I want to coat sulfobetaine methacrylate (SBMA) monomer on plastic substrate (ex. PET, PC) using plasma.
as little details, Substrate is treated by plasma at first, and dip in the solution of sulfobetaine methacrylate in water. then, substrate is treated by plasma again. so substrate coated with acrylic monomer by plasma induced radical polymerization.
in now my environment, I can use only O2 plasma. Is it okay?
As I check using FT-IR, I can't difference between unteated and coated substrate.
um.. Do i use other analysis?
little confused
Which power and duration did you use Oxygen plasma treatment on the surface of your plastic substrates?
The optimised power should be around 30 Watts for approximately 3 mins on your plastic substrates, which is enough to change the surface properties from hydrophobic to hydrophilic.
If you want to convert the monomer into polymer via plasma treatment then you need to standardise it varying the power and time. The hydrophobicity you can check using contact angle measurement only...
Oxygen plasm treatment indeed is an effective way to render the surface of substrate, while it does not give a surface with a high tendency without a trigger, e.g. heat, initiator, etc. You are going to treat your surface using oxygen plasma but at the same time you are inducing radical polymerization to your system. You might know that radical species strongly tend to react with oxygen and neutralize the entire system. Oxygen is considered as an impurity in a radical polymerization. So, you might need to go through each of steps once again to avoid unwonted reaction.
Hi,
1) Use concentrated solution for better effect;
2) If you use oxygen plasma for the second treatment, there is a danger that you will erase the the grafted groups. Compare with N2 if available. UV is also an option here.
Article Effect of glow discharge plasma on step-index polymer optica...
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