| 초록 |
The biodegradable poly(ε-caprolactone) (PCL)/poly(ethylene imine) (PEI) microcapsules containing Al2O3 and fragrant oil were prepared with differentconcentrations of PEI. The prepared microcapsules were investigated in the effect of an addition of PEI. The effect of PEI content on the diameter and shape of microcapsules were observed in image analyzerand scanning electron microscope (SEM), respectively. As a result, inclusion of fragrant oil into microcapsules was determined by the presence of specific peak of fragrant oil, i.e., 2935 cm-1, 1440 cm-1, 880 cm-1, through FT-IR. The surface morphologies of the PCL/PEI microcapsules were changed from smoothsurfaces 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. |
