Isn't this something that was covered in school? Immiscible means that the materials in question do not like to be homogeously blended; oil and water are the poster child example of that. Presumably, one could have three liquids that are mutual immiscible, but likewise, water alcohol, and ethylene glycol would be an example of three miscible liquids.
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There is a homework forum hosted by engineering.com:
A mixture of two polymers is almost always immiscible
A mixture of three polymers will almost always be immiscible
Solvents (small molecules) are usually miscible because mixing causes disorder (high entropy) which is favorable. So, although water and acetone have very different polarities, they still mix.
Polymers (large molecules) do not gain much entropy by mixing so they usually do not mix on a molecular level.
I have a slide on this in some of my training webinars.
Chris DeArmitt PhD
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