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|標題:||Preparation and characterization of all organic NLO sol-gel materials based on amino azobenzene dyes|
|期刊/報告no：:||Macromolecular Chemistry and Physics, Volume 201, Issue 17, Page(s) 2336-2347.|
|摘要:||A series of NLO active chromophores based on amino azobenzene dyes have been synthesized by diazotization reaction. All organic NLO-active materials were obtained by introducing the chromophores into (hydroxymethyl)-benzoguanamine (HMBG) systems by a sol-gel process. All the sol-gel materials exhibit excellent optical transparency. Morphology, thermal and optical properties of these polymers have been characterized. These NLO-active polymers can be classified into reactive systems and guest-host systems. In the reactive systems, the chromophores were condensed with HMBG in the sol-gel process. In the guest-host systems, the nonreactive chromophores were simply doped into HMBG matrix. A second harmonic coefficient, d(33), of 23.2 pm/V has been obtained. Moreover, a systematic investigation of variation of chromophoric chemical structures on NLO properties has been investigated. Covalent bonding effect between chromophore and benzoguanamine as well as steric effect are shown to greatly enhance the temporal stability for these NLO-active sol-gel systems.|
|Appears in Collections:||化學工程學系所|
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