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Hydrophilic Surface Modification of Microporous Polymer Membranes Using A Variety of Low-Temperature Plasma Treatments

Published online by Cambridge University Press:  11 February 2011

Dattatray S. Wavhal ,
Kristen R. Kull ,
Michelle L. Steen  and
Ellen R. Fisher
Dattatray S. Wavhal
Affiliation:
Department of Chemistry, Colorado State University, Fort Collins, CO 80523–1872
Kristen R. Kull
Affiliation:
Department of Chemistry, Colorado State University, Fort Collins, CO 80523–1872
Michelle L. Steen
Affiliation:
Department of Chemistry, Colorado State University, Fort Collins, CO 80523–1872
Ellen R. Fisher
Affiliation:
Department of Chemistry, Colorado State University, Fort Collins, CO 80523–1872
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Abstract

A variety of plasma treatments have been employed to achieve permanent hydrophilic surfaces throughout the membrane structure. Specifically, we have modified microporous polyethersulfone (PES) membranes using H2O, CO2, and N2 plasma treatments to implant polar functional groups; alternatively, Ar-plasma treatment followed by grafting of hydrophilic monomers (acrylic acid and acrylamide) in the vapor phase has also been successful at modifying PES membranes. PES membranes treated with H2O and CO2 plasmas as well as the grafted membranes are found to be permanently hydrophilic (for a minimum of six months), and the entire membrane cross-section is modified. Chemical changes to the modified PES membranes were determined with FTIR and XPS measurements. Furthermore, water bubble point measurements and electron microscopy results reveal that pore sizes of the modified membranes are only slightly affected, depending on the treatment. Incorporation of polar functionalities results in an increase in the glass transition temperature (Tg) and a moderate change in tensile strength of the modified membranes. Most importantly, the surfaces of the modified membrane are less susceptible to absorption by bovine serum albumin (BSA) proteins.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 752: Symposium AA – Membranes–Preparation, Properties and Applications , 2002 , AA3.1
Copyright
Copyright © Materials Research Society 2003

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References

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