From: "Andreas Rutz" <phonon@deletethis.gmx.ch>
Newsgroups: sci.polymers,sci.physics.plasma
References: <c44et1$9nmf$1@saturn.cs.uml.edu>
Subject: Re: few questions about corona discharge
Date: Sun, 28 Mar 2004 03:38:29 +0200
Organization: Bluewin AG


i did some experiments on polymer modification using different techniques.

They all depend on chemical surface modifications. Corona treatment mainly
causes a oxidation of the surface groups, incorporating oxygen. The corona
disharge generates reactive radicals and ions from air. This treatment
increases polarity and enhances wettability for glueing.

For examination, XPS would be the best, as it is very surface sensitive and
shows differneces in chemical bonds. XRD is useless in this application,
it's used to examine crystallographic properties. IR spectroscopy is also
difficult, as it is not that surface sensitive, except under special
conditions (ATR). AFM can also give valuable results when used in lateral
force mode to show chemical changes at the surface, causing different
tip-sample interactions. Another easy experiment is the sessile drop test to
see the effects of surface modification.

for discharging, you could try a grounded carbon fiber brush, as it is used
to clean grammophone records.



"sebastien" <sebos1211@hotmail.com> schrieb im Newsbeitrag
news:c44et1$9nmf$1@saturn.cs.uml.edu...
>
> hello
>
> sorry my english is not very well!
>
> i make a training course on a loboratory working on thin film (GCM
> Polytechniques Montreal)
> i work on treatment by corona gas discharge on polymer layer
> (PC,PE,PMMA)
>
> i am looking for some information about:
>
> 1)what is doing on the polymer layer during the treatment?
>
> 2)there is structural modification?(it is like static electricity)
>
> 3)what is the best way to analyse the layer? (X-ray diffractometer,
> IR-spectroscopy, AFM, xps, ...)
>
> 4)how i can "clean" the layer from static charge?
> (i knwon i can use a ionizer but i already have a corona system and i
> don t want to buy a other device.)
> (someone told me about vapor but i find that strange)
>
> I'm looking forward to receive the information or web site link's.
> Thanks.
>
>
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>




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