| 초록 |
Nanoporous polynorbornene (PNB) thin films were obtained with PNB copolymers grafted with thermally labile polylactide (PLA). Thermally stable PNB acts as a matrix while PLA side chains generate nanopores within the matrix. The PNB main chains were polymerized by the vinyl addition polymerization and PLA side chains were grafted to the main chain by ring opening polymerization. The PLA chains were found to thermally decompose at 250 ℃. In thin films, the PNB matrix was stable during the pore generating process at 250 ℃ for 1hr. It is found that the refractive index as well as the porosity of the porous PNB thin films could be controlled by varying the molecular weight of grafted PLA. To increase the thermal and mechanical stability, we introduced the crosslinkable epoxy groups to PNB matrix and obtained much porous PNB thin films. Nanopores in PNB thin films were characterized by ellipsometry, cross sectional FE-SEM and TEM. |
