Hyperbranched polymers – tree-like molecules – are not particularly useful for the creation of plastic films and molded parts because they dont entangle. So Virginia Tech researchers have created segmented hyperbranched plastics, which do entangle and result in high-performance polymers.
Virginia Tech chemistry professor Timothy E. Long of Blacksburg will describe the configuration and functionality of the new family of polymers at the 227th Annual Meeting of the American Chemical Society, being held in Anaheim, Calif., March 28 through April 1, 2004.
"We have placed extended sequences between the branch points," said Long. "Think of elastic springs. If a trees branches were on springs, they would more easily diffuse and entangle."
Susan Trulove | EurekAlert!
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Light can be used not only to measure materials’ properties, but also to change them. Especially interesting are those cases in which the function of a material can be modified, such as its ability to conduct electricity or to store information in its magnetic state. A team led by Andrea Cavalleri from the Max Planck Institute for the Structure and Dynamics of Matter in Hamburg used terahertz frequency light pulses to transform a non-ferroelectric material into a ferroelectric one.
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Researchers at TU Graz calculate the most accurate gravity field determination of the Earth using 1.16 billion satellite measurements. This yields valuable knowledge for climate research.
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Researchers at Chalmers University of Technology, Sweden, have discovered a completely new way of capturing, amplifying and linking light to matter at the nanolevel. Using a tiny box, built from stacked atomically thin material, they have succeeded in creating a type of feedback loop in which light and matter become one. The discovery, which was recently published in Nature Nanotechnology, opens up new possibilities in the world of nanophotonics.
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