Molecular Bottlebrushes Featuring Brush-on-Brush Architecture
2019
Molecular bottlebrushes featuring brush-on-brush (BoB) architecture were prepared by combining azide–alkyne
click chemistry,
ring-opening polymerization(ROP), and
atom transfer radical polymerization(ATRP). Primary
side chainsof diblock copolymers with a poly(e-
caprolactone) (PCL) block and a poly(α-bromo-e-
caprolactone) (P(CL-Br)) block were synthesized by ROP and then grafted onto PCL backbone by the click reaction. Then the secondary
side chainsof poly(oligo(ethylene glycol) acrylate) (POEGA) were grafted from the P(CL-Br) block by ATRP, yielding an amphiphilic core/shell structure. Imaging of individual macromolecules by atomic force microscopy (AFM) demonstrated dramatically thickened wormlike formation with distinct hairy
side chains. Interestingly, for the BoB molecular bottlebrushes with enough long primary and secondary
side chains, sufficient tension can be generated along the backbone and thus lead to its cleavage.
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