By a News Reporter-Staff News Editor at Science Letter -- Current study results on Nanoparticles have been published. According to news reporting originating in Akron, Ohio, by NewsRx journalists, research stated, "The effects of nanoparticle concentration and processing conditions on the relaxation behavior of PEN nanocomposites are investigated using mechano optical techniques where birefringence, true stress and true strain are measured while subjecting the polymer films to uniaxial deformation followed by relaxation. For this purpose, two different stretching temperatures were employed to stretch the films containing 0.5 and 2 wt % nanoparticles: one above and the other below the T-parallel to (liquid-liquid transition)."
The news reporters obtained a quote from the research from the University of Akron, "Increasing the temperature as well as the addition of nanoparticles suppresses the spontaneous deformation processes leading to sharp increase in true strain. An instantaneous stress drop is observed during relaxation below the T-parallel to corresponding to the initial glassy component observed in the stress-optical behavior during stretching. This stress is attributed to the presence of segmental rigid correlations that were not broken during the stretching stage. This behavior was found to be absent above the liquid-liquid transition as they are already melted. Nanoparticles were found to act as suppressors of crystallinity during stretching. Their presence reduces likelihood of strain crystallization as they reduce the relaxation of oriented chains into favorable registry with each other to crystallize. During relaxation, the presence of nanoparticles was found to increase the crystallinity."
According to the news reporters, the research concluded: "Their presence increases the population of oriented amorphous chains during deformation that relax into favorable registry with each other leading to increase in crystallinity."
For more information on this research see: Role of Nanoparticles and Relaxation on Strain-Induced Crystallization Behavior in Uniaxially Stretched Polyethylene Naphthalate Films: A Mechano-Optical Study. Macromolecules, 2013;46(15):6300-6308. 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 correspondents report that additional information may be obtained by contacting K. Kanuga, Univ Akron, Dept. of Polymer Engn, Akron, OH 44325, United States (see also Nanoparticles).
Keywords for this news article include: Ohio, Akron, Alkenes, Polyenes, Hydrocarbons, United States, Polyethylenes, Nanotechnology, Organic Chemicals, Emerging Technologies, North and Central America
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