Abstract
Azobenzene-containing linear–dendritic block copolymers (LDBC) with varied generation numbers were synthesized recently. This photosensitive LDBC consists of a linear solvophilic block (R) and solvophilic dendrons of which the periphery is attached with a solvophobic coil–rod diblock (B–Y). The self-assembly and its photoresponsive transformation are explored by dissipative particle dynamics. Dependent on the generation number, polymer concentration, block lengths, and π–π interaction between rod blocks, the aggregate exhibits a rich variety of morphological conformations, including spherical micelle, worm-like micelle, cylindrical micelle, hamburger-like micelle, nanosheet, nanobowl, and vesicle. In general, polymersomes take shape for LDBCs with large generation number while nanofibers and nanosheets develop for LDBCs with small generation number. Upon UV illumination, the photoinduced trans-to-cis isomerization of azobenzene takes place and the membrane becomes distorted, wrinkled, and even ruptured. A...
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