The Synthesis And Properties Of Poly[9-Bis (Alkylthio) Methylene-9H Fluorene]

The ?-conjugated polymers such as PT,PPV,PF,PPy,PANI have been referred to as the solar cell materials due to its cheap and development potential in the 21st century.Polyfluorenes and its derivatives are widely concerned by scientists all over the world.Because they have a good performance in chemical stability,thermal stability,hole-transporting,and high fluorescence quantum efficiency,easy processing and so on.But the solar cells containing the unites of fluorenes have a lot of disadvantages due to its short absorption wavelength and poor filming.In view of the good film-forming properties and mechanical strength of the acrylic resin we synthesized a series of 9-bis(alkylthio)methylene-9H fluorenes which were focused on its film morphology and photovoltaic properties first,and then discussed their different performances of polymers synthesized by different methods.The target of this research is to obtain the low oxidation potential,thermal stability,narrow-band-gap,wide range of ultraviolet absorption,good film morphology and so on.The research will provide a new way for the research of the new functional polymer materials.Focusing on film-forming property and photovoltaic performance of the polymers.The main contents and results of this research are as follows:1.Starting from the available materials including of KOH,C2H5ONa,Li-C4H9 and fluorene,a series of 9-bis(alkylthio)methylene-9H fluorenes were synthesized and characterizated.2.The 9-bis(alkylthio)methylene-9H fluorenes include of 2a-2d and 3a-3d were polymerized by FeCl3 oxidation in the CHCl3 solution and polyacrylate/CHCl3 mixed solution,respectively,followed with the optical performance testing.3.The by-group including double bond was introduced at 9-position of fluorine.The polymer of 4a and 4b were synthesized by radical polymerized and copolymerized in the toluene/EA mixed solution.Followed with the performance testing.The experiment results show that the polyacrylate taking part in polymerization of substituted fluorenes,ultraviolet absorption wavelength of the polymers(3a-3d)appears redshift.The thermal decomposition temperature of polymers are above 200 ?,which have good thermal stability.The band-gap of polymers(2a-2d,3a-3d and 4a-4b)are between 1.33 and 1.75 eV,which all below poly[9-alkyl fluorine].