Precipitation of Nylon 6 membranes using compressed carbon dioxide

Yeh Wei Kho; Douglass S. Kalika; Barbara L. Knutson

doi:10.1016/S0032-3861(01)00067-2

Precipitation of Nylon 6 membranes using compressed carbon dioxide

Yeh Wei Kho, Douglass S. Kalika, Barbara L. Knutson

Research output: Contribution to journal › Article › peer-review

56 Scopus citations

Abstract

Membrane formation using a compressed antisolvent is analogous to conventional immersion precipitation using liquid nonsolvents and introduces pressure as an additional variable for tailoring the membrane microstructure. Thin films of a semicrystalline polyamide, Nylon 6, were precipitated from 2,2,2-trifluoroethanol by exposing the incipient membrane to compressed CO₂ antisolvent at 35°C and variable pressures up to 173.4 bar. Membrane structures dominated by liquid-liquid (L-L) and solid-liquid (S-L) demixing processes were observed as a function of precipitation conditions. Interpretation of the resulting membrane morphologies was based on structural features observed for traditional phase inversion processes and reflected the relative rates of L-L and S-L demixing as a function of the pressure-dependent strengths of the solvent and antisolvent. The ability to tailor the morphology of a semicrystalline membrane using compressed antisolvent suggests an alternative to current CO₂-based polymer impregnation techniques, which require solute solubility in CO₂, for the generation of composite thin films and membranes.

Original language	English
Pages (from-to)	6119-6127
Number of pages	9
Journal	Polymer
Volume	42
Issue number	14
DOIs	https://doi.org/10.1016/S0032-3861(01)00067-2
State	Published - Apr 20 2001

Bibliographical note

Funding Information:
The authors would like to acknowledge the Petroleum Research Fund (PRF) for the funding of this research (32513-G9). A special note of thanks is extended to Larry Rice for his help and guidance in preparing the SEM micrographs. The assistance of Jeff Hoffman, Kevin McKinney and Timothy Chaffins in carrying out part of the experimental work, with funding from National Science Foundation REU program (DMR-9732302) is also duly noted.

Funding

The authors would like to acknowledge the Petroleum Research Fund (PRF) for the funding of this research (32513-G9). A special note of thanks is extended to Larry Rice for his help and guidance in preparing the SEM micrographs. The assistance of Jeff Hoffman, Kevin McKinney and Timothy Chaffins in carrying out part of the experimental work, with funding from National Science Foundation REU program (DMR-9732302) is also duly noted.

Funders	Funder number
National Science Foundation (NSF)	DMR-9732302
American Chemical Society Petroleum Research Fund	32513-G9

Keywords

Compressed CO
Membrane formation
Nylon 6

ASJC Scopus subject areas

Organic Chemistry
Polymers and Plastics
Materials Chemistry

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10.1016/S0032-3861(01)00067-2

Cite this

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title = "Precipitation of Nylon 6 membranes using compressed carbon dioxide",

abstract = "Membrane formation using a compressed antisolvent is analogous to conventional immersion precipitation using liquid nonsolvents and introduces pressure as an additional variable for tailoring the membrane microstructure. Thin films of a semicrystalline polyamide, Nylon 6, were precipitated from 2,2,2-trifluoroethanol by exposing the incipient membrane to compressed CO2 antisolvent at 35°C and variable pressures up to 173.4 bar. Membrane structures dominated by liquid-liquid (L-L) and solid-liquid (S-L) demixing processes were observed as a function of precipitation conditions. Interpretation of the resulting membrane morphologies was based on structural features observed for traditional phase inversion processes and reflected the relative rates of L-L and S-L demixing as a function of the pressure-dependent strengths of the solvent and antisolvent. The ability to tailor the morphology of a semicrystalline membrane using compressed antisolvent suggests an alternative to current CO2-based polymer impregnation techniques, which require solute solubility in CO2, for the generation of composite thin films and membranes.",

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note = "Funding Information: The authors would like to acknowledge the Petroleum Research Fund (PRF) for the funding of this research (32513-G9). A special note of thanks is extended to Larry Rice for his help and guidance in preparing the SEM micrographs. The assistance of Jeff Hoffman, Kevin McKinney and Timothy Chaffins in carrying out part of the experimental work, with funding from National Science Foundation REU program (DMR-9732302) is also duly noted.",

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AU - Kalika, Douglass S.

AU - Knutson, Barbara L.

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PY - 2001/4/20

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N2 - Membrane formation using a compressed antisolvent is analogous to conventional immersion precipitation using liquid nonsolvents and introduces pressure as an additional variable for tailoring the membrane microstructure. Thin films of a semicrystalline polyamide, Nylon 6, were precipitated from 2,2,2-trifluoroethanol by exposing the incipient membrane to compressed CO2 antisolvent at 35°C and variable pressures up to 173.4 bar. Membrane structures dominated by liquid-liquid (L-L) and solid-liquid (S-L) demixing processes were observed as a function of precipitation conditions. Interpretation of the resulting membrane morphologies was based on structural features observed for traditional phase inversion processes and reflected the relative rates of L-L and S-L demixing as a function of the pressure-dependent strengths of the solvent and antisolvent. The ability to tailor the morphology of a semicrystalline membrane using compressed antisolvent suggests an alternative to current CO2-based polymer impregnation techniques, which require solute solubility in CO2, for the generation of composite thin films and membranes.

AB - Membrane formation using a compressed antisolvent is analogous to conventional immersion precipitation using liquid nonsolvents and introduces pressure as an additional variable for tailoring the membrane microstructure. Thin films of a semicrystalline polyamide, Nylon 6, were precipitated from 2,2,2-trifluoroethanol by exposing the incipient membrane to compressed CO2 antisolvent at 35°C and variable pressures up to 173.4 bar. Membrane structures dominated by liquid-liquid (L-L) and solid-liquid (S-L) demixing processes were observed as a function of precipitation conditions. Interpretation of the resulting membrane morphologies was based on structural features observed for traditional phase inversion processes and reflected the relative rates of L-L and S-L demixing as a function of the pressure-dependent strengths of the solvent and antisolvent. The ability to tailor the morphology of a semicrystalline membrane using compressed antisolvent suggests an alternative to current CO2-based polymer impregnation techniques, which require solute solubility in CO2, for the generation of composite thin films and membranes.

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Precipitation of Nylon 6 membranes using compressed carbon dioxide

Abstract

Bibliographical note

Funding

Keywords

ASJC Scopus subject areas

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