Macromolecules of various complex topologies were constructed via dynamic-covalent linkages, including boronic esters, Diels-Alder adducts, disulfides, and hydrazones. Diblock copolymers with one reactive block and one �passive� block were prepared by reversible addition-fragmentation chain transfer (RAFT) polymerization. Addition of a complimentary difunctional small molecule led to intermolecular crosslinking of the reactive block to result in star copolymers with cores crosslinked via dynamic-covalent bonds. The kinetics of self-assembly and the morphology of the resulting stars were investigated as a function of block copolymer and crosslinker concentrations and stoichiometry. The reversible nature of the crosslinks within the cores allowed the stars to reversibly reconfigure their macromolecular topology via competitive exchange reactions or by manipulation of the dynamic-covalent equilibrium.

Dynamic-covalent nanoparticles as responsive materials

245th National Meeting (2013)

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