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1
1
0
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.
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f
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r
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A
A
c
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d
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g
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P
P
l
l
a
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m
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c
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10.10.4.2 Coating of plastics via plasma polymerization
Plastics are mostly easy to coat via plasma polymerization. So e.g. can CD’s and DVD’s be coated
with an anti-scratch coating without a reduction of their quality.
PTFE-like coatings can be created to enhance the slippage of the sample parts / products.
It is also possible to create functional groups on the surface (e.g. amino groups for bio analytic
applications).
Original surface scratch test (untreated) scratch test (treated)
Group Material
Gas
Pressure
[mbar]
Power [%]
Time
[min.]
plastic HMDSO+O
2
0,1-0,5
50-100 1-60
plastic
plastic C
4
F
8
0,1-0,5
50-100
1-60
(The process parameters power and time have to be adapted according to the specification of the machine (type
of generator, power of generator, type of electrode) and according to the properties of the product/sample.)
The polymerization can also happen in several steps.
f.e.:
1. activation:
5 minutes O
2
2. coating:
5 minutes HMDSO
3.
’etching’:
12
seconds
O
2
4. coating:
5 minutes HMDSO
5.
’etching’:
12
seconds
O
2
6. coating:
5 minutes HMDSO
Afterwards you may harden the surface by some seconds of oxygen plasma. By this step the coating
will be hydrophilic.
Summary of Contents for femto
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