Fabrication and Properties of Microencapsulated-Paraffin/Gypsum-Matrix Building Materials for Thermal Energy Storage

2012 ◽  
Vol 427 ◽  
pp. 45-50 ◽  
Author(s):  
Jun Feng Su ◽  
Sheng Bao Wang
Keyword(s):  
Phase Change ◽  
Building Materials ◽  
Phase Change Materials ◽  
In Situ Polymerization ◽  
Core Material ◽  
Shell Material ◽  
Cycling Treatment ◽  
Energy Needs ◽  
Microencapsulated Phase Change Materials

Microencapsulated phase change materials (microPCMs) contain paraffin was fabricated by in-situ polymerization using methanol-modified melamine-formaldehyde (MMF) as shell material. The shell of microPCMs was sooth and compact with global shape, its thickness was not greatly affected by the core/shell ratio and emulsion stirring rate. More shell material in microPCMs could enhance the thermal stability and provide higher compact condition for core material. After a 100-times thermal cycling treatment, the microPCMs contain paraffin also nearly did not change the phase change behaviors of PCM. With the increasing of weight contents of microPCMs in gypsum board, the thermal conductivity (λ) values of composites had decreased. The simulation of temperature tests proved that the microPCMs/gypsum composite could store the time-dependent and intermittent solar energy, which did not necessarily meet the energy needs for space heating at all times.

Phase Change Materials of Microcapsules Containing Paraffin

2012 ◽  
Vol 482-484 ◽  
pp. 1596-1599
Author(s):  
Dian Wu Huang ◽  
Hong Mei Wang
Keyword(s):  
Particle Size ◽  
Thermal Properties ◽  
Phase Change ◽  
Phase Change Materials ◽  
In Situ Polymerization ◽  
Core Material ◽  
Study Phase ◽  
Shell Material ◽  
Core Content

In this study, phase change microcapsules were prepared by in situ polymerization using paraffin as core material, poly(MMA -co- MAA) as shell material, Tween60/span60 as emulsifier. The surface morphology, thermal properties and particle size distribution of the prepared microcapsules were investigated by using SEM, TGA, DSC and ELS. The effects of paraffin core content and amount of emulsifier on the properties of microcapsules were studied.

Preparation and Properties of Modified PolyGram Nano-Microencapsulated Phase Change Materials

2010 ◽  
Vol 160-162 ◽  
pp. 7-12
Author(s):  
Yi Da Tang ◽  
Wen Heng Zheng ◽  
Zhong Hua Tang ◽  
Ling Wang
Keyword(s):  
Phase Transition ◽  
Transition Temperature ◽  
Phase Change ◽  
Phase Transition Temperature ◽  
Phase Change Materials ◽  
Core Material ◽  
Shell Material ◽  
Microencapsulated Phase Change Materials ◽  
Nanometer Material ◽  
Bactericidal Efficiency

The nano-microencapsulated phase change materials were prepared ,with butyl stearate as core material, styrene-maleic anhydride copolymer (SMA) as dispersant and emulsifier, polyurea resin as shell material which was synthesized from monomer 2, 4- toluene diisocyanate (TDI) and diethylen etriamine (DETA),and was modified by glycerol, nanometer material(TiO2) as functional material. We have analyzed the compactness, stabilities, phase transition temperature, and bactericidal efficiency of microcapsules. The results show that the compactness properties and stabilities properties of the modified microcapsule, when the ratio of core material and shell material is 3:4, such as washing stability properties and thermal stability properties are obviously improved than that of non-modified, phase transition temperature rises from 23.2°C to 24.2°C,bactericidal efficiency of Nano-Micro-PCMs is 7~8 times more than that of separate using of nanometer material （TiO2）, modified polyurea Nano-Micro-PCMs may have extensive application prospects in the fields of architecture, textile and air-conditioning filtering materials.

Preparation and Characterization of Hexadecane Microcapsule Phase Change Materials by In Situ Polymerization

2013 ◽  
Vol 815 ◽  
pp. 367-370 ◽  
Author(s):  
Xiao Qiu Song ◽  
Yue Xia Li ◽  
Jing Wen Wang
Keyword(s):  
Particle Size ◽  
Phase Change ◽  
Phase Change Materials ◽  
In Situ Polymerization ◽  
Urea Formaldehyde ◽  
Agitation Speed ◽  
Urea Formaldehyde Resin ◽  
Formaldehyde Resin ◽  
Mass Ratio

Hexadecane microcapsule phase change materials were prepared by the in-situ polymerization method using hexadecane as core materials, urea-formaldehyde resin and urea-formaldehyde resin modified with melamine as shell materials respectively. Effect of melamine on the properties of microcapsules was studied by FTIR, biomicroscopy (UBM), TGA and HPLC. The influences of system concentration, agitation speed and mass ratio of wall to core were also investigated. The results indicated that hexadecane was successfully coated by the two types of shell materials. The addition of melamine into the urea-formaldehyde resin microcapsule reduced microcapsule particle size and microencapsulation efficiency. The influences of factors such as system concentration, agitation speed and mass ratio of wall to core to different wall materials microcapsules presented different variety trends of the microcapsule particle size.

Preparation of Microencapsulated Phase Change Materials Using Surface Modification Method

2014 ◽  
Vol 902 ◽  
pp. 52-57
Author(s):  
Jin Hua Zhu ◽  
Qing Zhen Wen ◽  
Chao Yu ◽  
Xiong Wei ◽  
Li Qing Zhou
Keyword(s):  
Particle Size ◽  
Surface Modification ◽  
Phase Change ◽  
Phase Change Materials ◽  
Core Material ◽  
Particle Analysis ◽  
Gravimetric Analysis ◽  
Microencapsulated Phase Change Materials ◽  
Modification Method ◽  
Core Materials

With the adoption of surface modification method, microencapsulated phase change materials (MEPCM) with polyurea as wall materials, paraffin as core materials were successfully prepared. This paper made a research on the effect dosage of modifier might have on the content of microcapsule core materials. Findings indicated that the content of microcapsule core materials was relatively high as the dosage of modifier being core material 10 wt%. It was preliminarily proved that polyurea had been coated on the surface of paraffin particles by adopting Fourier Transform Infrared Spectrum (FTIR) to formulate the composition and structure of microcapsules. And the laser particle analysis declared that particle size distribution of microcapsules was narrow with average particle size of 389 μm. Thermo Gravimetric Analysis (TG) and Differential Scanning Calorimetry (DSC) were also employed to make a representation of the thermal properties of microcapsules, and it was shown that microcapsules were of wonderful phase change performance and thermal stability.

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.

Research on the Reaction Condition and Process of Microcapsules via In Situ Polymerization

2011 ◽  
Vol 224 ◽  
pp. 99-103 ◽  
Author(s):  
Chang Zheng Xin ◽  
Li Na Wang ◽  
Yan Wei Wang ◽  
Xiang An Huang
Keyword(s):  
Electron Microscopy ◽  
Phase Change Materials ◽  
In Situ Polymerization ◽  
Influence Factors ◽  
Average Diameter ◽  
Optical Microscope ◽  
Curing Temperature ◽  
The Core ◽  
Microencapsulated Phase Change Materials

Heat-resistant microencapsulated phase change materials (MPCMs) were prepared via in-situ polymerization, with polyurea used as the shell and low melt-point paraffin wax as the core. Optical microscope and Electron microscopy were employed to evaluate the properties and morphology of the materials. The influence factors on polymerization were discussed. Experimental results indicated that the average diameter of 2.5 μm of particles was gained when the emulsification content was 1%, the time of acidification was 60 minutes and the curing temperature was 70°C.

Microstructure regulation of microencapsulated bio-based n-dodecanol as phase change materials via in situ polymerization

2017 ◽  
Vol 41 (23) ◽  
pp. 14696-14707 ◽  
Author(s):  
Hong Zhang ◽  
Wei Li ◽  
Rui Huang ◽  
Ning Wang ◽  
Jianping Wang ◽  
...  
Keyword(s):  
Phase Change ◽  
Phase Change Materials ◽  
In Situ Polymerization

Micronencapsulated bio-based n-dodcanol as phase change materials by in situ polymerization.

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