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A STUDY ON THE CHANGE OF TRANSPORT AND SELECTIVE PROPERTIES OF ULTRAFILTRATION POLYMER MEMBRANES AFTER VACUUM METALLIZATION WITH IRON-CHROMIUM-NICKEL ALLOY

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Author(s): Violeta Ognianova Slavova | Stoiko Petrov Petrov | Georgios Priniotakis

Journal: Annals of the University of Oradea. Fascicle of Textiles, Leatherwork
ISSN 1843-813X

Volume: XIV;
Issue: 2;
Start page: 137;
Date: 2013;
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Keywords: polymer membranes | modification | vacuum metallization | coating.

ABSTRACT
The possibility for vacuum metallization of ultrafiltration polymer membranes with iron-chromium-nickel alloy was studied after preliminary modification with Sn2+ in acid medium. The change of transport and selective characteristics of the vacuum metal coated membranes was studied, as well as the durability of the vacuum obtained coating during membrane performance. Two types of polyacrylonitrile membranes with differing characteristics and structure were studied to find the effect of exposition on the vacuum metallization, the possibilities for preliminary chemical modification of membrane surface. The metal coating was prepared in vacuum installation BUP-5 by sputtering flat target of iron-chromium-nickel alloy (H18N9T) with size ø 100 х100 mm, at distance target/membrane and specific sputtering power . A comparison of the efficiencies of the initial non-treated and non-metalized membrane (87 l/m2h) and chemically modified non-metalized one (93 l/m2h) with the efficiency of a membrane coated with X18H9T, it can be seen that the latter had lower efficiencies for water regardless of the sputtering time. The second type of membranes used for the present studies (PAN-II) have much higher water efficiency compared to the PAN-I membranes, measured as initial structures. The higher efficiency leads to lower selectivity of these membranes (compared to PAN-I), as determined by the experimental data. It was interesting to find how this higher efficiency would be affected by the vacuum metallization. With the increase of coating time from 5 to 25 s, their efficiency increased from 380 to 505 l/m2h (Fig.5). The value of the efficiency at exposition time of 25 s (185 l/m2h ) was close to these of chemically non-treated and non-metalized one (87 l/m2h) and chemically treated non-metalized one (350 l/m2h) membranes.
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