Abstract
Poly(divinylbenzene) (PDVB) microcapsules containing octadecane (OD) (PDVB/OD) used as heat storage material were synthesized by suspension polymerization at 70 Microencapsulation, Microcapsule, Heat Storage Material, Octadecane, Suspension Polymerization, Poly(Divinylbenzene)C using benzoyl peroxide and polyvinyl alcohol as initiator and stabilizer, respectively. Thermal properties and stability of PDVB/OD microcapsules were determined using differential scanning calorimeter (DSC) and thermogravimetric analyzer. The morphology and structure of microcapsules were characterized by optical microscope, scanning electron microscope and fourier transform infrared spectrophotometer. From DSC analysis, the melting temperature of encapsulated OD (28oC) was almost the same as that of bulk OD (30oC) while it was quite different in the case of the solidification temperature (19oC and 25oC for encapsulated and bulk OD, respectively). The latent heats of melting (184.0 J/g-OD) and solidification (183.2 J/g-OD) of encapsulated OD were reduced from those of bulk OD (241.7 and 247.0 J/g, respectively). However, the prepared PDVB/OD microcapsules are able to be used for heat storage applications.
Highlights
The utilization of a latent heat storage system using heat storage materials or phase change materials (PCMs) is an effective method of advanced energy technologies, preserving available energy and improving its consumption
The prepared PDVB/OD microcapsules are able to be used for heat storage applications
As the total surface area of the microcapsules increased comparing to bulk OD, these PDVB/OD capsules are quite acceptable for energy storage applications even having a slightly lower latent heats
Summary
The utilization of a latent heat storage system using heat storage materials or phase change materials (PCMs) is an effective method of advanced energy technologies, preserving available energy and improving its consumption. The thermal energy storage systems typically select the application temperatures approach phase transition temperatures of PCMs. Paraffin waxes (the linear chain hydrocarbons or n-alkanes) such as tetradecane (TD), hexadecane (HD), octadecane (OD), nonadecane (ND), and eicosane are useful as one group of numerous numbers of heat storage materials that melt and solidify at a wide range of temperatures, making them attractive for many applications [11]. Paraffin waxes (the linear chain hydrocarbons or n-alkanes) such as tetradecane (TD), hexadecane (HD), octadecane (OD), nonadecane (ND), and eicosane are useful as one group of numerous numbers of heat storage materials that melt and solidify at a wide range of temperatures, making them attractive for many applications [11] These PCMs are nontoxic, non-corrosive, chemically inert, obtained, and have no unpleasant odor. The morphology, chemical structure, thermal stability and thermal properties of PDVB/OD capsules were characterized by scanning electron microscope (SEM), optical microscope (OM), fourier transform infrared spectrophotometer (FT-IR), thermogravimetric analyzer (TGA) and differential scanning calorimeter (DSC), respectively
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