文摘
A well-defined Hamilton wedge (HW) midchain functionalized block copolymer, i.e., polyethylene glycol-b-polystyrene (PEG-HW-PS, Mn,GPC = 5600 Da, PDI = 1.03), was successfully synthesized via a combination of atom transfer radical polymerization (ATRP) and copper-catalyzed azide alkyne cycloaddition (CuAAC). An 伪,蠅-cyanuric acid (CA) difunctional linear homopolymer poly(n-butylacrylate) (CA-PnBA-CA, Mn,GPC = 8100 Da, PDI = 1.09) was concomitantly prepared via reversible addition鈥揻ragmentation chain transfer (RAFT) polymerization. Supramolecular H-shaped macromolecules were鈥攆or the first time鈥攑repared through supramolecular self-assembly between HW and CA recognition motifs to generate (PS-b-PEG)路PnBA路(PS-b-PEG) and (PS-b-PS)路PnBA路(PS-b-PS) in CH2Cl2 or dichloromethane-d2 at ambient temperature. The self-assembly process (at a total concentration of the two species of close to 4.5 mM) was evidenced by proton nuclear magnetic resonance (1H NMR) spectroscopy, diffusion-ordered NMR spectroscopy (DOSY), and dynamic light scattering (DLS) analyses. The results derived via DOSY NMR experiments and DLS combined with a Job plot analysis and in-depth NMR titration experiments indicate that the formation of supramolecular H-shaped macromolecules in 2:1 stoichiometry is efficiently occurring via the employed complementary recognition motifs with high binding constants (between 1.2 and 1.5 脳 105 L mol鈥? at ambient temperature).