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|標題:||The facile synthesis and optical nonlinearity of hyperbranched polyaspartimides with azobenzene dyes||作者:||Tsai, C.C.
|關鍵字:||Azobenzene dye;Hyperbranched polymer;Michael addition reaction;Nonlinear optical;Polyaspartimides;Electro-optical coefficient;side-chain;chromophore design;thermal-stability;highly efficient;electrooptic coefficients;functional dendrimers;ab(2) monomer;polymers;polyimides;behavior||Project:||Dyes and Pigments||期刊/報告no：:||Dyes and Pigments, Volume 82, Issue 1, Page(s) 31-39.||摘要:||
A series of thermally stable nonlinear optical hyperbranched polyaspartimides were synthesized via the Michael addition reaction of a fluorine-containing trimaleimide, 1,1-tris[4-(4-maleimide-2-trifluoromethyl-phenoxy)-phenyl]ethane and two respective azobenzene dyes, namely bis(4-aminophenyl(4-(4-nitrophenyl)-diazenyl)phenyl)-amine and 2,4-diamino-4'-(4-nitrophenyl-diazenyl)-azobenzene, using p-tolue-nesulfonic acid as catalyst. The incorporation of fluorine-rich components within the hyperbranched polymers increased solubility in organic solvents and reduced optical loss. Owing to the three-dimensional, void-rich, topological structure of the highly branched polymers, the spatial separation of the dyes endows the polymers with a favorable site isolation effect, which thereby negates chromophoric aggregation. Using in situ contact poling, electro-optical coefficients, r(33) of 6.5-14.7 pm V(-1) and temporal stability at 80 degrees C were obtained. Both the dynamic thermal and temporal stabilities of the hyperbranched polyaspartimides were superior to those of their linear analogues. (c) 2008 Elsevier Ltd. All rights reserved.
|Appears in Collections:||化學工程學系所|
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