| 초록 |
Polydiacetylene (PDA) and its derivative comprise an important class of conjugated polymers, with the unique characteristics of self-assembly, and radiation (UV or γ-ray) induced polymerization in the absence of chemical initiators or catalysts. It can be used chemosensor and photonic materials to emit red-fluorescence of changing electric transition state by external stimulations, such as heat, solvent, mechanical stress, and molecular recognition. In this research, micron-sized patterns of polydiacetylene (PDA) and polydiacetylene isophthalic acid (PCDA-IPA) are fabricated on Ti substrate using micromolding in capillaries (MIMIC). In MIMIC technique, the surface-patterned polydimetylsiloxane (PDMS) slab is placed on the surface of a substrate; the patterned structure on the PDMS forms a network of empty channels. We have fabricated various sized patterns of polydiacetylene liposome and microfiber by micromolding in capillaries (MIMIC) technique with PDMS mold. SEM, AFM and fluorescence microscopy have revealed the morphology and blue-to-red phase transition of the patterned PDA liposome structures and self-assembled PDA-IPA fiber structures. This investigation has led to the development of a new strategy for the fabrication of conjugated polymer patterns on the solid substrates. When combined with the novel optical properties of polydiacetylene, this methodology should be enhanced the versatility of conjugated polymers in sensor and optical applications. |
