Cycloaliphatic–aromatic polyimides based on diamines with azobenzene unit

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• 作者：Ewa Schab-Balcerzak ; Lukasz Grobelny ; Anna Sobolewska and Andrzej Miniewicz
• 关键词：Holographic grating recording ; Azobenzene ; Polyimides ; Alicyclic dianhydride
• 刊名：European Polymer Journal
• 出版年：2006
• 出版时间：October 2006
• 年：2006
• 卷：42
• 期：10
• 页码：2859-2871
• 全文大小：298 K

文摘

A new family of functionalized semiaromatic polyimides has been developed. Cycloaliphatic–aromatic polyimides, derived from the polycondensation of 1,2,3,4-cyclopentanetetracarboxylic dianhydride (CPDA) with various diamines bearing azobenzene group, have been prepared and characterized. Molecular structural characterization for the resulting polymers has been achieved by ¹³C NMR, ¹H NMR, FTIR and UV–visible spectroscopies. Light-induced optical anisotropy, in novel azobenzene functionalized polyimides, has been studied by holographic polarization grating recording performed at 514.5 nm line of Ar⁺ laser. Two-wave mixing technique has been employed to inscribe the gratings in these polymers. Formation of gratings has been investigated with two s–s and s–p polarized writing beams. The kinetics of grating recording observed within the studied polymers is discussed in relation to their structure.