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	Fabrication of photoresponsive electrostatic multilayers containing diazonium-hyperbranched azo polymer
	Zhang Haoyu ; He Yaning ; Li Yujing ; Wang Xiaogong
	2010-05-07 ; 2010-05-07
关键词	electrostatic self-assembly hyperbranched photoresponsive azo polymer CATIONIC BIPOLAR AMPHIPHILES SELF-ASSEMBLY PROCESS COUPLING REACTION CONSECUTIVE ADSORPTION CHARGED SURFACES POLYELECTROLYTES FILMS BEHAVIOR POLYCATIONS DIAZORESIN Polymer Science
中文摘要	A novel hyperbranced azo polymer with terminal diazonium groups was synthesized by step-growth polymerization of 4,4'-diamino diphenyl sulphone's diazonium salts (A(2)) and benzene-1,3,5-triearboxylic acid tri2-(N-ethylanilino) ethyl ester (B-3) through azo-coupling reaction. 4, 4'-diamino diphenyl sulphone (0.248 g, I mmol) was dissolved in a hot homogeneous mixture of glacial acetic acid (7.5 mL) and sulfuric acid ( I mL). Aqueous solution of sodium nitrite (0.166 g, 2.4 mmol) in 0.5 mL water was added dropwise into the solution at 0 degrees C and kept at this temperature for 5 min. The diazonium salt solution of 4,4'-diamino diphenyl sulphone was then added dropwise into the solution of benzene-1, 3, 5-tricarboxylic acid tri-2-( N-ethylanilino) ethyl ester (0.326 g, 0.5 mmol) in 50 mL DMF at 0 degrees C. After the reaction was carried out at 0 degrees C for 8 h, the solution containing the diazonium-hyperbranched azo polymer was directly used as the polyeation solution. The purchased sodium polystrene sulfonate (PSSA) was used as polyanion. Then the multilayer films were prepared by an electrostatic layer-by-layer deposition method. The self-assembly processes and morphologies of surfaces were characterized by UV-Vis spectra, ellipsometer and AFM. A linear increase of absorbance and thickness was observed as the number of the bilayers increased. Dichroism was optically induced in the self-assembly film under the irradiation of a polarized Ar+ laser beam at 488 nm. After 15 min irradiation of the laser beam at an intensity of 80 mW/cm(2) the orientation order parameter of the multilayer film obtained was about 0.02. With interfering illumination of Ar+ laser beams for 30 min, significant surface relief gratings formed on the self-assembly multilayer film were observed. The spatial period and height of the obtained SRGs were about 744 nm and 20 nm. respectively.
语种	中文 ; 中文
出版者	SCIENCE CHINA PRESS ; BEIJING ; 16 DONGHUANGCHENGGEN NORTH ST, BEIJING 100717, PEOPLES R CHINA
内容类型	期刊论文
源URL	[http://hdl.handle.net/123456789/17225]
专题	清华大学
推荐引用方式 GB/T 7714	Zhang Haoyu,He Yaning,Li Yujing,et al. Fabrication of photoresponsive electrostatic multilayers containing diazonium-hyperbranched azo polymer[J],2010, 2010.
APA	Zhang Haoyu,He Yaning,Li Yujing,&Wang Xiaogong.(2010).Fabrication of photoresponsive electrostatic multilayers containing diazonium-hyperbranched azo polymer..
MLA	Zhang Haoyu,et al."Fabrication of photoresponsive electrostatic multilayers containing diazonium-hyperbranched azo polymer".(2010).

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