Related Experiment Video
Updated: Jun 3, 2026

Particles without a Box: Brush-first Synthesis of Photodegradable PEG Star Polymers under Ambient Conditions
Published on: October 10, 2013
Highly efficient synthesis of low polydispersity core cross-linked star polymers by Ru-catalyzed living radical
Tor Kit Goh1, Satoshi Yamashita, Kotaro Satoh
1Polymer Science Group, Department of Chemical and Biomolecular Engineering, The University of Melbourne, Victoria 3010, Australia.
Abstract:
The efficient formation of low polydispersity core cross-linked star (CCS) polymers via controlled/living radical polymerization (LRP) and the arm-first approach was found to be dependent on the mediating catalyst system. The Ru catalyst, Ru(Ind)Cl(PPh₃)₂ Cat. 1, and tertiary amine co-catalyst were used to synthesize highly living poly(methyl methacrylate) (PMMA) macroinitiators, which were then linked together with ethylene glycol dimethacrylate (EGDMA) to form PMMA(arm)PEGDMA(core) CCS polymers. The quantitative and near-quantitative synthesis of CCS polymers were observed for low to moderate molecular weight macroinitiators (M(n) = 8 and 20 kDa), respectively. Lower conversions were observed for high-molecular weight macroinitiators (M(n) ≥ 60 kDa). Overall, an improvement of between 10 and 20% was observed when comparing the Cat. 1 system to a conventional Cu-catalyzed system. This significant improvement in macroinitiator-to-star conversion is explained in the context of catalyst system selection and CCS polymer formation.
More Related Videos
Related Concept Videos
Radical Chain-Growth Polymerization: Mechanism
Radical Chain-Growth Polymerization: Overview
Free-Radical Chain Reaction and Polymerization of Alkenes
Radical Chain-Growth Polymerization: Chain Branching
Ziegler–Natta Chain-Growth Polymerization: Overview
Cationic Chain-Growth Polymerization: Mechanism

