By a News Reporter-Staff News Editor at Science Letter -- Researchers detail new data in Nanocomposites. According to news reporting out of St. Martin Dheres, France, by NewsRx editors, research stated, "Impressive mechanical properties and reinforcing capability make cellulose nanocrystal (CN) a promising candidate as biomass nanofiller for the development of polymer-based nanocomposites. With the recent announcement of large-scale CN production, the use of industrial processing techniques for the preparation of CN-reinforced nanocomposites, such as extrusion, is highly required."
Our news journalists obtained a quote from the research from the Grenoble Institute of Technology, "However, low thermal stability of sulfuric acid-prepared CN limits the processing since most polymeric matrices are processed at temperatures dose to 200 degrees C or above. It has been proved that surface adsorption of polymers on CN as compatibilizer, such as hydrophilic polyoxyethylene (PEO), can improve its thermal stability due to the shielding and wrapping of PEO. However, the weak combination between CN and PEO allows the free movement of surface polymer, which can induce the self-aggregation of CN and microphase separation in composites especially during melt processing. Using carboxylation-amidation reaction, short chains poly(ethylene glycol) (PEG) can be first grafted on the surface of the nanocrystals, and immobilize long PEO chains on modified nanocrystals through physical adsorption and entanglement. Two polymeric layers should further improve the thermal stability of CNs, and surface polymeric chains should provide significant dispersibility and compatibilization for extruded nanocomposites. Rheological analysis showed better PEO adsorption for PEG-grafted nanocrystals than pristine CN. Results from AFM and SEM revealed homogeneous dispersion and good compatibility of modified nanocrystals in PS matrix."
According to the news editors, the research concluded: "Finally, the thermal, mechanical, and barrier properties of ensuing nanocomposites have been investigated to study the effect of physically and/or chemically modified nanocrystals."
For more information on this research see: Physical and/or Chemical Compatibilization of Extruded Cellulose Nanocrystal Reinforced Polystyrene Nanocomposites. Macromolecules, 2013;46(14):5570-5583. Macromolecules can be contacted at: Amer Chemical Soc, 1155 16TH St, NW, Washington, DC 20036, USA. (American Chemical Society - www.acs.org; Macromolecules - www.pubs.acs.org/journal/mamobx)
Our news journalists report that additional information may be obtained by contacting N. Lin, Grenoble Inst Technol Grenoble INP, Int Sch Paper Print Media & Biomat Pagora, F-38402 St Martin Dheres, France (see also Nanocomposites).
Keywords for this news article include: France, Europe, Nanocrystal, Polystyrenes, Nanotechnology, St. Martin Dheres, Benzene Derivatives, Benzylidene Compounds, Emerging Technologies
Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2013, NewsRx LLC