Surface modification of microporous polypropylene membranes by the grafting of poly(γ-stearyl- l-glutamate)

A polypeptide, poly(γ-stearyl- l-glutamate) (PSLG), was grafted on the surface of hydrophobic polypropylene hollow fiber membranes through the ring opening polymerization of N-carboxyanhydride (NCA) of γ-stearyl- l-glutamate initiated by amino groups which was generated by ammonia plasma. X-ray phot...

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Bibliographic Details
Published in:European polymer journal 2003-12, Vol.39 (12), p.2291-2299
Main Authors: Liu, Zhen-Mei, Xu, Zhi-Kang, Wang, Jian-Qin, Yang, Qian, Wu, Jian, Seta, Patrick
Format: Article
Language:English
Subjects:
Ammonia plasma
Applied sciences
Chemical Sciences
Exact sciences and technology
Exchange resins and membranes
Forms of application and semi-finished materials
Graft polymerization
N-carboxyanhydride of γ-stearyl- l-glutamate
Polymer industry, paints, wood
Polypropylene microporous membrane
Technology of polymers
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Summary:A polypeptide, poly(γ-stearyl- l-glutamate) (PSLG), was grafted on the surface of hydrophobic polypropylene hollow fiber membranes through the ring opening polymerization of N-carboxyanhydride (NCA) of γ-stearyl- l-glutamate initiated by amino groups which was generated by ammonia plasma. X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FT-IR), together with water contact angle and bovium serum albumin adsorption measurements were used to characterize the modified membrane surface. The XPS and FT-IR spectra demonstrated that polypeptide was actually grafted on the membrane surface despite of the low degree of graft polymerization due to the hydroxyl groups on the membrane surface. To subject the ammonia plasma-treated membrane with γ-(aminopropyl)triethanoxysilane (γ-APS) which can react with hydroxyl groups and leave amino groups, the degree of graft polymerization could be improved. The bovium serum albumin adsorption measurement was conducted to further examine the surface properties of modified and original membranes. Potential applications of the PSLG grafted membranes are expected for enantiomer separation and/or enzyme immobilization.
ISSN:0014-3057
1873-1945
DOI:10.1016/S0014-3057(03)00180-0