Abstract
It was tried to microencapsulate erythritol as a phase change material with the interfacial polycondensation reaction method by using the (W/O) emulsion and to characterize the microcapsules prepared. In the experiment, toluene diisocyanate, diphenyl methane diisocyanate and hexamethylenediisocyanate were used to form the polyurethane shell and the effects of them on the heat storage density and the microencapsulation efficiency were investigated. Furthermore, the effect of supercooling prevention agent on the phase change behavior of erythritol was investigated. The microcapsules prepared with toluendiisocyanate monomer showed the highest heat storage density and the higher microencapsulation efficiency. Considerable supercooling phenomenon in the microcapsule was observed and prevented to a certain degree by addition of potassium dihydrogen phosphate and calcium sulfate as the supercooling prevention agent.
Highlights
Many kinds of microcapsules have been developed and applied to the various fields such as cosmetics, drugs, textile, food industry, information, information recording materials and so on [1]-[4].For an example, many kinds of microcapsules containing the phase change material (PCM) have been pre-How to cite this paper: Hayashi, Y., Fuchigami, K., Taguchi, Y. and Tanaka, M. (2014) Preparation of Microcapsules Containing Erythritol with Interfacial Polycondensation Reaction by Using the (W/O) Emulsion
The microcapsules applied in this field have been prepared with the chemical preparation methods such as the in-situ polymerization method, the interfacial polycondensation method and the suspension polymerization method
On applying the microcapsules to the latent heat storage technology, many kinds of paraffin waxes, fatty acids and fatty alcohols have been adopted as PCM because of the wide range of melting points [13]-[17]
Summary
Many kinds of microcapsules have been developed and applied to the various fields such as cosmetics, drugs, textile, food industry, information, information recording materials and so on [1]-[4]. On applying the microcapsules to the latent heat storage technology, many kinds of paraffin waxes, fatty acids and fatty alcohols have been adopted as PCM because of the wide range of melting points [13]-[17] As these materials are inflammable, the microcapsules containing these materials as PCM can not be largely used in the fields such as the interior materials of buildings and cars and textiles. Et al tried to microencapsulate sodium phosphate dodecahydrate as a PCM with in situ polymerization and solvent evaporation method and investigated the thermal properties of microencapsulated PCM [20] It seems that there are no fundamental works with regard to the preparation of microcapsules containing the water soluble PCMs by the interfacial polycondensation reaction method. The purposes of this study are to investigate whether the microcapsules containing the aqueous solution of erythritol as the water soluble PCM can be prepared or not, to obtain the fundamental informations for preparing the microcapsules with the interfacial polycondensation reaction method by using the (W/O) emulsion and to characterize the microcapsules
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