Adjusting phase change temperature of microcapsules by regulating their core compositions

摘要

A series of polyurea/polyurethane microencapsulated butyl stearate and paraffin as binary core material was successfully synthesized via interfacial polymerization method. The phase change temperature of these microencapsulated phase change materials can be adjusted by regulating the composition of the binary core. SEM photographs showed that micro-PCMs had relatively spherical profiles and compact surfaces with diameter ranging from 5 to 15 μm. DSC results indicated that the binary core content in micro-PCMs was in a range of 40 to 60%. Moreover, after being treated under 50 ℃ for 7 days or subjected to thermal-cycling test for 500 times, the micro-PCMs kept excellent thermal performances and stabilities. Besides, these micro-PCMs showed excellent thermal stability and they decomposed in three steps at considerably high temperature above 190 ℃.