A series of ABC ?-conjugated rod�coil�coil triblock copolymers of PPV-PVP-PS were synthesized by end-coupling reaction between aldehyde-terminated PPV of a fixed contour length with different molecular weight living anions Figure 1. <img src='https://acs-archive-assets2.s3.amazonaws.com/240nm/uploads/34822_cd_surfacechargeacs.jpg' alt='' />and their self-assembly behaviors were explored. Three different triblock copolymers of PPV-PVP-PS1, PPV-PVP-PS2, and PPV-PVP-PS3, each with PPV, PS, and PVP, respectively , as the major species in the copolymers were used to study the effects of copolymer composition and rod�rod interaction between PPV blocks on their morphology. TEM, POM, and SAXS and WAXS experiments as a function of different annealing conditions revealed the details of the copolymer morphology, molecular packing, and their phase transitions. Simultaneous SAXS and WAXS measurements show that all three triblock copolymers undergo the ordered lamella-to-disorder transition and the smectic/isotropic transition at the same temperature, indicating that the rod�rod interaction between PPV rods plays a critical role in forming these lamellar structures.

Anionic synthesis, self-assembly behavior of ABC [prod]-conjugated rod-coil-coil triblock copolymers

243rd National Meeting (2012)

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