Synthesis and properties of microencapsulated n

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• 作者：Huanzhi Zhang ; Xiaodong Wang
• 关键词：Microcapsules ; Phase change materials ; n-Octadecane ; Microstructure ; Properties
• 刊名：Solar Energy Materials and Solar Cells
• 出版年：2009
• 出版时间：August 2009
• 年：2009
• 卷：93
• 期：8
• 页码：1366-1376
• 全文大小：853 K

文摘

Microencapsulated n-octadecane with polyurea shells containing different soft segments were synthesized using 2,4-tolylene diisocyanate as an oil-soluble monomer and various amines as a water-soluble monomer through interfacial polycondensation. The Fourier transform infrared spectra and optical phase-contrast microscope confirmed that these polyurea shell materials were successfully fabricated onto the surface of n-octadecane. The morphological investigation suggested that the microcapsules synthesized using Jeffamine as the amine monomer had a smoother and more compact surface than those synthesized by ethylene diamine and diethylene triamine, and they possessed a larger particle size (about 16 μm) with a centralized size distribution as well. These microcapsules also exhibited much better phase change properties, higher encapsulation efficiency, and better anti-osmosis property than the other two. In addition, the microcapsules synthesized with a core/shell weight ratio of 70/30 are optimal when used as microencapsulated phase change materials.