| Title |
Aukštos tripletinės būsenos energijos karbazolilfragmentą turinčių monomerų bei polimerų sintezė ir savybės / |
| Translation of Title |
Synthesis and properties of high-triplet-energy carbazole-based monomers and polymers. |
| Authors |
Šimkus, Gintautas |
| Full Text |
|
| Pages |
58 |
| Keywords [eng] |
carbazole ; polymer ; photocross-linking ; triplet energy |
| Abstract [eng] |
New carbazole-based monomers and polymers were synthesized. Photocross-linking of monomers containing epoxypropyl, oxetanyl and vinyloxethyl groups was performed and their polymerization kinetics were investigated. The monomer containing epoxypropyl groups exhibited the highest conversion in photopolymerization (78 %). Low molecular weight compounds and polymers containing isolated carbazole chromophores were synthesized by arylation reactions between 9-buthylcarbazole and aromatic diketones. Novel and convenient synthesis of helicene derivative was found and described. The thermal, optical, electrochemical and photoelectrical properties of the synthesized compounds were investigated. Photocross-linking reactions products exhibited higher thermal stability than corresponding cross-linkable monomers or low molecular weight compounds. Their destruction temperatures are in the range of 375–486 oC. Synthesized carbazole derivatives exhibited ability of glass formation with the glass transition temperatures up to 120 oC for low-molecular-weight compounds and those observed for polymers ranging from 89 to 150 oC. The synthesized compounds absorb electromagnetic irradiation up to 420 nm and exhibit fluorescence in violet-blue region. The triplet energies of compounds were calculated from phosphorescence spectra. Indole containing derivatives showed the highest triplet energy values (up to 2.98 eV). The electron photoemission spectra of the layers of the synthesized compounds revealed ionization potentials of 5.20–5.49 eV. The lowest ionization potential value was obtained for the helicene derivative. The time-of-flight technique was used to characterize charge transporting properties. The synthesized compounds are capable of charge transporting. The highest hole drift mobility, exceeding 10-3 cm2/V×s at high electric field, was observed in the amorphous layer of the helicene derivative. |
| Dissertation Institution |
Kauno technologijos universitetas. |
| Type |
Master thesis |
| Language |
Lithuanian |
| Publication date |
2016 |
