Work

(AB) n Star Block Polymers Derived from CO 2 : Influence of Architecture and Postpolymerization Modification

Year: 2025

Type: article

Abstract: High Resolution Image Download MS PowerPoint Slide The utilization of CO 2 as a sustainable feedstock for oxygenated polymers offers a promising route to high-performance materials while addressing environmental challenges. This study investigates the synthesis of high-molar-mass, nonlinear polymer architectures using switchable catalysis, focusing on multiarm star block polymers derived from vinyl-cyclohexene oxide (vCHO), CO 2, and ε-decalactone (ε-DL). A [Zn(II)Mg(II)] organometallic catalyst and multifunctional chain-transfer agents (CTAs) are employed in a “core-first” approach to produce tri-, tetra-, and hexafunctional star block polymers. Thermomechanical and morphological properties were evaluated as a function of molar mass, number of arms, and architecture, indicating the differences between star and linear structures. Postpolymerization modification of the polycarbonate block, via thiol–ene chemistry, introduced pendant hydroxyl groups, enhancing hydrogen bonding and microphase separation, significantly impacting thermal and mechanical performance. This work highlights the versatility of switchable catalysis in accessing star polymers while underscoring the potential of integrating architectural control and functionalization to enhance the performance and applicability of CO 2 -derived poly(ester- b -carbonate)s.

Source: Macromolecules

DOI: 10.1021/acs.macromol.5c01236

Authors: Gregory S. Sulley, Kam C. Poon, Georgina L. Gregory, Charlotte K. Williams

Institution: University of Oxford

Language: English

Topic: biodegradable polymer synthesis and properties

Subfield: Biomaterials

Field: Materials Science

Domain: Physical Sciences

SDGs: Climate action, Responsible consumption and production

Open Access status: hybrid

Estimated APC paid: $4,500