| 초록 |
The biodegradable poly(-caprolactone) (PCL)/poly(ethylene imine) (PEI) microcapsules containing Al2O3 and fragrant oil were prepared with various concentrations of PEI. The prepared microcapsules were investigated in the effect of an addition of PEI. Inclusion of fragrant oil into microcapsules was confirmed by 2935 cm-1, 1440cm-1, 880cm-1 peak through FT-IR. The effect of PEI content on the diameter and shape of microcapsules were observed in image analyzer and scanning electron microscope (SEM), respectively. As a result, the surface morphologies of the PCL/PEI microcapsules were changed from smooth surfaces to skin-like rough surfaces with an addition of PEI. The average particle size of the PCL/PEI microcapsules was increased with increasing the PEI concentration. Also, the release rate of the fragrant oil from microcapsules was increased with increasing the PEI concentration. Theses results could be explained that PEI was swollen well in hydrophilic solution due to its hydrophilic nature. |
