New Conjugated Poly(aryleneethynylenes) with Main-Chain Photochromic Unitsстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:New photochromic poly(aryleneethynylenes) have been synthesized on the basis of dibromod-ithienylmaleimide and bisacetylenes under the conditions of the Sonogashira reaction. Molecular masses and polydispersities of the poly(arylene ethynylenes) vary over the following ranges: M(w) = 19 150-32 650, M(n) = 12 000-19 200, and M(w)/M(n) = 1.47-1.70; the glass-transition temperatures are in the range 208-230 degrees C; and the 10% weight-loss temperatures in air and argon are in the ranges 330-370 and 550-660 degrees C, respectively. All poly(aryleneethynylenes) exhibit photochromic properties in both solutions and films. It has been shown that, when photochromes are incorporated into a polymer matrix, the efficiency of their photoinduced coloration diminishes, irrespective of whether they are fragments of macromolecular chains or components of polymer solutions.