Facile Access to Hydroxy-Functional Core-Shell Microspheres via Grafting of Ethylene Oxide by Anionic Ring-Opening Polymerization

Titelangaben

Joso, Raymond ; Reinicke, Stefan ; Walther, Andreas ; Schmalz, Holger ; Müller, Axel H. E. ; Barner, Leonie:
Facile Access to Hydroxy-Functional Core-Shell Microspheres via Grafting of Ethylene Oxide by Anionic Ring-Opening Polymerization.
In: Macromolecular Rapid Communications. Bd. 30 (2009) Heft 12 . - S. 1009-1014.
ISSN 1521-3927
DOI: https://doi.org/10.1002/marc.200900031

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Abstract

We present a facile access route to hydroxy-functional narrow disperse microspheres of well-defined grafting density (GD). Ethylene oxide has been grafted from highly crosslinked poly(divinyl benzene) microspheres by anionic ring-opening polymerization using sec-butyllithium as activator together with the phosphazene base t-BuP(4). Initially, core microspheres have been prepared by precipitation polymerization utilizing divinyl benzene (DVB, 80 wt.-%). The grafting of poly(ethylene oxide) (PEO) from the surface resulted in the formation of functional core-shell microspheres with hydroxy-terminal end groups. The number average particle diameter of the grafted microspheres was 3.6 mu m and the particle weight increased by 5.7%. The microspheres were characterized by SEM, FT-IR spectroscopy, elemental analysis, and fluorescence microscopy. The surface GD (determined via two methods) was 1.65 +/- 0.06 and 2.09 +/- 0.08 chains.nm(-2), respectively.