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Controlled Photoredox Ring-Opening Polymerization of O-Carboxyanhydrides Mediated by Ni/Zn Complexes
Published on: November 21, 2017
New ground for organic catalysis: a ring-opening polymerization approach to hydrogels
Fredrik Nederberg1, Vivian Trang, Russell C Pratt
1IBM Almaden Research Center, 650 Harry Road, San Jose, CA 95120, USA.
Biomacromolecules
|November 13, 2007
Summary
This study introduces an organocatalytic living polymerization method for creating hydrogel networks from cyclic carbonate macromolecules. This efficient technique offers enhanced kinetic control and produces highly swellable polymer networks with a porous structure.
Area of Science:
- Polymer Chemistry
- Materials Science
- Organic Chemistry
Background:
- Hydrogels are crucial in various applications, including drug delivery and tissue engineering.
- Developing efficient and controlled polymerization methods for hydrogel synthesis is an ongoing challenge.
Purpose of the Study:
- To present an organocatalytic living polymerization approach for synthesizing hydrogel networks.
- To investigate the use of cyclic carbonate-functionalized macromolecules and amidine catalysts.
Main Methods:
- Organocatalytic ring-opening polymerization of cyclic carbonate macromonomers using alcoholic initiators.
- Utilizing 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) as an organic catalyst.
- Employing co-monomer addition (trimethylene carbonate) for enhanced kinetic control.
Main Results:
- Achieved near-quantitative monomer to polymer conversion (>96%) with co-monomer addition.
- Synthesized poly(ethylene glycol) networks exhibiting significant swelling in water.
- Observed an open, co-continuous water-gel porous structure via scanning electron microscopy.
Conclusions:
- Organocatalytic ring-opening polymerization offers a simple, efficient, and versatile route to hydrogel networks.
- The developed method provides precise control over polymer network formation.
- The resulting hydrogels possess desirable properties for potential applications.
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