Can anyone think of a natural polymer that is ethanol soluble and water insoluble (hydrophobic)? 

 

If a natural polymer with these properties does not exist, what other options are there (excl. ethyl cellulose)?

14 hours ago, interlude said:

 

Can anyone think of a natural polymer that is ethanol soluble and water insoluble (hydrophobic)? 

 

If a natural polymer with these properties does not exist, what other options are there (excl. ethyl cellulose)?

I don't know if we have any polymer chemists here. I would think it quite hard to find a polymer with very different solubilities in water and ethanol since polarity and hydrogen bonding is so much a feature of both these solvents, though more for water obviously. I'm not surprised you are having difficulty identifying one.