Case IV Circular Phase Envelope LCST and UCST

2 Case IV Circular Phase Envelope LCST and UCST 

The free energy change happens by blending two polymers 1 and 2, where polymer 1 is a copolymer with monomers A and B as repeat units, and polymer 2 is a homopolymer of monomer repeat nnit C, which can be written as follows  

FIGURE 5.4 Phase diagram T versus cpi)-circular phase boundary with UCST convex downward and LCST concave upward. 

The enthalpic contribution can be obtained from the binary interaction model as explained in Chapter 3. This is restated as follows for the considered blend of polymers 1 and 2. 

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