Fluorescent performance of electrospun polyimide web mixed with hemicyanine dye

Polyamic acid (PAA) solution in N,N-dimethylacetamide was mixed with one hemicyanine dye. DHEASPI-C-1. to prepare the fluorescent polyimide (PI) web by electrospinning process (ESP). Firstly. dark orange-red PAA/DHEASPI-C-1 web consisted of nanofibers about 10-100 nm, could be achieved using ESP at room temperature. Then thermal imidization for 4 h in vacuum oven (200 degrees C, 133 Pa) led to the cycloimidization of PAA into PI and the orange PI/DHEASPI-C-1 fluorescent web was successfully obtained. The single-photon emission fluorescent measurements showed that both electrospun PAA/DHEASPI-C-1 web and PI/DHEASPI-C-1 web had obvious fluorescent properties. moreover. their spectra peak locations were 604 nm and 602 nm respectively. (C) 2009 Elsevier B.V. All rights reserved.