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8666 Results for "polymers"
Radical polymer breaks conductivity record
—Radical polymer breaks conductivity record “Nonconjugated polymer with pendant radicals conducts electricity as well as conjugated polymers, thanks to interlaced network” Chemical engineers at Purdue University reported the highest conductivity for an organic radical polymer to date. Unlike conjugated polymers, which shuttle charge through delocalized bonds in their backbones, nonconjugated radical polymers move charge between localized radical sites that dangle like pendants from the polymer backbone. As a result, radical polymers typically are less conductive than their conjugated cousins. At the meeting, a team led by Bryan W. Boudouris and Brett M. Savoie described a nonconjugated radical polymer that possesses electrical conductivity on par with conjugated polymers and could therefore have applications in displays or batteries.
by Bethany Halford | March 26, 2018
Backbone rearrangement transforms polyesters into vinyl polymers
—Backbone rearrangement transforms polyesters into vinyl polymers “Strategy for changing a polymer’s main chain could be used to upcycle plastics” Chemists have many ways to tweak a polymer’s periphery, but they only have a few reactions that will alter a polymer’s backbone. Seeking a strategy to modify a polymer’s main chain, Rachael A.
by Bethany Halford | December 04, 2021
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Bold Territory For Polymers
—Bold Territory For Polymers “Materials Science: Chemists push the bounds of what’s structurally possible in polymer architectures” Polymer structures have traditionally been relatively simple, usually a linear chain made from a single type of monomer or perhaps a copolymer chain made from two or three types of monomers. Sometimes chemists might graft a side chain onto the polymer or cross-link the chains to form polymer networks. But that old simplicity is falling by the wayside. Advances in polymer synthetic techniques that allow better control over the size and shape of polymers are allowing researchers to think more like architects to dream up exotic new polymer designs.
by Stephen K. Ritter | March 15, 2013
Siloxane Polymer Stretches Record
—Siloxane Polymer Stretches Record “Polymer Chemistry: New elastomer can elongate by nearly 5,000%” The Pennsylvania-based materials supplier Gelest has created a siloxane polymer that is so stretchy, 2 yards of the material could extend across the length of a football field. Jonathan Goff, manager of polymer development at Gelest, publicly unveiled the new material this month at the ACS national meeting in Boston. The polymer achieves almost 5,000% elongation before breaking, which is roughly 10 times the stretch achieved by current commercial siloxane polymers, materials that are useful in medical implants, flexible electronics, and microfluidic chips. Gelest plans to sell the polymer before the end of the year, but the elastomer still harbors a mystery.
by Matt Davenport | August 31, 2015
Chemists Build Synthetic Polymers From A DNA Blueprint
—Chemists Build Synthetic Polymers From A DNA Blueprint “Technique precisely controls polymer sequence and structure, and it doesn’t require enzymes” Synthetic polymers make great sensors or self-healing materials, but biological polymers such as proteins have an advantage—the ability to evolve. Chemists would like to evolve synthetic polymers with new applications in the same way nature evolves proteins.
by Carmen Drahl | March 04, 2013
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Programming Polymers With Solvent And Heat
—Programming Polymers With Solvent And Heat “Stimuli-responsive polymer applications could be useful for chromatography and biosensing” A polymer that changes its characteristics depending on whether it’s heated in a polar or nonpolar solvent can retain the programmed properties when it’s cooled and the solvent is removed, reports a group led by Ken D.
by Jyllian N. Kemsley | August 31, 2009
Iodinated Polymers Visible To X-Rays
—Iodinated Polymers Visible To X-Rays “” A new class of iodinated polymers may provide a way to monitor medical implants and drug delivery devices in the body. The iodine in these polymers makes them opaque to X-rays (radiopaque) and thereby visible in X-ray images. Previous attempts to make radiopaque polymers have involved incorporating iodine into nondegradable or slowly degrading polymers.
May 26, 2008
Solvay buys polymer firm ...
—Solvay buys polymer firm ... “” Solvay has agreed to buy Mississippi Polymer Technologies, developer of the Parmax family of thermoplastic polyphenylene polymers. Solvay says MPT's polymers are transparent amorphous materials that offer "a remarkable and unique combination" of strength, stiffness, and hardness. Their chemical resistance, the firm says, is better than that of any other transparent polymer. The deal follows Solvay's recent agreement to purchase the polymer division of India's Gharda Chemicals, maker of polyether ether ketone polymers. /articles/84/i3/Solvay-buys-polymer-firm.html 20060116 Concentrates 84 3 /magazine/84/8403.html Solvay buys polymer firm ... con bus materials Solvay buys polymer firm ... Chemical & Engineering News Solvay buys polymer firm ... Solvay buys polymer firm ...
January 16, 2006