| 초록 |
Thermally expandable microcapsules (TEMs) were synthesized by high pressure Pickering suspension polymerization. The shell consists of acrylonitrile copolymer and the core consists of n-octane. 1,4-Butanediol dimethacrylate (BDDMA) was used as a crosslink agent and Halloysite nanotubes were used as a Pickering stabilizer. The contents of halloysite nanotubes affect the stability of the Pickering emulsions as well as thermal properties of the microcapsules. After polymerization, when increasing the contents of halloysite nonotubes, contents of encapsulated hydrocarbon decreased. To figure out the expansion properties of microcapsules, the blowing properties of the TEMs were carried out in convection oven. We found the largest expansion at 0.25 wt. %, and the smallest expansion at 3 wt. % of halloysite nanotubes. The morphology and the thermal stability of microcapsules were analyzed by scanning slectron microscope (SEM) and thermogravimetric analysis (TGA). |
