what did you mean by "Symmetry solvents"? i think there is a problem in your translation, please chose more precise words.
I'm not quite sure the meaning of 'Symmetry solvents' - it may be you are looking for the types of different chemical solvents for polymer blends for freezing.
There are two types of solvents basically - it may be polar or non polar solvents. Polar solvents are usually better used with polymer blends due to its solubility in ionic medium.
They are structurally symmetrical i think.
solvent such as: Benzene, naphthalene, dioxane
The best solvent for freezin polymer blends - as was demonstrated in a great number of publications - is WATER. Due to H-bonds - water forms cyclic dimers which concentration is high enough - to call such a structures "symmetry Solvent"
Good Luck, Leonid
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