PVP-b-PEO block copolymers for stable aqueous and ethanolic graphene dispersions
作者： Suguna Perumal , Kyung Tae Park , Hyang Moo Lee , In Woo Cheong
DOI: 10.1016/J.JCIS.2015.11.014
关键词: Raman spectroscopy 、 Styrene 、 Nanocomposite 、 Chemical engineering 、 Copolymer 、 Pyrolytic carbon 、 Graphene 、 Ethylene oxide 、 Chemistry 、 Thermogravimetric analysis 、 Polymer chemistry
摘要: The ability to disperse pristine (unfunctionalized) graphene is important for various applications, coating, nanocomposites, and energy related systems. Herein we report that amphiphilic copolymers of poly(4-vinyl pyridine)-block-poly(ethylene oxide) (PVP-b-PEO) are able with high concentrations about 2.6mg/mL via sonication centrifugation. Ethanolic aqueous highly-ordered pyrolytic graphite (HOPG) dispersions block were prepared they compared the stabilized by P-123 Pluronic® (P123) poly(styrene)-block-poly(ethylene (PS-b-PEO) synthesized. Transmission electron microscopy, scanning atomic force X-ray diffraction, Raman UV-visible spectroscopic studies confirmed PVP-b-PEO better stabilizers HOPG than P123 PS-b-PEO. photoelectron spectroscopy force-distance (F-d) curve analyses revealed nitrogen vinyl pyridine plays a vital role in attractive interaction surface sheet. Thermogravimetric analysis showed larger amount was adsorbed onto longer pyridine) (PVP) length medium, respectively, which consistent electrical conductivity decreases. This study presents dispersion efficiency using varies substantially depending on lengths their hydrophobic domains.
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