Cyclic Polymers: Controlled Synthesis, Properties and Perspectives

Abstract

Recently, cyclic polymers have attracted increasing interest due to their unique topologies, properties, and functions compared to the linear analogues. This mini-review focuses on the recent advances in the synthesis and applications of cyclic polymers. First, the main synthetic methods for cyclic polymers, namely ring closure and ring expansion methods, are presented and discussed, followed by a review on the exploration of the properties and applications of synthetic cyclic polymers. Finally, a critical assessment of the preliminary studies exploring the efficient synthesis and potential applications of cyclic polymers are presented, and the remaining challenges in the field as well as ideas for solving these challenges will be discussed.

Loop to linear: exploring the impact of corona topology on the properties of self-assembled polymer nanoparticles

“…Cyclic polymers, characterised by their unique looped topology, can be synthesised via various methods. 21–26 Compared to their linear analogues, cyclic polymers possess the same chemical composition and molecular weight yet exhibit distinctively different physical properties. 27–29 One of the most significant differences lies in their hydrodynamic behaviours, which indicate how macromolecules interact with and move through the solvent system.…”

A Versatile Cyclic Clickable Platform by Ring-Expansion Metathesis Polymerization: Cyclic Glycopolymers with Lectin-Binding Ability

“…The synthesis of cyclic polymers primarily employs two strategies: ring closing − or ring-expansion polymerization (REP). , REP, particularly through ring-expansion metathesis polymerization (REMP), offers versatility in creating topologically pure and structurally homogeneous cyclic polymers at high concentrations. This is achieved by the continuous insertion of cyclic monomers into a reactive bond, eliminating the entropic cost associated with intramolecular ring closing techniques .…”

Controlled synthesis of cyclic helical polyisocyanides and bottlebrush polymers using a cyclic alkyne–Pd(ii) catalyst

“…Therefore, a method for the controlled synthesis of cyclic helical polyisocyanides needs to be explored. 39…”