Hi Virginie Dujols:
By chance as looking in MEMSNet and saw you query:
1. Your is question one of degree; how many R-COOH's do you need/want
1.1 Plasma (vacuum) processes: might try 100% O2 plasma at 0.5-2.0 Torr if this
equip is available.
Plama treats might give a low decoration density on surface but they will cause
a huge increase in surface tension (energy)
because they place O-containing groups on surface.
1.1.1 by chance as I read your query I was reading online: "PLASMA SURFACE
MODIFICATION OF
POLYMERS USING ATMOSPHERIC PRESSURE DISCHARGES*"
[ftp://uigelz.ece.uiuc.edu/pub/presentations/rajesh_icops02.pdf]
by Rajesh Dorai 1[e-mail: [email protected]] and Mark J. Kushner[[email protected]]
2;University of Illinois;1
Department of Chemical Engineering;2 Department of Electrical and Computer
Engineering
Urbana, IL 61801;[main kushner page is http://uigelz.ece.uiuc.edu] " An air-
corona-processed PP film contains hydrophilic functional groups such as:
Aldehydes (-CHO) ? Ketones (-C=O); Alcohols (-C-OH) ? Hydroperoxides (-COOH)"
2. UV/Ozone treatment: here things as simple as swimming pool ozonators,
suitably jury-rigged
(or as fancy as UV-Ozone chambers)can be used with air to add alcohols,
aldehydes/ketones
and acids to polymer surfaces. A receipt might be posted on web, dunno.
3. Another thing done on enormous scale in industry to PP films and fibers is
literally a flame treatment as fiber or web
goes hurtling past a fixed bank of nozzles. For MEMS you might only need a
sheet, so unless Tekra below
can give you sample, a thing to try might be to befriend a local welder with an
oxy-acetylene torch:
3.1 Try rapidly moving a full blue cutting (oxidizing) flame across
surface until just before
burning, melting; you might "burn' a few samples but onc distance and speed of
moving flame are gotten
this method is amazingly reproduceable
- Look at water drops on virgin vvs "flamed" PP to see how well H2O
spreads after treating
-- Once drop flattens out surface tension says -OH (and maybe
COOH)
are on surface
4. There might be full chemical ways as well: something like nitric
acid/sulfuric acid mixtures (hot) where you dunk pieces
of PP in for short periods, remove and quench in cold DI water. THis might add
a few COOH's before
full destruction.
4. 1. Also From past dimmed by 30 years, I seem to recall (on my
disastorous forays) into organic synthesis
that reacting bromoacetic acid (or its anhydride) with alcohols would give
additions; you likely know
better than I, but if groups put on by any thing mentioned here leave only R-OH,
seems like standard
syn ways could add acids. N-Bromosuccinimide (NBS) is also in dim storage.
4.1 Reacting things like a dianhydride with the alcohol decorated surface
might give an PP-ester-free acid
decoration
5. Lastly, Xylenes (and other aromatics) swell certain MolWeight ranges of
Polyethylenes and polypros. Maybe heating
a film or massive object in Xy; Ingress (for tangling) a long chain mono-acid
(CH3)-(CH2)x-COOH (x = 10-20 or
long branched chains better since would tangle better); Then quench is hot water
to allow -COOH to migrate to surface (Donan effect);
dunno how well stuck this would be, but is x is large the PP wants to hang onto
the tail, anb the air water world wants
to drag out the acid, so it might just stay on surface.
2. Commericial PP and polyesters are often treated with strong, atmosphereic
(78%N2/19%O2)
corona discharges so that their inert, low surface energy is raised for ink
wetting, paint adhesion etc.
Tekra (in US) is one such; lead is below; my pal was laid off so I no longer
know a tech expert.
* Tekra; 16700 West Lincoln Avenue,New Berlin,WI 53151 [262-797-3269 old
phone of friend now laid off.but someone
ought to answer]Tekra sells many different types of polyethylenes and
polypropylenes, polyesters, polycarbonates, etc.
; you need to ask for a type that has been corona or plasma treated so that it
can be used for laminating food packaging films; some of
these PP films already have adhesives coated on so you need to be sure you ask
right questions about plasma or corona or flame treated PP.
someone there should be able to help.
Hope this helps:
Bill Estes,DuPont Display Technologies
[email protected]
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