Composite Of Inorganic Functional Nanomaterials With Polymer Nanofibers

Electrospinning has been extensively explored as a simple and versatile method for drawing fibers from polymer solutions (or melts). In a typical process, the polymeric fluid is extruded from the orifice of a needle to form a small droplet in the presence of an electric field. When the electric field is sufficiently strong, charges built up on the surface of the droplet will overcome the surface tension to induce the formation of a liquid jet that is subsequently accelerated toward a grounded collector. As the solvent is evaporating, this liquid jet is stretched to many times its original length to produce continuous, ultrathin This kind of fibers has very large surface area to volume ratio (this ratio for a nanofiber can be as large as 103 times of that of a microfiber) and hollow (a tubule) shape compared with any other known form of the material. By means of electrospinning technique, composite of inorganic nanoparticles with polymer realizes the patterning of nanofibers and the fabrication of functional composite nanofibers. Two species of porphyrins (twenty-five 25 kinds) were synthesized, the one is liquid crystal of 5, 10, 15, 20-tetrakis (4-n-alkanoyloxyphenyl) porphyrin and its Co(II) and Ni(II) complexes(eighteen kinds), and the other one is 5, 10, 15, 20-tetrakis (4-n-fluoro benzoyloxy) porphyrin and its Fe(III), Mn(III), Co(II), Ni(II), Cu(II), Zn(II) complexes(seven kinds). The structures and compositions of porphyrins were characterized by UV-Vis, IR photoacoustic spectrum, HNMR, elementary analysis and molar conductance. The liquid crystal behaviors were studied by DSC and polarization microscope. We incorporated five kinds of porphyrins such as TPPPNi, TDPPNi, TSPPNi, TFBOPPH2 and TFBOPPZn into polymer, and gained difference self-assembly patterns by electrospinning. Many parameters can influence the patterns of fibers. These parameters include (a) the kinds of solvent, polymer and porphyrin, (b) the solution properties.