Synthesis And Characterization Of Functional Materials Polysilanes Applications

Polysilane is a material of polymer whose backbone is made up of silicon. Owing to the low and unoccupied 3d orbitals of silicon which allow significant delocalization of o electrons along the polymer chain. This gives polysilanes highly unusual properties such as photoconduct, nonlinear optic, photoluminescence (PL) and electroluminescence (EL) etc. Which is the very reason why polysilanes gained extensive attention.Four series of polysilanes have been synthesized by Wurtz coupling reaction and characterized with FT-IR, 'H-NMR, UV/Vis spectroscopies as well as GPC. Their PL properties are tested with fluorescent (FL) spectroscopy and some polysilanes have good photoluminescent property.The photochemistry of polysilanes has been studied by irradiating solutions of three series of polysilanes at wavelengths of 254nm and 365nm and is detected with UV spectroscopy. The result shows that the absorption of dialkyl polysilane decreases but alkylarkyl polysilane shifts to shorter wavelength while the time of irradiation become longer. And the absorption of modified polysilanes almost has no change when they are irradiated. In addition, the degradation of polysilanes at wavelength 365nm is easier than at 254nm.The way of synthesizing polysilanes with modified Grinard reagents is studied. Comparing to tradional Wurtz coupling, the conditions of reaction are milder and the danger of reagents are safer than its.Electroluminescence of the polysilane is studied by select sandwich's structure and electroluminescence device is made.