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Title: Processing-structure-property-relationship in electrospun polymer nanofibers
Keywords: Polymer, Nanofibers, Morphology, Molecular Structure, Tensile Property, Electrospinning
Issue Date: 10-May-2008
Source: RYUJI INAI (2008-05-10). Processing-structure-property-relationship in electrospun polymer nanofibers. ScholarBank@NUS Repository.
Abstract: Due to its high surface area to volume ratio, electrospun nanofibers have many potential applications. However, no comprehensive studies to interpret how to control the nanofibers structure and properties. In this study, the effects of electrospinning parameters on the fiber morphology, molecular structure and tensile property were discussed. Based on the systematic parameter study, the parameters effects on the fiber morphology were summarized in the processing map. Nanofiber as small as 9nm was successfully produced. According to structure analysis, it was found that rigid and ductile polymers show different manner of structure formation via electrospinning. It noted that electrospun PLLA nanofibers were highly crystallized via post-processing. 91 % crystallinity was shown by amorphous nanofibers via annealing, and crystallized nanofibers at small hot-drawing ratio of 1.5. Single nanofibers tensile tests indicated that amorphous nanofibers show high performance (6.6 GPa in modulus, 230 MPa in strength and 0.26 in strain at break) via hot-drawing.
Appears in Collections:Ph.D Theses (Open)

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