From: sebos1211@hotmail.com (sebastien)
Newsgroups: sci.polymers,sci.physics.plasma
Subject: sessile drop test on corona treated surface
Date: 16 Apr 2004 13:43:22 -0700
Organization: http://groups.google.com


Hello,

I study effects of corona treatment on polymer surface.

I have made a interresting test: i had treated an BCB sample whit a
afm grid (in order to have a treated and a untreated aera) and i have
analysed this sample wiht AFM (view image :
http://urubis.free.fr/fotos%20_seb/AFM_bcb-grid-07042004/ )
If you look to picture (
http://urubis.free.fr/fotos%20_seb/AFM_bcb-grid-07042004/Ysbs2f.tif )
you can see friction is lower where the polymer is treated than where
is untreated! Normally because tip interaction it will be the
opposite! I don t really know why but i think hydroxide or other
oxygen or hydrogen group neutralize polarity effects .

I have read many publication about increase of ink adhesion and
wettability on polymer surface .After reading I ve got the same
question: This effects are they due to moleculare surface
modification (incorpration of oxygen and creation of hydrogen bonding)
or by the increase of the polarity?

I realize sessile drop test on polycarbonate surface whit deionize
water in order to have more information.
For different time (1 to 10 mim) and voltage (0 to -8kV) parameters
for corona treatment I ve got the same angle (76deg)!!!
I don t understant what happen:

1-there is a reaction between H2O and the oxidated surface group
created during the treatment?


2-May be i have to used a other liquid, but I don t know which are
usually used with polymer.



If anyone can help me it will be very nice.

And if you want to correct grammar it is ok ! no it s a joke .
sorry for my english!!!

SEBASTIEN