Microphase-separated block copolymers behavior

Oscillatory Shear Rheometry of Microphase-Separated Block Copolymers Exhibiting Upper Critical Order—Disorder Transition Behavior... 

Phase Behavior and Phase Transitions in AB- and ABA-type Microphase-Separated Block Copolymers... 

In this chapter, we first reviewed the currently held mean-field theories predicting the phase behavior and phase transitions in AB- and ABA-type microphase-separated block copolymers. As a supplement to this discussion, in the Appendix we have provided detailed derivations of some of the very complicated mathematical expressions from these theories, which we hope will be helpful in providing a better understanding the origins of such complicated expressions. 

Riess [60] gave a first description of the phase behavior of linear ternary triblocks. While in microphase separated diblock copolymers only one structural feature ean exist like lamella, cylinder, or sphere, ternary block copolymers can simultaneously exhibit different features in the microphase separated state (e.g., spheres within a cylinder or lamella, etc.). 

Block (Star) Arrangement. The known star polymers, like their linear counterparts, exhibit microphase separation. In general, they exhibit higher viscosities in the melt than their analogous linear materials. Their rheological behavior is reminiscent of network materials rather than linear block copolymers (58). Although they have been used as compatibiUzers in polymer blends, they are not as effective at property enhancements as linear diblocks... 

LeiblerL., Theory of microphase separation in block copolymers. Macromolecules, 13, 1602, 1980. Eoerster S., Khandpur A.K., Zhao J., Bates E.S., Hamley I.W., Ryan A.J., and Bras W. Complex phase behavior of polyisoprene-polystyrene diblock copolymers near the order-disorder transition. Macromolecules, 21, 6922, 1994. 

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