V.M. STANKEVICH

Educational Establishment «Gomel Engineering Institute» of the Ministry for Emergency Situations of the Republic of Belarus, Gomel, Belarus

MODIFICATION OF POLYETHYLENE TEREPHTHALATE MODIFICATION OF POLYETHYLENE TEREPHTHALATE

TRACK MEMBRANES BY GAS PHASE DEPOSITION OF TRACK MEMBRANES BY GAS PHASE DEPOSITION OF

POLY-p-XYLYLENE POLY-p-XYLYLENE

E.M. TOLSTOPYATOV, V.P. SELKIN

P.Yu. APEL’

V.A. Belyi Metal-Polymer Research Institute of National Academy of Sciences of BelarusGomel, Belarus

Yu.M. PLESKACHEVSKY

Joint Institute for Nuclear Research, Flerov Laboratory of Nuclear ReactionsDubna, Moscow region

A.V.Lykov Institute of Heat and Mass Transfer of National Academy of Sciences of BelarusMinsk, Belarus

The aim of the work:

● poly-p-xylylene (PPX) coating deposition onto track membranes

by vacuum deposition polymerization

Experimental facility:

● polyethylene terephthalate (PETF) track membranes Object of the

investigation:

● accelerator of heavy ions U-400

● experimental set-up for PPX coating deposition

● scanning electron microscope

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SEM image of cross-section of track membrane covered with

PPX (PPX mass Мrel=1.62 relative units)

а

b

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SEM image of track membrane surface: (а) original; b – covered with PPX at Мrel = 0.9 r.u.;

c - covered with PPX at Мrel = 1.95 r.u.

а b c

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Мrel

r.u.

Толщина мембраны,

m

Диаметр пор, m Толщина покрытия, m

метод SEМгазодинамический

методметод SEМ

измеритель толщины

0 (orig.) 17,7 5,0 5,0 0 0

0,9 19,0 3,8 4,0 0,6 0,6

1,95 20,5 2,3 2,6 1,4 1,4

SEM image of track membrane surface with 100 nm pore diameter: а – original;

b – covered with PPX of ~ 40 nm thickness

а b2 m 2 m

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Conclusion

1) Effective and simple method is developed to form uniform polymer micro- and nano-patterns as well as method of modification of capillary-

porous structure of track membranes by means of poly-p-xylylene coating deposition

2) Maximal non-uniformity of PPX coating thickness on the micrometer size pore walls at routine deposition parameters was shown to be not

higher than 20 %

3) The possibility was shown to narrow the input / output parts of the pore channel without changing its middle part, thus producing a barrel-shaped capillary channel. This form is able to increase the selectivity of

the track membrane

66

The work was supported by

Belarusian Republican Foundation for Fundamental Research

(grant BRFFR – JINR Ф07Д–006)

and

State program of applied researches

“Polymer materials and technologies”

(part 2.14)

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