Preparation and Characterisation of Phase Change Material-Loaded Polyurea Microcapsules Several Hundred Micrometres in Diameter

Autor:	Yasuo Hatate, Kouichiro Shiomori, Shiro Kiyoyama, Tomonori Nagayoshi, Takayuki Takei, Masahiro Yoshida
Rok vydání:	2009
Předmět:	Materials science Polymers and Plastics Aqueous two-phase system Isocyanate chemistry.chemical_compound Monomer Differential scanning calorimetry chemistry Chemical engineering Diamine Polymer chemistry Materials Chemistry Ceramics and Composites Amine gas treating Polyurea Tetradecane
Zdroj:	Scopus-Elsevier
ISSN:	1478-2391 0967-3911
Popis:	In the present study, we attempted to prepare phase-change material (PCM)-loaded polyurea microcapsules several hundred micrometres in diameter via oil-in-water emulsion polymerisation. An oil phase with two types of isocyanate monomers (2,4-toluene diisocyanate (TDI) and phenyl isocyanate (PI)) and tetradecane as PCM was dispersed in an aqueous phase with hexamethylene diamine (HMD). The polyurea shell of microcapsules was formed by reaction of the isocyanate monomers with the amine groups derived from HMD and hydrolysed isocyanate monomers. A suitably adjusted agitation rate made it possible to prepare the required microcapsules. An increased molar ratio of TDI to PI in oil phase resulted in improvement of microcapsule morphology. Increased weight ratio of tetradecane to the two isocyanate monomers (TDI and PI) led to an increase in the PCM content in the microcapsules, which is preferable for practical applications. An examination using differential scanning calorimetry analyser demonstrated that the polyurea shell of the microcapsules scarcely influenced the thermal properties of encapsulated tetradecane.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::89c78dd1746d0dd62eefb4edc7fb4911 https://doi.org/10.1177/096739110901700604 Zobrazit plný text záznamu