Helicity- and Molecular-Weight-Driven Self-Sorting and Assembly of Helical Polymers towards Two-Dimensional Smectic Architectures and Selectively Adhesive Gels.

ABSTRACT

Self-sorting plays a crucial role in living systems such as the selective assembly of DNA and specific folding of proteins. However, the self-sorting of artificial helical polymers such as biomacromolecules has rarely been achieved. In this work, single-handed helical poly(phenyl isocyanide)s bearing pyrene (Py) and naphthalene (Np) probes were prepared, which exhibited interesting self-sorting properties driven by both helicity and molecular weight (Mn ) in solution, solid state, gel, and on the gel surface as well. The polymers with the same helix sense and similar Mn can self-sort and assemble into well-defined two-dimensional smectic architectures and form stable gels in organic solvents. In contrast, mixed polymers with opposite handedness or different Mn were repulsive to each other and did not aggregate. Moreover, the gels of helical polymers with the same handedness and similar Mn can recognize themselves and adhere together to form a gel.