I am running polycondensations with triphosgene and diols and have noticed degradation of the final powder that is much faster than normal. Anhydride bonds are obviously not as thermally stable as carbonate bonds, and it seems as though the chloroformates that triphosgene makes could make an anhydride bond in the polymer backbone. Anyone have any insight?
Morton,
First off thankx for the great insight. I had no idea that you could heat dry polymer solution in a non-protic solvent and decompose anhydrides to carbonates, very interesting. Do you happen to have a publication where thats referenced or studied? That would be a huge help.
We do our triphosgene addition over three hours and let it stir overnight, but interestingly enough we have to add at least a molar excess of 1.15-1.30 to our reactions to drive them to higher molecular weights
Im not sure theres a better way of running the reaction but Im definitely open to ideas! Thankx!
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