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Why do most polymer blends exhibit lower critical solutions temperatures (LCST), rather than upper critical solution...

Why do most polymer blends exhibit lower critical solutions temperatures (LCST), rather than upper critical solution temperatures (UCST)?

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The phase behavior of polymer solutions is an important property involved in the development and design of most polymer-related processes. Partially miscible polymer solutions often exhibit two solubility boundaries, the upper critical solution temperature (UCST) and the lower critical solution temperature (LCST), which both depend on the molar mass and the pressure. At temperatures below LCST, the system is completely miscible in all proportions, whereas above LCST partial liquid miscibility occurs.

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