What a plasticizer could you recommend as an additive to PolyEthylHydroSiloxane - which will provide a possibility to gently remove///dissolve the coating based on above mentioned PolyEthylHydroSiloxane from the metallic surface ?
Dear Leonid,
this is ab interesting question. Do you know if the surface reacts with the Si-H functionality? I expect a redox reaction (e.g. with the oxide) finally leading to Si-OH(R) species chemi- or physisorbed to the surface. The solubility of the polymer strongly depends on the molar mass, the polarity and so on and because it has to opportunity to crosslink the solubility will decrease. What do you think about dissolving the metal which may be interesting if you want to analyse the polymer after the reaction.
You should be able to monitor the reactive functionalities using spectroscopic methods. (in the publication RSi(OR)3)
Article Analysis of silanes and of siloxanes formation by Raman spectroscopy
Dear Michael:
Thank you for an interesting Article. Some (rather long) time ago I have studied almost a similar series of coupling agents and their reactions with various surfaces...
The subject I am now trying to understand - is closer to "industrial problem" than to lab.experiments. Namely: the stainless steel was coated by Poly(ethylhydrosiloxane) - to be a substrate in production of polyimides. The coating worked perfectly during 2.5 years... then suddenly - the cracks started to appear. The underlayer steel is superbly polished - that is why when removing by somehow the polymer overcoat - we have to avoid damaging the steel layer - so we have to remove the polymer very gingerly...
BUT after that (if successful) we will have to re-coat the steel again.
SO I am trying to find a way of how to avoid the cracks formation again.
I think that the best method is - by using a reasonably small amount of plasticizer.
Thus I'd very much appreciate any hints from your side - what kind of plasticizer will work well (?)
Thanks again for your prompt response, Leonid
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