Microencapsulated Phase Change Materials and its Application in Thermal-Regulated Fibers

2012 ◽  
Vol 519 ◽  
pp. 6-9 ◽  
Author(s):  
Wei Li ◽  
Xing Xiang Zhang ◽  
Xue Chen Wang
Keyword(s):  
Phase Change ◽  
Phase Change Materials ◽  
Formaldehyde Resin ◽  
Dsc Analysis ◽  
Melamine Formaldehyde ◽  
Scanning Calorimetry ◽  
The Core ◽  
Microencapsulated Phase Change Materials ◽  
Spinning Process ◽  
Alginate Fiber

The phase change materials (PCMs) can absorb, store or release large latent heat over a defined temperature range while the materials change phase or state, so they can be potentially used in thermal energy storage. In this paper, a series of microencapsulated phase change materials (MicroPCMs) with n-octadecane and n-dodecanol as core were successfully fabricated respectively, where the styrene-based copolymer, acrylic based copolymer, melamine-formaldehyde resin and polyurea were selected as shell materials. The morphology of these MicroPCMs was observed by scanning electron microscopy (SEM), and the core-shell structure and the shell thickness of microcapsules were also characterized by SEM. In addition, the phase change properties of MicroPCMs were investigated using differential scanning calorimetry (DSC) analysis. Furthermore, thermal-regulated calcium alginate fiber was produced by adding MicroPCMs in wet-spinning process; and the effects of various types of MicroPCMs on fiber was discussed.

Fabrication of Thermochromatic Microencapsulated Phase Change Materials

2011 ◽  
Vol 332-334 ◽  
pp. 1856-1859
Author(s):  
Xiao Hua Liao ◽  
Hai Feng Shi ◽  
Nan Song ◽  
Xing Xiang Zhang
Keyword(s):  
Molecular Structure ◽  
Differential Scanning Calorimetry ◽  
Chemical Structure ◽  
Phase Change Materials ◽  
In Situ Polymerization ◽  
Melamine Formaldehyde ◽  
Scanning Calorimetry ◽  
Microencapsulated Phase Change Materials ◽  
Structure Properties

Microencapsulated n-octadecane (MicroC18) and doped with thermochromatic powders (TC-MicroC18) were prepared with melamine-formaldehyde (M-F) resin as the wall via in-situ polymerization. The chemical structure and thermal behavior of microcapsules were investigated using fourier transform infrared spectroscopy (FTIR), and differential scanning calorimetry (DSC). Experimental results show that 63 wt% n-C18 has been incorporated into microcapsules, and the obvious thermochromatic effect of TC-MicroC18 is displayed with temperature changing. The structure-properties of TC-MicroC18 also is discussed in detail from the aspect of molecular structure.

Preparation of High Security N-Octadecane MicroPCMs by In Situ Polymerization

2015 ◽  
Vol 727-728 ◽  
pp. 141-144
Author(s):  
Xiao Qiu Song ◽  
Yu Ping Duan ◽  
Yue Xia Li
Keyword(s):  
Phase Change ◽  
Phase Change Materials ◽  
Urea Formaldehyde ◽  
Functional Materials ◽  
Formaldehyde Resin ◽  
Melamine Formaldehyde ◽  
Formaldehyde Content ◽  
Synthesis Conditions ◽  
Polymerization Method

N-octadecane microcapsules phase change materials(MicroPCMs) were prepared by thein-situ polymerization method using n-octadecane as core materials, urea-formaldehyde resin as shellmaterials respectively. Melamine–formaldehyde (MF) microcapsules have been widely applied inmany functional materials. Free formaldehyde content are important safetyfactor determining the survival of the microcapsules during fabrication andapplication. In this study, the formaldehyde content of n-octadecane MicroPCMs decrease to 0.35g/Kg which even lower than the standard EuropeanE3 level (0.6g/Kg) through regulation the synthesis conditions such as urea/formaldehyderatio of weight from 1:2 to 1:1.6, urea batch feeding three times ,curing endpH value to 1.0-1.5,reactive time extend to 4h,addition melamine and PVA.

scholarly journals Fabrication and characterization of conductive microcapsule containing phase change material

e-Polymers ◽  
2019 ◽  
Vol 19 (1) ◽  
pp. 519-526
Author(s):  
Hao-Ran Yun ◽  
Chun-Lei Li ◽  
Xing-Xiang Zhang
Keyword(s):  
Phase Change ◽  
Phase Change Materials ◽  
Thermo Gravimetric Analysis ◽  
Gravimetric Analysis ◽  
Scanning Calorimetry ◽  
Fourier Transformed Infrared Spectroscopy ◽  
Microencapsulated Phase Change Materials ◽  
Structure Morphology ◽  
Latent Heats

AbstractMicroencapsulated phase change materials (MicroPCMs) were fabricated using n-octadecane as PCM and melamine-formaldehyde as shell via in situ polymerization. They were coated with polypyrrole (PPy) to fabricate conductive microcapsules. The structure, morphology, thermal properties and the electrical conductivity of the microcapsules were characterized using the scanning electron microscope (SEM), the Fourier transformed infrared spectroscopy (FTIR), the thermo gravimetric analysis (TGA), the differential scanning calorimetry (DSC) and the standard four-probe method. The results show that, n-octadecane is well encapsulated in rough and compact spherical composites. The melting and freezing the composites latent heats are 90.2 and 92.0 J/g, respectively, while the mass percentage of the n-octadecane in the composites is 49.7%. The melting and crystallizing peak temperature of PPy/MicroPCMs is 24.6°C and 17.9°C, respectively. The addition of PPy improves the thermal stability of the composites. The conductivity of the PPy/MicroP-CMs increases from 0.1 S‧cm–1 to 0.33 S‧cm–1 as the PPy concentration increases from 3 to 10 wt%.

Thermo-regulating properties of textiles with incorporated microencapsulated Phase Change Materials

MRS Advances ◽  
2020 ◽  
Vol 5 (18-19) ◽  
pp. 1023-1028
Author(s):  
Maria Cristina Larciprete ◽  
Stefano Paoloni ◽  
Gianmario Cesarini ◽  
Concita Sibilia ◽  
Vitalija Rubežienė ◽  
...  
Keyword(s):  
Phase Change ◽  
Phase Change Materials ◽  
Heat Energy ◽  
Infrared Emissivity ◽  
Scanning Calorimetry ◽  
Radiation Emission ◽  
Dynamic Tuning ◽  
Microencapsulated Phase Change Materials ◽  
Cotton Yarns ◽  
Fabric Surface

ABSTRACTPhase change materials (PCMs) are getting increasing interest due to their capacity to absorb, store and release heat energy. Their effectiveness is characterized by quantities of absorbed/released heat energy, expressed as enthalpy. Specifically, the larger is the enthalpy, the more efficient thermoregulation effect is achieved. With this in mind, PCMs can be used in the manufacture of thermally regulated clothing in order to minimize heat strain and simultaneously improve thermal comfort. Moreover, such materials also modify their infrared radiation emission during phase transition, thus they can be envisioned to exploit thermal shielding applications. The aim of the present research was to investigate the infrared emissivity of textiles composed by cotton yarns with dispersed PCMs. The organic microcapsules of phase change materials, having different binding to the fibre mechanisms, were padded onto the fabric surface by pad-dry-cure method. The thermal properties and stabilities were measured using differential scanning calorimetry, while infrared emissivity was characterized using infrared thermographic technique. The obtained experimental results show a dynamic tuning of IR emissivity during heating/cooling process which can be correlated to the type and properties (enthalpy of fusion) of the corresponding PCM.

scholarly journals A SUSTAINABILITY APPROACH: INTEGRATION OF A MICROENCAPSULATED PHASE CHANGE MATERIAL TO A RECYCLED PES NONWOVEN FABRIC TO DEVELOP A HEAT STORING RECYCLED MATERIAL

2021 ◽  
Vol 2021 ◽  
pp. 58-64
Author(s):  
E.G. Saraç ◽  
E. Öner ◽  
M.V. Kahraman
Keyword(s):  
Phase Change ◽  
Phase Change Material ◽  
Phase Change Materials ◽  
In Situ Polymerization ◽  
Coconut Oil ◽  
Nonwoven Fabric ◽  
Scanning Calorimetry ◽  
The Core ◽  
Needle Punching ◽  
Change Material

Phase change materials (PCMs) are thermal energy storing materials which are adopted in various industries including textiles. They provide temperature regulation by absorbing the heat from the ambiance or releasing the latent heat that they store. PCMs are widely integrated into textiles in microencapsulated form where the core PCM is covered by the microcapsule shell and protected during phase change. This form also provides a higher thermal conductivity. In this work, a blend of organic coconut oil and n-octadecane were used as phase change material in core, and melamine formaldehyde was used as shell material to develop microencapsulated PCM for heat storage. The microcapsules were produced by using in situ polymerization method. The developed microcapsules (MPCMs) were integrated to a recycled PES (polyester) nonwoven fabric, generated from PET (polyethylene terephthalate) fibres, and manufactured by combing and needle punching technique. The MPCMs were implemented to the fabric by coating method. The core PCM, MPCM, and the coated nonwoven fabric were assessed by Differential Scanning Calorimetry (DSC), Scanning Electron Microscopy (SEM) and Fourier Transform Infrared Spectroscopy (FT-IR). SEM results indicated that spherical and uniform microcapsules were obtained with a particle size of 3-9 μm. DSC results revealed that MPCM and the MPCM coated nonwoven fabric possessed a remarkable melting enthalpy of 111 J/g and 30.9 J/g, respectively at peak melting temperatures of 28.1°C and 27.4°C.

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