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Data from Grenoble Institute of Technology Advance Knowledge in Styrenes (Viscoelastic Leveling of Annealed Thin Polystyrene Films)

July 21, 2014

By a News Reporter-Staff News Editor at Nanotechnology Business Journal -- Data detailed on Styrenes have been presented. According to news reporting out of St. Martin Dheres, France, by VerticalNews editors, research stated, "Theoretical and experimental work on nanoscale viscoelastic flows of polystyrene melts is presented. The reflow above the glass transition temperature (T-g) of a continuous patterned film is characterized."

Our news journalists obtained a quote from the research from the Grenoble Institute of Technology, "Attention is paid to the topographical consequences of the flow rather than to the temporal description of the leveling of the film. In the framework of capillary wave theory, it is shown that only the shortest spatial wavelengths of the topography exhibit an elastic behavior, while long waves follow a viscous decay. The threshold wavelength depends on the surface tension, on the elastic plateau modulus, and, for ultrathin films, on the film thickness. Besides, for polystyrene, this threshold is a nanoscale parameter and weakly depends on the temperature of annealing. Experiments are conducted on polystyrene 130 kg/mol submicrometer films."

According to the news editors, the research concluded: "The samples are embossed using thermal nanoimprint technology and then annealed at different temperatures between T-g + 10 degrees C and T-g + 50 degrees C. The smoothed topographies of the films are measured by atomic force microscopy and compared to a single-mode Maxwell leveling model and a more elaborated model based on reptation theory."

For more information on this research see: Viscoelastic Leveling of Annealed Thin Polystyrene Films. Langmuir, 2014;30(23):6963-6969. Langmuir can be contacted at: Amer Chemical Soc, 1155 16TH St, NW, Washington, DC 20036, USA. (American Chemical Society -; Langmuir -

Our news journalists report that additional information may be obtained by contacting E. Rognin, Grenoble Inst Technol, SIMAP EPM, F-38400 St Martin Dheres, France. Additional authors for this research include S. Landis and L. Davoust.

Keywords for this news article include: France, Europe, Nanoscale, Polystyrenes, Nanotechnology, St. Martin Dheres, Benzene Derivatives, Benzylidene Compounds, Emerging Technologies

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Source: Nanotechnology Business Journal

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