I am looking for polymer which can be coated on glass surface and can produce highly adhasive thin layer on the surface and should be pass UV light through it.
BUTVAR!! It is used to laminate safety glass worldwide and is soluble in many common solvents. Excellent adhesive
Yes, PDMS should be UV-transparent, which is widely used in photo-lithography.
what about the adharence of PDMS on glass substrate? can I get the film by dip coating?
Dip coating should work. If you want to get some uniform coating, you can use spin coating. The adhesive force should be enough strong for common use.
Dear Dr. Zhou,
Thanks for your suggestions, I will try to use this for my future work.
About adhesion of PDMS on glass, a good answer to your question would require some more detail on the thickness of the film you want to have and wat do you need to do with the glass/PDMS device afteward. By the way, provided that the surface has been very well cleaned (i.e. remouving of all organic contaminants) and activated by some piranha or oxygen plasma cleaning, if you spin coat PDMS and then thermally cure, it should stay very well attached to the substrate.
A formullation for silicon coating: 1) UV-curable PDMS dimethacrylate 2) Adhesion promotor for example: Trimethoxysilylpropyl methacrylate or Vinyltrimethoxysilane 3) Irgacure 184 or 1173
Dear Zhau, Grenic, Najafi,
is there paper is available on the coating of PDMS or any other polymer on coating ?
Can you please provide me?
Thanks
BUTVAR!! It is used to laminate safety glass worldwide and is soluble in many common solvents. Excellent adhesive
PC should be, if I well remember its structure and UV-Vis spectrum...
Dear Allan. Silva, Banhegyi thanks for your kind suggestions.
Dear Rajesh, i know of a paper where PDMS was spin-coated onto Silicon but not glass. I can pass you the paper. Please e-mail me at [email protected].
Acrylic resins are also UV-transparent. You can find several resins for this purpose at "specialchem4coatings"
But what sort of coating mechanism are you thinking of? Waterbased or solvent-based or perhaps UV-curing as Farhood Najafi proposed? The use of an amino-silane or a epoxy-silane will improve the adhesion on glass.
Just a though...
Have you ever thought of silanes?
Some can and are acting as a binder.
No better adhesion since the active silane function create a covalent bond with the silicum atoms of the glass.
One thing though... Once the silane is on the surface, don't dream about recycling the glass bottle, hum?
But anyhow, there are well chosen silanes that can act as an adhesion promoter only instead of a binder. The binder thus can be an epoxy or other functional pre-polymer of one's interest according the binder price.
There are so many options as you can imagine!
Price is always a concern when formulating.
Worst! In now days, we have to watch if the final product is "Green"!
Just a thought...
Pierre.
Glass is not transparent to part of the UV spectrum. Pyrex glass blocks most of the ligth below 315 nm or so.
Aliphatic polymers in general pass UV very efficiently. Aromatic polymers tend to absorb UV and yellow. Butvar is both aliphatic and a great adhesive. Other than that, perhaps a siloxane polymer would be worth testing.
AND.... polyvinylidene fluoride (trade name KYNAR) should be excellent also. It has a higher melting point which might be an issue.
In general any perfluopolymer is very transparent in any UV regions, understanding that "transparent" is a molecular phase where the atomic bonds have less absorbance effects. In such a case there are many opportunities for example any polymer of the following commercial perfluoro monomers: 1H,1H,2H,2H-Perfluorodecyl methacrylate; 1H,1H,2H,2H-Nonafluorohexyl-1-methacrylate; 1H,1H,2H,2H-Tridecafluorooctyl-1-methacrylate; 1H,1H,2H,2H-Tridecafluorooctyl acrylate; 2-Perfluorobutylethyl acrylate and 2,2,3,4,4,4-Hexafluorobutyl methacrylate; with a copolymer where any of these perfluoromonomers participates in your formulations toghether with an acrylic monomer to achieve good price could serve for your proposes. Hint: try not to use crosslinking agents for better results. Regards.
I have not read all previous answers, but Armando is spot on here -- look for perfluoro polymers for optical transparency within the UV region.
Where will i get PDMS sheets having thickness 100 microns or thicker ? I want to cast micro image on it. Can anyone advice, thanks.
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