making polyurethane membranes

[floosh]

I'm trying to make small 3.5 radii membranes from polyurethane pellets dissolved in THF(10%polymer solution). I'm casting them in aluminum pans and tried both air-drying in a hood and vacuum drying, but when I try to peel the membranes off...they cohere to themselves and won't unstick...kinda like when tape tapes itself. Any ideas?

 

[etaber]

I personally do not know, but I will forward this message to another Eng in my group, who will know what to do. I know they have been doing some work similar to your project over the last few months. I hope he can help.

Eric

 

[keepuh]

What type of polyurethane pellets are you trying to do this with?

 

[mohtogh]

Hi, what is its application (PU membrane) ?

 

[aspearin1]

Try teflon coated or glass substrate. Be sure all THF is rinsed away before attempting to dry. May want to cast an a surface other than that which you dry it on. Watch for shrinkage!

 

[corben123]

I was looking at some of your entries and would like to talk to you off-line,I work R&D for a ptfe membrane manufacturer. please call