Bubbles in a polymer film

[bushytoptree]

I am looking for a method of incorporating microbubbles of diameter 2 to 10 micron in a 10 to 15 micron polymer film (probably PDMS). The film will be spin coated onto various substrates and I need the bubbles to remain distributed evenly throughout the film after curing.

Thanks in advance.

BTT

 

[Demon3]

Try these expandable microspheres. There are different grades depending on what size you need and what temperature you want them to expand at. This could be a nice method of creating your bubbles.

http://www.expancel.com

"The dramatic expansion when heated and the other unique properties of EXPANCEL® microspheres are due to a small amount of a hydrocarbon encapsulated by a gastight thermoplastic shell. When the microspheres are heated the thermoplastic shell softens and the hydrocarbon inside the shell increases its pressure. This results in a dramatic expansion of the spheres (typical diameter values: from 10 to 40 µm), with a corresponding dramatic decrease of the density (typical values: from 1000 to 30 g/liter).
The different EXPANCEL® microsphere grades vary according to:
expansion factor
heat resistance
particle size
chemical and solvent resistance."

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