Synthesis of Discrete Block Copolymers and their Self-Assembly Behaviors in Solution
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The molecular weight distribution (MWD) of block copolymers (BCPs) is known to affect their self-assembly in solution. However, the self-assembly of discrete BCPs which don’t possess MWD has not been studied to this date. Herein, we report the self-assembly of BCPs having a discrete branched poly(ethylene glycol) (bPEG) hydrophilic block and a discrete hydrophobic poly(rac-phenyllactic acid) block in solution. Each discrete polymer block was prepared by iterative coupling strategy and coupled to form a series of amphiphilic BCPs having different molecular weights of poly(rac-phenyllactic acid) blocks. The phase transition of the self-assembled discrete BCPs was observed in solutions with different solvent compositions