| 초록 |
Microcapsule based on azido-polyurethane(azido-PU) is functionalized on surface through azido-alkyne click reaction. The pre-polymer of Azido-PU was synthesized using by poly(GAP-co-THF) diol and MDI. Microcapsules were synthesized by emulsion polymerization at the interface of oil with prepolymer in water with chain extender such as 1,4-butandiol. The synthesized microcapsule’s shell have azido functional group so it could be azido-alkyne click reaction with solvatochromic dye. When solvatochromic dye contacts with solvent, the dye’s color can change depending on degree of polarity. In order words, When solvatochromic microcapsules are cracked by external stimulus, the dye on microcapsule shell contacts with flowed internal solvent by crack and we can see the color change of the microcapsules. It is possible to detect where microcapsules cracked. Thus, it can be applied to crack detecting sensor such as matrix or film containing solvatochromic microcapsules. |
