Fabrication and characterization of microencapsulated n-octadecane with different crosslinked methylmethacrylate-based polymer shells

Qiu, Xiaolin; Li, Wei; Song, Guolin; Chu, Xiangxiang; Tang, Guoyi

doi:10.1016/j.solmat.2011.11.018

Cited by 138 publications

(63 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The exothermic nature of this reaction is confirmed with the DSC results. This agrees well with the testing of other microcapsules in the literature [16][17][18][19][20]. The moving of the exothermic peak represents only a negligible decrease in thermal stability of the PCM in plasterboard when compared to testing PCM microcapsules without the plasterboard.…”

supporting

confidence: 90%

Fire Performance of Phase Change Material Enhanced Plasterboard

2017

View full text Add to dashboard Cite

Abstract. Sustainable construction materials are increasingly being used to reduce the carbon footprint of modern buildings. These materials have the potential to change the fire dynamics of compartments by altering the compartment energy balance however there is little quantitative understanding of how these materials behave in the event of a real fire. The changes in fire dynamics may be due to increased fuel load in a compartment, reduced time to failure or promotion of flame spread. The objective of this research is to quantify how Phase Change Materials (PCMs) perform in realistic fire scenarios. It was found that a plasterboard product containing microencapsulated PCMs will behave similarly to a charring solid and have the potential to contribute significant fuel to a compartment fire but that they maintain integrity for the duration of flaming period. The critical heat flux for this product was determined in the cone calorimeter to be 17.5 ± 2.5 kW m . Sample orientation was found to increase the peak heat release rate by up to 25%, whilst having little to no effect on the mass loss rate. These parameters, in addition to the in-depth temperature evolution and ignition properties, can be used as design criteria for balancing energy savings with quantified fire performance.

show abstract

supporting

confidence: 90%

Fire Performance of Phase Change Material Enhanced Plasterboard

2017

View full text Add to dashboard Cite

show abstract

“…8 [50] n-octadecane was encapsulated with a PDVB shell to obtain an average size of 1.5μm MEPCM. X. Qiu et al [51] produced nanoencapsulated n-octadecane with different polymer shells (1,4-butyleneglycol diacrylate (BDDA), divinyl benzene (DVB), trimethylol propane triacrylate (TMPTA) and pentaerythritol tetraacrylate (PETRA)). Their thermal properties, thermal resistant temperatures and shell mechanical strength of capsules were enhanced by increasing the level of cross-linking agents.…”

Section: Suspension Polymerizationmentioning

confidence: 99%

Review of solid–liquid phase change materials and their encapsulation technologies

Darkwa

Kokogiannakis

2015

Renewable and Sustainable Energy Reviews

711

267

View full text Add to dashboard Cite

Various types of solid-liquid phase change materials (PCMs) have been reviewed for thermal energy storage applications. The review has shown that organic solid-liquid PCMs have much more advantages and capabilities than inorganic PCMs but do possess low thermal conductivity and density as well as being flammable. Inorganic PCMs possess higher heat storage capacities and conductivities, cheaper and readily available as well as being non-flammable, but do experience supercooling and phase segregation problems during phase change process. The review has also shown that eutectic PCMs have unique advantage since their melting points can be adjusted. In addition, they have relatively high thermal conductivity and density but they possess low latent and specific heat capacities. Encapsulation technologies and shell materials have also been examined and limitations established. The morphology of particles was identified as a key influencing factor on the thermal and chemical stability and the mechanical strength of encapsulated PCMs. In general, in-situ polymerization method appears to offer the best technological approach in terms of encapsulation efficiency and structural integrity of core material. There is however the need for the development of enhancement methods and standardization of testing procedures for microencapsulated PCMs. Abstract: Various types of solid-liquid phase change materials (PCMs) have been reviewed for thermal energy storage applications. The review has shown that organic solid-liquid PCMs have much more advantages and capabilities than inorganic PCMs but do possess low thermal conductivity and density as well as being flammable. Inorganic PCMs possess higher heat storage capacities and conductivities, cheaper and readily available as well as being non-flammable, but do experience supercooling and phase segregation problems during phase change process. The review has also shown that eutectic PCMs have unique advantage since their melting points can be adjusted. In addition they have relatively high thermal conductivity and density but they possess low latent and specific heat capacities. Encapsulation technologies and shell materials have also been examined and limitations established. The morphology of particles were identified as a key influencing factor on the thermal and chemical stability and the mechanical strength of encapsulated PCMs. In general, in-situ polymerization method appears to offer the best technological approach in terms of encapsulation efficiency and structural integrity of core material. There is however the need for the development of enhancement methods and standardization of testing procedures for microencapsulated PCMs.

show abstract

“…This seems to suggest that crosslinking can increase the mechanical strength of the microPCMs. The higher mechanical strength of the crosslinked microPCMs can resist the particle shells shrinkage brought about the difference in density between the copolymer shell and the shell forming monomers, 31 and also resist external pressure resulting from post-treatment of the samples, such as centrifugation.…”

Section: Morphologies Of Microcapsulesmentioning

confidence: 99%

Preparation and characterization of flame retardant phase change materials by microencapsulated paraffin and diethyl ethylphosphonate with poly(methacrylic acid‐co‐ethyl methacrylate) shell

Qiu

Chen

2015

J of Applied Polymer Sci

Self Cite

View full text Add to dashboard Cite

Microcapsules containing paraffin and diethyl ethylphosphonate (DEEP) flame retardant with uncrosslinked and crosslinked poly (methacrylic acid-co-ethyl methacrylate) (P(MAA-co-EMA)) shell were fabricated by suspension-like polymerization. The surface morphologies of the microencapsulated phase change materials (microPCMs) were studied by scanning electron microscopy. The thermal properties and thermal stabilities of the microPCMs were investigated by differential scanning calorimetry (DSC), and thermal gravimetric analysis (TGA). The flame retarding performances of the microcapsule-treated foams were calculated by using an oxygen index instrument. The DSC results showed that the crosslinking of the polymer shell led to an increase in the melting enthalpies of the microcapsule by more than 15%. The crosslinked P(MAA-co-EMA) microcapsules with DEEP and without DEEP have melting enthalpies of 67.2 and 102.9 J/g, respectively. The TGA results indicated that the thermal resistant temperature of the crosslinked microcapsules with DEEP was up to 171 C, which was higher than that of its uncrosslinked counterpart by 20 C. The incorporation of DEEP into the microPCM increased the limiting oxygen index value of the microcapsule-treated foams by over 5%. Thermal images showed that both microcapsule-treated foams with and without DEEP possessed favorably temperature-regulated properties. As a result, the microPCMs with paraffin and DEEP as core and P(MAA-co-EMA) as shell have good thermal energy storage and thermal regulation potentials, such as thermal-regulated foams heat insulation materials.

show abstract

Fabrication and characterization of microencapsulated n-octadecane with different crosslinked methylmethacrylate-based polymer shells

Cited by 138 publications

References 26 publications

Fire Performance of Phase Change Material Enhanced Plasterboard

Fire Performance of Phase Change Material Enhanced Plasterboard

Review of solid–liquid phase change materials and their encapsulation technologies

Preparation and characterization of flame retardant phase change materials by microencapsulated paraffin and diethyl ethylphosphonate with poly(methacrylic acid‐co‐ethyl methacrylate) shell

Contact Info

Product

Resources

About