LCST and UCST behaviour of polymer blends
Polymer blends exhibit complicated phase behaviour resulting a.o. in the phenomenon of LCST and UCST. This behaviour has been explained on the basis of the recent thermodynamic theory by the introduction of an additional order parameter. For a miscible high molecular mass system the interactional parameter XAB has to be negative. Phase separation at elevated temperatures is connected with the contribution of free volume in the free energy of mixing.
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