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.

Research on Compound and the Best Proportion of Phase Change Materials Using in Clothes

2011 ◽  
Vol 399-401 ◽  
pp. 1596-1599
Author(s):  
Rou Xi Chen ◽  
Yu Chai Sun
Keyword(s):  
Phase Transition ◽  
Transition Temperature ◽  
Phase Change ◽  
Phase Transition Temperature ◽  
Phase Change Materials ◽  
Eutectic Point ◽  
Eutectic System ◽  
Matlab Software ◽  
Application Fields

The desired phase-transition temperature and enthalpy of phase change materials are different in different application fields. When the composite way is reasonable, the phase-transition temperature and enthalpy of phase change can satisfy the demand of PCMs using in clothes. Based on The theory of eutectic system and the Schroeder Formula, the lowest eutectic point was computed by using MATLAB software in this paper, and then the enthalpy of phase change was also compared in order to get the best proportion of PCMs.

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.

Preparation of Expanded Perlite-Based Binary Eutectic Composite of Phase Change Heat Storage Materials

2011 ◽  
Vol 383-390 ◽  
pp. 2889-2893
Author(s):  
Bao Yun Zhang ◽  
Chang Mei Jiao ◽  
Peng Wang ◽  
Long Jiang ◽  
Bao Hua Ji ◽  
...  
Keyword(s):  
Phase Transition ◽  
Transition Temperature ◽  
Phase Change ◽  
Latent Heat ◽  
Phase Transition Temperature ◽  
Phase Change Materials ◽  
Vacuum Impregnation ◽  
Expanded Perlite ◽  
Good Thermal Stability ◽  
Binary Eutectic

The binary eutectic of lauric acid-stearic acid / expanded perlite composite phase change materials (PCM) was prepared using the method of vacuum impregnation. The structures and properties of this composite PCM were characterized by FT-IR, SEM, DSC and TG analysis. The results showed that the binary eutectic of fatty acid had been composed with porous skeleton expanded perlite completely in a physical method, the phase transition temperature of composite PCM was about 33.0 °C and latent heat was 131.3 J/g. it had a good thermal stability after 100 times of recycling and gave the phase transition temperature 33.5 °C and the latent heat of 128.1 J/g respectively.

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.

Investigation and Development on Phase Transition Temperature Control and Adjustment of Inorganic Salt Hydrates

2012 ◽  
Vol 550-553 ◽  
pp. 2644-2648
Author(s):  
Hai Ming Gu ◽  
Xiao Qin Zhu ◽  
Zi Yue Zhu ◽  
Jin Hu ◽  
Hui Yuan Zhao ◽  
...  
Keyword(s):  
Phase Transition ◽  
Transition Temperature ◽  
Energy Storage ◽  
Phase Transition Temperature ◽  
Temperature Control ◽  
Thermal Energy ◽  
Phase Change Materials ◽  
Inorganic Salt ◽  
Salt Hydrates ◽  
Made In

Whereas inorganic salt hydrates are typical inorganic phase change materials suitable for the temperature range of 0-150°C, their investigation and applications on thermal energy storage have received more and more during the recent years. A review on investigation progress and applications of their phase transition temperature control and adjustment was made in this paper, which is of important reference and practical value for understanding and predominating the investigation and engineering applications on their phase transition temperature control and adjustment.

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.

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