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.

Structure and properties of urea-formaldehyde resin/polyurethane blend prepared via in-situ polymerization

RSC Advances ◽  
2015 ◽  
Vol 5 (66) ◽  
pp. 53700-53707 ◽  
Author(s):  
Junling Yuan ◽  
Xiaowen Zhao ◽  
Lin Ye
Keyword(s):  
Energy Dissipation ◽  
In Situ Polymerization ◽  
Microphase Separation ◽  
Urea Formaldehyde ◽  
Urea Formaldehyde Resin ◽  
Polymerization Reaction ◽  
Formaldehyde Resin ◽  
Structure And Properties ◽  
Toughening Mechanism

UF/PU blends with improved toughness were preparedvia in situpolymerization. PU participated in the polymerization reaction of UF. The reaction-induced microphase-separation indicated the energy-dissipation toughening mechanism.

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 Characterization of MicroPCMsContaining Paraffin

2012 ◽  
Vol 430-432 ◽  
pp. 647-650
Author(s):  
Dian Wu Huang ◽  
Yuan Lian ◽  
Hong Mei Wang
Keyword(s):  
Particle Size ◽  
Thermal Properties ◽  
Energy Storage ◽  
Phase Change ◽  
Phase Change Materials ◽  
In Situ Polymerization ◽  
Particle Size Analyzer ◽  
Good Potential

Microcapsules containing paraffin phase change materials with MMA-MAA copolymer shell were synthesised by in situ polymerization. The Structure, diameter, encapsulation ratio of paraffin and thermal properties of the prepared microcapsules were investigated by using FTIR, ELS particle size analyzer, differential scanning calorimeter (DSC), thermogravimetic analysis (TGA). This encapsulated phase change paraffin could have good potential for energy storage.

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.

The Research of the Phase Change Materials Enclosed by β-CD

2011 ◽  
Vol 374-377 ◽  
pp. 352-356
Author(s):  
Sheng Jun Fu ◽  
Bo Liu ◽  
Wu Biao Duan ◽  
Jin Chang
Keyword(s):  
Phase Change ◽  
Phase Change Materials ◽  
Urea Formaldehyde ◽  
Urea Formaldehyde Resin ◽  
Formaldehyde Resin ◽  
Related Research ◽  
Enclosure Method ◽  
The Common ◽  
Wall Materials

This paper demonstrates that β-CD which encloses industrialized paraffin, one of the phase change materials, is utilized to prevent the leak of the paraffin. The enthalpy of the phase change materials which are enclosed is studied by characterizing of DSC. The result shows that the enthalpy of paraffin which has been enclosed by β-CD is increased by 29%. The related research contents had not been reported in literature. This method, compared with the common encapsulation of paraffin by wall materials, like the urea formaldehyde resin, not only is a new exploration on the enclosure method and the increasing of the enthalpy of the phase change materials, but also meets the requirement of enviromental protection.

Synthesis and Properties of Microencapsulated Solid Paraffin Phase Change Materials

2012 ◽  
Vol 519 ◽  
pp. 1-5
Author(s):  
Zhe Xu ◽  
Jian Qiang Li ◽  
Guo Cai Zhang
Keyword(s):  
Phase Change ◽  
Phase Change Materials ◽  
In Situ Polymerization ◽  
Liquid Paraffin ◽  
Polymerization Process ◽  
Experimental Investigations ◽  
Formaldehyde Resin ◽  
Latent Heat Storage ◽  
Total Enthalpy ◽  
Solid Paraffin

To prepare the phase change materials for efficient low-temperature latent heat storage, microcapsules with commercial solid paraffin were synthesized by using in-situ polymerization process. Liquid paraffin was used first as core materials since it facilitates the direct observation of containment by the shell of melamine-formaldehyde resin (MF resin), and examines easily the optimal synthesizing condition. The effects of emulsion processes, pre-polymerization conditions, shell material content and reaction time on the quality of microcapsules were investigated. The experimental investigations show that the optimal process of synthesizing liquid paraffin microcapsules is adoptable to that of solid paraffin microcapsules. The as-prepared solid paraffin microcapsules show high quality. The microcapsules surface was smooth and dense, and be free of any adhesion. The measurements show that in the microcapsules solid paraffin was well encapsulated by MF resin. The microcapsule size was almost within the range of 6~33 μm and most intense distribution at 23 μm. DSC measurements gave two endothermic peaks with initial phase change temperature at 35°C and 50°C respectively, and the total enthalpy was above 134 J/g.

The Preparation of Microcapsules Used for Self-Healing Composites

2011 ◽  
Vol 233-235 ◽  
pp. 2319-2322 ◽  
Author(s):  
Ru Tian ◽  
Yu Dong Zheng ◽  
Xin Liang ◽  
Zhang Ming Zhou ◽  
Xiao Li Fu ◽  
...  
Keyword(s):  
In Situ Polymerization ◽  
Ph Value ◽  
Condensation Reaction ◽  
Formaldehyde Resin ◽  
Self Healing ◽  
Mass Ratio ◽  
Melamine Formaldehyde ◽  
Stirring Rate ◽  
The Stability

Microcapsules were prepared by in situ polymerization of melamine-formaldehyde resin to form shell over oxygen resin droplets. Stirring rate, temperature, pH value as well as mass ratio of shell and core are the main parameters affecting the stability of microcapsules. High stirring rate leads to small size of microcapsules. The temperature influences the speed of the reaction and the morphology. The pH value decides whether the condensation reaction can take place. The size of microcapsules is about 15-61um.

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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