| 초록 |
Coumarin residues were conjugated to poly(vinyl alcohol) (PVA) by reacting epoxypropoxy coumarin (EPC) with the polymer. A cyclic photo-dimerization and dedimerization of EPC of PVA-EPC conjugate was observed under a cyclic irradiation of 365 nm and 254 nm of UV light. The slating-out of the conjugate significantly took a place in the range of 0 M - 2 M NaCl, and the phenomenon was observed at a lower concentration than that of unmodified PVA was. Oil-in-water emulsion was prepared as a template for the preparation of hollow microcapsules using chloroform as an oil phase and PVA-EPC as an emulsifier. The wall surrounding droplets was built-up by the salting-out of PVA-EPC,and it was cross-linked by the irradiation of 365 nm. After chloroform was evaporated and salt was removed by a dialysis, hollow microcapsules were successfully obtained. |
