|332. Joso, R.; Reinicke, S.; Walther, A.; Schmalz, H.; Müller, A.H.E.; Barner, L.: Facile Access to Hydroxy-Functional Core-Shell Microspheres via Grafting of Ethylene Oxide by Anionic Ring-Opening Polymerization, Macromol. Rapid Commun. 30, 1009 (2009) -- DOI: 10.1002/marc.200900031 -- PDF|
|Stichworte: anionic polymerization, core-shell polymers, polymer grafting, ring-opening polymerization|
We present a facile access route to hydroxyl-functional narrow disperse microspheres of well-defined grafting density. Ethylene oxide has been grafted from highly crosslinked poly(divinyl benzene) microspheres by anionic ring opening polymerization using sec-butyllithium as initiator together with the phosphazene base t-BuP4. Initially, core microspheres have been prepared by precipitation polymerization utilizing divinyl benzene (DVB, 80 wt.-%). The grafting of poly(ethylene oxide) 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 µm and the particle weight increased by 5.7%. The microspheres were characterized by SEM, FT-IR spectroscopy, elemental analysis and fluorescence microscopy. The surface grafting density (determined via two methods) was 1.39 ±0.06 and 1.76 ±0.08 chains·nm-2, respectively.
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