Construction of a Reactive Diblock Copolymer, Polyphosphoester-block-Poly(L？lactide), as a Versatile Framework for Functional Materials That Are Capable of Full Degradation and Nanoscopic Assembly Formation
- Construction of a Reactive Diblock Copolymer, Polyphosphoester-block-Poly(L？lactide), as a Versatile Framework for Functional Materials That Are Capable of Full Degradation and Nanoscopic Assembly Formation
- 조상호; Young H. Lim; 허규성; Karen L. Wooley
- Issue Date
- ACS Macro Letters
- VOL 2, NO 9-789
- The development of a diblock copolymer, polyphosphoester-block-poly(L-lactide), which has potential for being fully degradable and biocompatible, was achieved by one-pot sequential ring-opening polymerizations (ROPs) of two cyclic monomers: alkyne-functionalized phospholane and L-lactide (LLA). A kinetic study of the polymerization in each step was investigated in a detailed manner by nuclear magnetic resonance (NMR) spectroscopy and gel permeation chromatography (GPC), revealing living/controlled characteristics with narrow molecular weight distributions and a linear increase of molecular weights vs monomer conversion and time. Subsequently, photoinduced thiol-yne "click" reactions with small-molecule thiols bearing either carboxylic acid or amino groups afforded amphiphilic diblock copolymers with carboxylate or amino side-chain functionalities along the polyphosphoester segment of the diblock copolymer backbone. Finally, direct dissolution of the two different types of amphiphilic diblock copolymers in aqueous solutions yielded well-defined spherical micelles with corresponding negative or positive surface charges, respectively, as confirmed by transmission electron microscopy (TEM), dynamic light scattering (DLS), and zeta potential analyses.
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