Regulation Of Poly(3-butylthiophene) Film Morphoogy And Its Phase Transition Behavior

In this paper，we choose Poly-(3-butylthiophene)(P3BT) as the research object.Effect of rotate shear flow field on the structure and morphology of P3BT nanowireswas studied by Atomic Force Microscope (AFM), Transmission Electron Microscope(TEM), Infrared Spectroscopy (FTIR) and Wide-angle X-ray Diffraction (WAXD).Besides, we try to find an effective new method for preparation of P3BT Form IIcrystal and its phase transition behavior was investigated by mentioned methods.It is found that the rotation field can accelerate the formation of P3BT nanowires inanisole solvent and improve its yields. However, the speed of rotation has no effect onthe morphology and structure of P3BT nanowires. The isolation&purification ofP3BT nanowires can be completed by vacuum filtration. The Form I′crystal of P3BTnanowires was determined via FTIR and WAXD. Meanwhile, the transformation fromForm I′to Form I in temperature-rise period was studied by Synchrotron RadiationSource.The Form II crystal of P3BT can be prepared by the treatment of CS2solvent steam,which was difficult to be repeated. The P3BT/CS2solution was put in the lowtemperature (-10oC) ageing for a long time and the P3BT Form II crystal was prepared,which is the bundle structure. The P3BT film with the Form II crystal was prepared bymeans of coprecipitation. The structural change in crystal transformation process fromForm II to Form I was researched in detail via synchrotron radiation X-Ray andVariable Temperature FTIR. The results show that the crystal transformation fromForm II to Form I occur at120-160oC. The phase transition is not a simply solid-solidphase transition process which refer to the increasing of interval of the a axis, theeffective conjugation length, and the side chain conformation degree order and the reducing of interval of the b axis.