High Performance Side-Chain Polyquinolines and Perfluorocyclobutane-Containing Thermoset Polymers for Electro-Optic Appl
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approach to allow the incorporation of a broader variation of NLO chromophores including highly efficient tricyanovinyl-styrylthiophene-based chromophore into PFCB polymers are reported. RESULTS AND DISCUSSION Synthesis and Characterization of NLO Polyquinolines Our present strategy for the synthesis of NLO side-chain aromatic polyquinolines involved covalently bonding the chromophore onto the pendent phenyl moieties of a preformed polyquinoline using the mild conditions of the Mitsunobu reaction[8], which allowed for preservation of the NLO chromophores (Scheme 1). This methodology yields NLO side-chain aromatic polyquinolines with a broad variety of polymer backbones and provides flexibility in selecting NLO chromophores. In addition, introducing the hydroxyl group on the pendent phenyl side group instead of the polyquinoline backbone, a higher efficiency of chromophore attachment could be achieved. It should be also noted that a phenyl spacer between the polymer backbone and the NLO chromophores facilitated the process for high electric field poling of the NLO polyquinolines compared to polyquinolines with the chromophores directly attached on the polymer backbone. DSC measurement indicated that all of the resulting NLO side-chain polyquinolines possess high glass transition temperatures (Tg>200 oC) and excellent thermal stabilities. Weight losses of 180 oC) and excellent thermal stability. Weight losses of
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