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Molecular orientation in electrospun poly(butylene terephthalate) nanofibers

L.H. Catalani, G. Collins and M. Jaffe
University of Sao Paulo, BR

Keywords:
electrospinning, nanofiber, cell scafold, poly(butylene terephthalate)

Abstract:
In this work, poly(butylene terephthalate) (PBT) electrospun fibers were produced by conventional electrospinning technique. All typical parameters dependences were studied. Typical behavior was observed for all parameters. In addition, we have analyzed molecular features of the produced fibers. PBT electrospun fibers showed a high level of birefringence, which extinguished upon melting, suggesting chain orientation in amorphous phase. Thermally Stimulated Current (TSC), a dipole relaxation technique, was used to probe for dipole orientation. A spontaneous current was released near the glass transition indicating dipole relaxation for a non-equilibrium, oriented state produced during electrospinning of PBT. Moreover, a relative large amount of space charge is trapped on is surface. These two observations may play important role when using these materials in cell culture applications.

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