Experimental and Theoretical Investigations of Porous Structure Formation in Electrospun Fibers

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• 作者：Pratyush Dayal ; Jing Liu ; Satish Kumar ; Thein Kyu
• 刊名：Macromolecules
• 出版年：2007
• 出版时间：October 16, 2007
• 年：2007
• 卷：40
• 期：21
• 页码：7689 - 7694
• 全文大小：406K
• 年卷期：v.40,no.21(October 16, 2007)
• ISSN：1520-5835

文摘

The development of internal microstructure in electrospun fibers has been investigated bothexperimentally and theoretically. Various morphologies such as tubes, beads, and porous structures have beenobserved experimentally during electrospinning from amorphous polymer solutions such as poly(methylmethacrylate)/methylene chloride and poly(styrene)/tetrahydrofuran. The dynamics of electrospinning is modeledbased on multiple virtual strands of beads connected by Maxwell's elements in a cylindrical coordinate system.Concurrently, spatiotemporal growth of the porous structure is calculated in the framework of Cahn-Hilliardtime-evolution equation under the quasi steady state assumption coupled with the solvent evaporation rate equation.The coarse-grain simulation reveals the real-time formation of pores along the spinline of the electrospun fiberas the concentration traverses across the phase diagram of the amorphous polymer solution.