| Fullerene(C6o) was found in1985, up to now, it has a long period until it was firstly found. Theoretical calculations of the energetically low-lying, three-fold-degenerate lowest unoccupied molecular orbital, which shoud readily accept up to six electrons in electronchemical reductions or which in chemical conversions. C60combined with other materials(like polymer), it has demonstrated excellent properties like optical electrical, and magnetic performance. Therefore, the explore C6o and its derivatives of in all aspects is the most challenging one work.Due to the solubility of the carbon materials are small, so it is a hot spot that though chemically modified to make the great solubility carbon materials. Due to the polymer shows the good film-forming properties, so in this paper, the polymer-C60optical limiting materials were prepared. This article is focused on the synthesis of C60-polymer covalently grafted compounds, and test theirs optical limiting performance.In this paper, four new C60-based materials have been prepared, and do some research in optical limiting properties.Chapter1reviews the mechanism and the progress of optical limiting, the research progress of C60chemical modified materials and the progress of optical limiting of C60-based materials.Chapter2reports a polymer (PTCF-CHO) prepared by Suzuki coupling reaction. It contains fluorene, carbazole. and benzothiadiazole. After then, though1,3-dipolar addition reaction, we prepared the final compound, PTCF-C60-In UV-Vis and fluorescence spectra, compared the PTCF-CHO and PTCF-C60, they are both consisting the blue shift in PTCF-C60, which show that there may be the energy transfer intra molecular. The cyclic voltammetry curves may also prove the energy transfer. When the C60was added, the phenomenon of fluorescence quenching, it may due to the effect of C60. And they may also prove energy transfer intra molecular. In the study of optical limiting performance, we found that there is no nonlinear performance of PTCF-CHO. And the PTCF-C60shows the better optical limiting performance. When the incident energy increases, its transmission rate is declining. The nonlinear scattering properties of PTCF-C60is increased weakly, it always keep in a low level, indicating that the main optical limiting mechanism of the PTCT-C60is reverse saturable absorption.Chapter3is reports two methods to obtain the polymers which contain fluorene, C6o and triphenylamine. Method one is that firstly we prepared the polymer PTP-CHO though the Suzuki coupling reaction. Then though1,3-dipolar addition reaction grafted to C6o-In UV-Vis spectra and fluorescence spectra, compared the PTP-CHO and PTP-C60, they are both consisting the blue shift in PTCF-C60, which shows that there may be the energy transfer intra molecular. In optical limiting performance study, we also found that, PTP-CHO has good solubility in THF and its optical limiting performance of the test, and get a better optical limiting performance. Method2is that we synthesized small molecules triphenylamine-C60monomers, polymerization is carried out through the Suzuki reaction and fluorenyl boric acid ester, the polymer PTPA-F-C60is obtained. Polymer shows a fairly good solubility in toluene, maybe because the molecular weight is smaller than PTP-C60due to the TPA-C60itself relatively large size, and then and then polymerization is sterically hindered with respect to relatively large.Infrared fluorescent contrast TPA-C60and PTPA-F-C60, it is found that the polymer with respect to the small molecule, the occurrence of a certain blue shift may be conjugated chain electron transport due to polymer reasons. The optical limiting performance of PTPA-F-C60in toluene shows it’s has the good performance of optical limiting. In PTP-C60and PTPA-F-C60, the nonlinear scattering is not their main limiting mechanism, and the main mechanism or reverse saturable absorption.Chapter4reports the polymer PCF-CHO, which containingfluorene and carbazole prepared by the Suzuki coupling reaction. Then grafted to C60though1,3-dipolar addition reaction, that is PCF-C60-By UV fluorescence has found its UV and fluorescence observation bshift, indicating the presence of energy transfer, the same can be proved by electrochemical. Its optical limiting performance is under test. |
