Re: 950k PMMA in dichloromethane?

"Manuel" <[EMAIL PROTECTED]> wrote in message
news:[EMAIL PROTECTED]
> Hi folks,
> I want to spin coat a substrate with 950k PMMA. My problem is that I
> can bake to no more than 100ºC and this is the reason I can't use the
> commercial PMMA diluted in chlorobenzene or anysol. I have found that
> dichloromethane is a good solvent for PMMA and with a low boiling
> point (40C).
> The question is if this solvent, the dichloromethane, will cut the
> chains of the PMMA giving a lower MW PMMA (unwanted) or if it will
> keep the original lenght of the PMMA?
>
> Thank you very much in advance.
>
> Manuscha


Dichloromethane will not cut the PMMA chain,  and even if there will be  a
small amount of HCl generated by the decomposition of dichloromethane, the
HCl will not cleave the PMMA chain.  But, will the HCl attack your substrate
or do other damage?

Regards,

Ernie