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Research Papers

Investigation of Inner Surface Groove Formation Under Radially Inward Pressure During Immersion Precipitation-Based Hollow Fiber Membrane Fabrication

[+] Author and Article Information
Jun Yin, Nicole Coutris

Department of Mechanical Engineering,  Clemson University, Clemson, SC 29634

Yong Huang1

Department of Mechanical Engineering,  Clemson University, Clemson, SC 29634yongh@clemson.edu

1

Corresponding author.

J. Manuf. Sci. Eng 133(3), 031003 (Jun 08, 2011) (8 pages) doi:10.1115/1.4003950 History: Received April 03, 2010; Revised March 19, 2011; Published June 08, 2011; Online June 08, 2011

Axially aligned grooves can be formed on the hollow fiber membrane (HFM) inner surface under some controlled fabrication conditions during a typical immersion precipitation-based phase inversion fabrication process. Such grooved HFMs are finding promising medical applications for nerve repair and regeneration. For better nerve regeneration performance, the HFM groove geometry should be carefully controlled. Towards this goal, in this study the polyacrylonitrile (PAN) HFM groove number has been modeled based on the radially inward pressure-induced buckling mechanism. HFM has been modeled as a long six-layer fiber membrane, and the HFM inner skin layer has been treated as a thin-walled elastic cylindrical shell under the shrinkage-induced inward radial pressure. The groove number has been reasonably estimated based on the resulting buckling mode as compared with the experimental measurements.

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Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 1

(a) Schematic drawing of spinneret and hollow fiber spinning process (S: solvent and NS: nonsolvent) and (b) illustration of a six-layer PAN HFM structure

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Figure 2

HFM with (a) irregular and (b) grooved [7] inner surface

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Figure 3

Flowchart of a typical immersion precipitation-based phase inversion process

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Figure 7

Predicted and measured groove numbers on the HFM inner surface as the functions of (a) the polymer solution flow rate, (b) the inner nonsolvent flow rate, and (c) the polymer concentration

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Figure 6

Groove number prediction flowchart

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Figure 5

Schematic of the six-layer model before and after the shrinkage-induced inward pressure

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Figure 4

Representative PAN HFM with an aligned groove texture on the inner surface

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