Preparation of Two-dimensional Nanosheets from Crystallization-driven Self-assembly of Copolypeptoids in Aqueous Solution
Amphiphilic copolymers can self-assemble into micelles in aqueous solution with hydrophilic segment as corona and the hydrophobic part as inner core.In this work,we syn-thesized diblock copolypeptoids modified with amino groups poly(N-allylglycine)-b-poly(N-octylglycine)(PNAG-g-NH2)-b-PNOG)by ring-opening polymerization and thiol-ene click chemistry,and studied its crystallization-driven self-assembly(CDSA)behaviors in aqueous solution.The results showed that the deprotonation of the amine groups reduces the hydro-philicity of PNAG-g-NH2 and the colloidal stability of micelles,which facilitates the forma-tion of nanosheets.Meanwhile,more nanosheets were formed due to the crystallization of PNOG after cooling to room temperature slowly,and the nanosheet structure remained after the pH of the micellar solution was adjusted to 6.5.2D irregular nanosheets were observed by transmission electron microscope(TEM).
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