UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS

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Conference: Bucharest University Faculty of Physics 2003 Meeting


Section: Optics, Spectroscopy, Plasma and Lasers


Title:
Plasma modification of porous polymeric materials


Authors:
A. Lazea, S. Vizireanu, C. Petcu, D. Crintea, B. Mitu, G. Dinescu B. Albu*, V. Parvulescu*


Affiliation:
National Institute for Laser, Plasma and Radiation Physics,

Low Temperature Plasma Physics Department, PO BOX MG 36 Magurele Bucharest, 76900 Romania; *e-mail: dinescug@alpha.infim.ro

* Research Center for Macromolecular Materials and Membranes, Spl. Independentei 202B, sector 6, CP 15-143, Bucharest, e-mail macromol@rnc.ro


E-mail


Keywords:


Abstract:
It was previously established that during the interaction of plasma with polymer surfaces both etching and deposition processes take place. Even in the case of use of non-polymerizable gases use the etched polymer can repolymerize onto the surface. The dominance of one of the process depends on plasma conditions and gas composition. Particularly, these processes are important for modification of porous materials, like the asymmetric membranes. The plasma treatment of porous polymeric membranes is an effective method for modifying the pore size diameter and shape, depending on the plasma conditions and material properties. By surface activation of the membranes the hydrophobic character can be changed to a hydrophilic character; by plasma polymerization of a monomer introduced in the discharge an active layer can be grown on the surface, and also a polymerization reaction may occur by monomer grafting on the surface subsequent the plasma activation. In this work the modification of the pore size diameter and shape of asymmetric polysulphone membranes induced by RF plasma treatments are presented and discussed. The pore size diameter desired for filtration is depending on the preparation conditions and can be in the range 20 - 2000 nm. The treatments have been performed in a parallel plate reactor cell, at RF power in the range 10 - 100 W, for a treatment time between 30 - 600 s. The modifications have been monitored by AFM, FTIR, and liquid porometry. The plasma processes responsible for surface and membrane properties modification are discussed.