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| - Rigid-Rod-Like Main Chain Polymers with Rigidly AttachedChromophores. A Novel Structural Concept for ElectroopticalMaterials. 1. Synthesis and Characterization
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| - A structural concept for nonlinear optical (NLO) polymericmaterials optimized for long-term stability of the polar order is presented: rigid-rod-like mainchain polymers furnished with longalkyl side chains with a portion of the side chains being replaced byNLO-active chromophores weresynthesized. The chromophores are rigidly attached to the mainchains, normal to the direction of thepolymer backbone. In this particular geometry the motion of theNLO-active chromophores is restrictedto a two-dimensional rotation around the stiff main chain. X-raydiffraction experiments on spin-castfilms of the polymers show a lamellar structure with a preferentialorientation of the layers parallel tothe substrate plane. The incompatibility of polar main chains andnonpolar side chains leads to thismicrophase segregation. This layered structure improves the longterm stability of polar order in thepoled polymer film. Dielectric spectroscopy revealed only onerelaxation process of large dielectric strength.The Arrhenius-type temperature dependence of relaxation timesindicates a locally activated motion ofthe chromophores.
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