of nano-encapsulated PCMs to achieve enhanced structural stability and better fracture resistance and, thus, longer service life. The accumulated database of properties/performance of PCMs and synthesised nano-/micro-capsules from various techniques presented in the paper should serve as the most useful information for the production of nano-/micro-capsules with desirable characteristics for building construction application and further innovation of PCM technology.

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Preparation and characterization of cross-linked polyurethane shell microencapsulated phase change materials by interfacial polymerization

Cited by 107 publications

References 12 publications

Preparation of Polyurea Microcapsules Containing Phase Change Materials Using Microfluidics

Preparation of Polyurea Microcapsules Containing Phase Change Materials Using Microfluidics

Phase Change Material (PCM) Microcapsules for Thermal Energy Storage

Phase change materials for building construction: An overview of nano-/micro-encapsulation

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