Controlled Supramolecular Architecture Transformation from Homopolymer to Copolymer through Competitive Self-Sorting...

Area of Science:

• Polymer Chemistry
• Supramolecular Chemistry
• Materials Science

Background:

• Supramolecular copolymers offer enhanced properties over homopolymers but are complex to synthesize.
• Existing methods for supramolecular copolymer synthesis are often time-consuming and intricate.

Purpose of the Study:

• To develop a facile and efficient method for synthesizing supramolecular hyperbranched alternating copolymers.
• To demonstrate the transformation of a supramolecular homopolymer into a copolymer using a competitive self-sorting strategy.

Main Methods:

• Utilized an AB2-based supramolecular hyperbranched homopolymer constructed from dialkylammonium salt (DAAS)-functionalized pillar[5]arene (MeP5) monomers.
• Introduced a CD2 monomer featuring a competitive neutral guest moiety (TAPN) and two receptive benzo-21-crown-7 host moieties (B21C7).
• Applied the "competitive self-sorting" strategy to disrupt and reassemble the polymer structure.

Main Results:

• Successfully transformed the AB2-type homopolymer into an AB2+CD2-type supramolecular hyperbranched alternating copolymer.
• The transformation was driven by the competitive self-sorting interactions between MeP5-TAPN and B21C7-DAAS host-guest pairs.
• Demonstrated a direct and convenient method for polymer structure conversion.

Conclusions:

• The "competitive self-sorting" strategy provides a straightforward route to synthesize supramolecular hyperbranched alternating copolymers.
• This approach simplifies the synthesis of complex polymer architectures, overcoming limitations of traditional methods.
• Offers a new pathway for designing and creating functional supramolecular materials.