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Microwave-assisted Functionalization of Poly(ethylene glycol) and On-resin Peptides for Use in Chain Polymerizations and Hydrogel Formation

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A Hyperbranched Poly(ethyleneimine) Grown on Surfaces.

Kim¹, Moon, Park

¹Department of Chemistry, Division of Molecular and Life Sciences, Pohang University of Science and Technology, San 31 Hyoja-dong, Pohang, 790-734, Korea

Journal of Colloid and Interface Science

|June 22, 2000

Summary

Researchers created hyperbranched polymers on solid supports using aminosilylated substrates and aziridines. This method successfully initiated ring-opening polymerization, significantly increasing primary amine density on the surface.

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Area of Science:

Polymer Chemistry
Surface Science
Materials Science

Background:

Hyperbranched polymers offer unique properties due to their complex architecture.
Controlled synthesis of polymers on solid supports is crucial for advanced material applications.
Poly(ethyleneimine) (PEI) is a versatile polymer with numerous applications.

Purpose of the Study:

To develop a method for synthesizing hyperbranched polymers on solid supports.
To investigate the initiation mechanism of aziridine polymerization by primary amines.
To control polymer architecture, achieving both branched and linear structures.

Main Methods:

Aminosilylation of solid supports (silicon wafer, fused silica).
Ring-opening polymerization of aziridines initiated by surface primary amines.
Stepwise growth using protected aziridines (benzyl 1-aziridinecarboxylate) for controlled synthesis.

Main Results:

Successful preparation of hyperbranched poly(ethyleneimine) on solid supports.
Demonstrated that surface primary amines effectively initiate aziridine polymerization.
Achieved a dramatic increase in surface primary amine density (3.5 to 66 amines/nm(2)).
Controlled synthesis yielded linear poly(ethyleneimine) chains via a stepwise chain growth and deprotection process.

Conclusions:

Aminosilylated substrates are effective platforms for synthesizing hyperbranched polymers.
The described method allows for the controlled formation of both hyperbranched and linear polymer architectures.
This approach offers a route to functionalized surfaces with high amine density.