Correlations of Solution Rheology with Electrospun Fiber Formation of Linear and Branched Polyesters

Matthew G. McKee, Garth L. Wilkes, Ralph H. Colby, Timothy Edward Long*

*この研究の対応する著者

研究成果: Article査読

546 被引用数 (Scopus)

抄録

The implications of the entanglement concentration (C e) on the electrospinning process for a series of linear and branched poly(ethylene terephthalate-co-ethylene isophthalate) (PET-co-PEI) copolymers with weight-average molecular weights (M w) ranging from 11 700 to 106 000 g/mol and branching index values (g′) from 1.0 to 0.43 were investigated. Analyzing the dependence of specific viscosity (η sp) on concentration enabled the determination of the semidilute unentangled, semidilute entangled, and concentrated regimes for the PET-co-PEI solutions. Linear and branched copolymers were electrospun from semidilute unentangled, semidilute entangled, and concentrated solutions under identical conditions to determine the effects of concentration regime and molecular topology on electrospun fiber morphology. The dependence of the fiber diameter and morphology on the zero shear rate viscosity (η 0) and normalized concentration (C/C e) was determined. For copolyesters with molecular weights well above the entanglement molecular weight, C e was the minimum concentration required for electrospinning of beaded fibers, while 2-2. 5 times C e was the minimum concentration required for electrospinning of uniform, bead-free fibers. When the concentration was normalized with C e, the influence of chain length and topology on the electrospinning process was removed, and the fiber diameter universally scaled with the normalized concentration to the 2.6 power.

本文言語English
ページ(範囲)1760-1767
ページ数8
ジャーナルMacromolecules
37
5
DOI
出版ステータスPublished - 2004 3月 9
外部発表はい

ASJC Scopus subject areas

  • 材料化学

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