Photomediated Cationic Ring-Opening Polymerization of Cyclosiloxanes with Temporal Control.

ABSTRACT: Precision synthesis of polyorganosiloxanes and temporal control over the polymerization process during ring-opening polymerization (ROP) of cyclosiloxanes remain challenging due to the occurrence of side reactions, e.g., intramolecular transfer (backbiting) and intermolecular chain transfer, and irreversible catalyst transformation. In this study, a merocyanine-based photoacid catalyst is developed for cationic ROP of different cyclosiloxanes. A series of well-defined cyclotrisiloxane polymers with predetermined molar masses and low dispersities (Đ < 1.30) are successfully synthesized under various conditions (i.e., different catalyst loadings, initiator concentrations, solvents, and monomer types). Mechanistic insights by experiments and theoretical calculations suggest that the ca

SUBMITTER: Zhang W 

PROVIDER: S-EPMC11600145 | biostudies-literature | 2024 Nov

REPOSITORIES: biostudies-literature