Interfacial enhancement of maleated polypropylene/silica composites using graphene oxide

Graphene oxide (GO) is derived from oxidization of natural graphite and contains many active groups. These active groups make GO a potential compatibilizer for polymer blends or coupling agent for polymer composites. In this work, a novel core-shell structured hybrid submicroparticles of graphene oxide-encapsulated silica (GO-SiO2) were fabricated using GO sheets via an electrostatic assembly between ultrathin negatively charged graphene oxide sheets and positively charged amino-modified silica. The possible application of this new hybrid filler was explored in preparation of maleated polypropylene (PP-g-MA)/GO-SiO2 composites. The microstructure and interface enhancement of the prepared composites were analyzed by SEM, TEM, OM, TGA, FTIR, and DMA measurements. A uniform dispersion of GO-SiO2 hybrids, enhanced interfacial adhesion and improved mechanical property were evidenced. The reason might be that graphene oxide can be covalently assembled onto the amino-modified silica surface, and simultaneously it provides strong interaction with the PP-g-MA due to similar polarity or possible hydrogen bonding. This work suggests a potential application of graphene oxide-encapsulated particle in preparation of high performance polymer composites. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012

[1]  G. Fudenberg,et al.  Ultrahigh electron mobility in suspended graphene , 2008, 0802.2389.

[2]  J. L. McChesney,et al.  Synthesis and characterization of atomically thin graphite films on a silicon carbide substrate , 2006 .

[3]  Franklin Kim,et al.  Graphene oxide sheets at interfaces. , 2010, Journal of the American Chemical Society.

[4]  S. Stankovich,et al.  Restoring electrical conductivity of dielectrophoretically assembled graphite oxide sheets by thermal and chemical reduction techniques , 2009 .

[5]  C. Berger,et al.  Epitaxial graphene , 2007, 0704.0285.

[6]  Edward T. Samulski,et al.  Exfoliated Graphene Separated by Platinum Nanoparticles , 2008 .

[7]  R. Ruoff,et al.  Graphene-based ultracapacitors. , 2008, Nano letters.

[8]  P. Kamat,et al.  TiO2-graphene nanocomposites. UV-assisted photocatalytic reduction of graphene oxide. , 2008, ACS nano.

[9]  D. Dikin,et al.  Graphene Oxide Sheets Chemically Cross-Linked by Polyallylamine , 2009 .

[10]  J. J. Gracio,et al.  Surface Modification of Graphene Nanosheets with Gold Nanoparticles: The Role of Oxygen Moieties at Graphene Surface on Gold Nucleation and Growth , 2009 .

[11]  Kang L. Wang,et al.  A chemical route to graphene for device applications. , 2007, Nano letters.

[12]  Chao Zhang,et al.  One‐Step Ionic‐Liquid‐Assisted Electrochemical Synthesis of Ionic‐Liquid‐Functionalized Graphene Sheets Directly from Graphite , 2008 .

[13]  Prashant V Kamat,et al.  Anchoring semiconductor and metal nanoparticles on a two-dimensional catalyst mat. Storing and shuttling electrons with reduced graphene oxide. , 2010, Nano letters.

[14]  R. Shanks,et al.  Morphology, Thermal Stability, and Mechanical Behavior of [Poly(propylene)‐grafted Maleic Anhydride]‐Layered Expanded Graphite Oxide Composites , 2007 .

[15]  L. Brinson,et al.  Functionalized graphene sheets for polymer nanocomposites. , 2008, Nature nanotechnology.

[16]  Ying Wang,et al.  Preparation, Structure, and Electrochemical Properties of Reduced Graphene Sheet Films , 2009 .

[17]  A. Govindaraj,et al.  Graphene: the new two-dimensional nanomaterial. , 2009, Angewandte Chemie.

[18]  Dongmin Chen,et al.  Synthesis and Solid-State NMR Structural Characterization of 13C-Labeled Graphite Oxide , 2008, Science.

[19]  Franklin Kim,et al.  Langmuir-Blodgett assembly of graphite oxide single layers. , 2009, Journal of the American Chemical Society.

[20]  Jun-Ho Lee,et al.  Graphene oxide porous paper from amine-functionalized poly(glycidyl methacrylate)/graphene oxide core-shell microspheres , 2010 .

[21]  Jacek Klinowski,et al.  Structure of Graphite Oxide Revisited , 1998 .

[22]  Rui M. Almeida,et al.  Characterization of silica gels by infrared reflection spectroscopy , 1990 .

[23]  S. Stankovich,et al.  Synthesis of graphene-based nanosheets via chemical reduction of exfoliated graphite oxide , 2007 .

[24]  Klaus Müllen,et al.  Two-dimensional graphene nanoribbons. , 2008, Journal of the American Chemical Society.

[25]  Jiachun Feng,et al.  Alkyl-functionalized graphene nanosheets with improved lipophilicity , 2010 .

[26]  C. N. Lau,et al.  Superior thermal conductivity of single-layer graphene. , 2008, Nano letters.

[27]  K. Char,et al.  Hollow Capsules of Reduced Graphene Oxide Nanosheets Assembled on a Sacrificial Colloidal Particle , 2010 .

[28]  J. Kysar,et al.  Measurement of the Elastic Properties and Intrinsic Strength of Monolayer Graphene , 2008, Science.

[29]  W. Stark,et al.  Surfactant‐Free, Melt‐Processable Metal–Polymer Hybrid Materials: Use of Graphene as a Dispersing Agent , 2008 .

[30]  R. Ruoff,et al.  Chemical methods for the production of graphenes. , 2009, Nature nanotechnology.

[31]  Prashant V Kamat,et al.  Graphene-semiconductor nanocomposites: excited-state interactions between ZnO nanoparticles and graphene oxide. , 2009, Langmuir : the ACS journal of surfaces and colloids.

[32]  K. Müllen,et al.  Fabrication of graphene-encapsulated oxide nanoparticles: towards high-performance anode materials for lithium storage. , 2010, Angewandte Chemie.

[33]  Tae Hee Han,et al.  Peptide/Graphene Hybrid Assembly into Core/Shell Nanowires , 2010, Advanced materials.

[34]  S. Stankovich,et al.  Preparation and characterization of graphene oxide paper , 2007, Nature.

[35]  Chao Gao,et al.  Making silica nanoparticle-covered graphene oxide nanohybrids as general building blocks for large-area superhydrophilic coatings. , 2011, Nanoscale.

[36]  Xu Du,et al.  Approaching ballistic transport in suspended graphene. , 2008, Nature nanotechnology.

[37]  Stephen Mann,et al.  Fabrication of Graphene–Polymer Nanocomposites With Higher‐Order Three‐Dimensional Architectures , 2009 .

[38]  G. Shi,et al.  Strong and ductile poly(vinyl alcohol)/graphene oxide composite films with a layered structure , 2009 .

[39]  S. Stankovich,et al.  Graphene-based composite materials , 2006, Nature.

[40]  Shaoyun Guo,et al.  Kinetics of thermo-oxidative degradation of zinc borate/microcapsulated red phosphorus with magnesium hydroxide in flame retarded polypropylene composites , 2009 .

[41]  G. Wallace,et al.  Processable aqueous dispersions of graphene nanosheets. , 2008, Nature nanotechnology.

[42]  Franklin Kim,et al.  Graphene Oxide: Surface Activity and Two‐Dimensional Assembly , 2010, Advanced materials.

[43]  Roberto Car,et al.  Functionalized single graphene sheets derived from splitting graphite oxide. , 2006, The journal of physical chemistry. B.

[44]  Andre K. Geim,et al.  Electric Field Effect in Atomically Thin Carbon Films , 2004, Science.

[45]  Andre K. Geim,et al.  The rise of graphene. , 2007, Nature materials.

[46]  Jinqing Wang,et al.  Tribology study of reduced graphene oxide sheets on silicon substrate synthesized via covalent assembly. , 2010, Langmuir : the ACS journal of surfaces and colloids.

[47]  H. Zou,et al.  Polymer/silica nanocomposites: preparation, characterization, properties, and applications. , 2008, Chemical reviews.

[48]  M. Rong,et al.  Performance improvement of nano-silica/polypropylene composites through in-situ cross-linking approach , 2008 .

[49]  Min Zhu,et al.  Preparation and nano/microtribological properties of perfluorododecanoic acid (PFDA)–3-aminopropyltriethoxysilane (APS) self-assembled dual-layer film deposited on silicon , 2008 .

[50]  Kwang S. Kim,et al.  Large-scale pattern growth of graphene films for stretchable transparent electrodes , 2009, Nature.