Controlling the twist of a polymer backbone has enabled US chemists to tune the polymer's optical and electronic properties.John Reynolds and colleagues at the University of Florida,took poly(3,4-propylenedioxythiophene)(ProDOT),and connected its monomers together into small loops.Usually polymers are made of a string of monomers that can rotate freely.Adding extra tethers between monomers holds them in place and reduces their freedom to move,said Reynolds.
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