Summary
Based on the description of AB-block copolymers as micellar structures given by Semenov, the phase diagram of AB-diblock copolymers is calculated taking the homogeneously mixed system as a reference state. The predicted value (χN)c = 10.385 for a symmetric AB-diblock copolymer compares very well to the result of the original Random Phase Approximation theory (10.495). The simplicity of the model allows its extension to predict order-order transitions in ABC-triblock copolymers.
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Abetz, V., Stadler, R. & Leibler, L. Order-disorder-and order-order-transitions in AB and ABC block copolymers: description by a simple model. Polymer Bulletin 37, 135–142 (1996). https://doi.org/10.1007/BF00313829
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DOI: https://doi.org/10.1007/BF00313829