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- W2034677006 abstract "We report the controlled growth of poly(ethylene glycol) methyl ether grafted polymethacrylate (PEGPMA) on nanosized zeolite external surfaces using the atom transfer radical polymerization (ATRP) approach. As-synthesized amino-modified faujasite zeolite nanoparticles (40 nm) were reacted with 2-bromoisobutyryl bromide to covalently bond bromine onto the zeolitic surfaces. The bromine atoms then serve as initiators for ATRP, allowing growth of a variety of polymer tethers onto the nanozeolite surfaces. The PEGPMA polymer has a unique structure in which very flexible PEO oligomers are bonded to stiff polymethacrylate backbones. This structure makes it possible to synthesize nanohybrid materials with a fully amorphous polymer phase, a main requirement for conductivity of solid polymer electrolytes. Raman spectroscopy and 13C solid-state NMR spectroscopy were used to characterize the as-synthesized samples. Furthermore, both Raman spectroscopy and polymer molecular weight determinations demonstrated the controlled growth of polymer chains in the ATRP synthesis. DSC experiments indicated that a fully amorphous polymer phase can be achieved by properly controlling the polymerization conditions. The morphology of the polymer phase in PEGPMA−nanoNaX composites is very stable. DSC cycling scans in the temperature range −150 to 100 °C did not induce crystallization of the amorphous polymer segments. TEM images demonstrate significant variation of the zeolite surface properties after modification with polymer tethers, indicating that very dense hybrid zeolite-based thin films or membranes could be achieved using simple solvent-cast spin-coating techniques." @default.
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- W2034677006 date "2004-03-23" @default.
- W2034677006 modified "2023-09-27" @default.
- W2034677006 title "Functionalization of a Nano-Faujasite Zeolite with PEG-Grafted PMA Tethers Using Atom Transfer Radical Polymerization" @default.
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- W2034677006 doi "https://doi.org/10.1021/ma035062z" @default.
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