Mesoporous polymer nanocomposites

NANOSTRUCTURED SOLIDS MICRO- AND MESOPOROUS MATERIALS AND POLYMER NANOCOMPOSITES... 

Since the 1990s, mesoporous materials have attracted a great deal of attention based on their apphcations in the fields of molecular sorption, ahgnment, confinement, and the formation of nanoclusters. Unlike microporous zeohtes, these materials are usuaUy prepared via template methods, and have ordered hexagonal or cubic charmels with pore diameters ranging from 2 to 10 nm. The internal surface of the mesoporous materials can be modified by covalently anchoring a number of functional groups to their channel walls. Thus, mesoporous materials are also attractive in view not only of controlled polymerization but also the formation of polymer nanocomposites [10]. 

Wei LM, Hu NT, Zhang YF (2010) Synthesis of polymer-mesoporous silica nanocomposites. Materials 3(7) 4066 1079... 

Liu, YR. (2009) One-pot route to synthesize ordered mesoporous polymer/silica and carbon/sflica nanocomposites using poly (dimethylsiloxane)-poly(elhylene oxide) (PDMS—PEO) as co-template. Microporous and Mesoporous Materials, 124,190-196. 

Invented less than a decade ago,1 EISA has rapidly developed into a universal technique for fabrication of organized porous and patterned nanocomposite materials, ranging from metal oxides and chalcogenides to carbons, polymers, and metals.2,3 In addition to generating ordered mesoporous films, this technique may also be used to incorporate functional molecules and... 

PDMS nanocomposites with layered mica-type silicates were also reported.374 A two-step sol-gel process of the in situ precipitation of silica led to the development of siloxane-based nanocomposites with particularly high transparencies.3 5 Some unusual nanocomposites prepared by threading polymer chains through zeolites, mesoporous silica, or silica nanotubes were reviewed.3 6 Poly(4-vinylpyridine) nanocross-linked by octa(propylglycidyl ether) polyhedral oligomeric silsesquioxane was reported.377... 

We measured the electrical conductivity of Pt-C nanocomposites using two-point measurements. In a representative example the NP-polymer hybrid had a conductivity of 2.5 mS cm-1, which increased to 400 S cm-1 upon pyrolysis. Despite the presence of carbon, to the best of our knowledge this value represented the highest electrical conductivity yet measured for ordered mesoporous materials derived from block copolymers. This discovery creates a potential pathway to a new class of ordered mesoporous metals made from nanoparticles of different elements and/or distinct compositions. Such nano-heterogeneous mesoporous metals may have a range of exceptional electrical, optical, and catalytic properties. 

Kawashima, D., Aihara, T., Kobayashi, Y., Kyotani, T., and Tomita, A. Preparation of mesoporous carbon from organic polymer/silica nanocomposite. Chem. Mater. 12, 2000 3397-3401. 

F. F. Fang, H. J. Choi, W. S. Ahn, Electroactive Response of Mesoporous Silica and Its Nanocomposites with Conducting Polymers. Compos. Sci. Technol. 2009,69,2088-2092. 

EE Eang, H.J. Choi, W.S. Ahn, Electroactive response of mesoporous silica and its nanocomposites with conducting polymers. Compos. Sci. Tech., 2009, 69, 2088. 

The synthesis of functional polymers inside mesoporous materials has been investigated for the preparation of organic-inorganic nanocomposites, and a... 

Frisch, H. L. Mark, J. E., Nanocomposites Prepared by Threading Polymer Chains through Zeolites, Mesoporous Silica, or Silica Nanotuhes. Chem. Mater. 1996, 8,1735-1738. 

Liu, R., Shi, Y., Wan, Y. et al. 2006. Triconstitnent co-assembly to ordered mesostructured polymer-sUica and carbon-sUica nanocomposites and large-pore mesoporous carbons with high surface areas. J. Am. Chem. Soc. 128 11652-11662. 

Lee T, Park SS, Jung Y, Han S, Han D, Kim I, Ha C-S (2009) Preparation and characterization of polyimide/mesoporous silica hybrid nanocomposites based on water-soluble poly (amic acid) ammonium salt. Eur Polym J 45(1) 19-29... 

Very little data exists on the fracture toughness of porous silicon. However two studies suggest that optimized nanocomposites (see hand book chapter Polymer-Porous Silicon Composites ) could exhibit much higher toughness than nonporous silicon. An experimental study reported that the inclusion of poly-phenylene vinylene polymers into oxidized mesoporous silicon could yield toughness values more than five times higher than that of their bulk silicon control (Ni et al 2005). The maximum value reported for a polymer-impregnated mesoporous film on a wafer was 4.2 MPa. 

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