Synthesis and Properties of Poly(4,8-dialkoxy-1,5-naphthalenevinylene)s |
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Authors: | Hung-Te Chang Hsun-Tsing Lee |
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Affiliation: | 1. Department of Chemical Engineering , Wufeng Institute of Technology , Chia Yi, Taiwan, ROC;2. Department of Chemical and Materials Engineering , Vanung University , Chung Li, Taiwan, ROC |
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Abstract: | Novel conjugated materials, poly(4,8-dialkoxy-1,5-naphthalenevinylene)s (OCn-PNV, n = 4, 6, 8, and 12), have been prepared by a method similar to the Gilch procedure. The structure, optical and thermal properties of these polymers with various alkoxy side chain lengths have been evaluated by IR, UV-Vis absorption, fluorescence emission and thermogravimetric analysis. The band gap of OCn-PNV increases with increasing side chain length. Moreover, wavelengths of the photoluminescence (PL) emission peaks (λmax) of OCn-PNV solutions decrease with increasing alkoxy side chain length. This is probably due to the entanglement of long side chains that causes distortion of the conjugated main chains and thereby raises band gap of the polymer. PL λmax's of these polymers in film state are red-shifted by 14–59 nm than those in solution state. The red-shift is due to the more chain aggregations after spin coating from solution into film state and consequently the lower band gap in the film state. Besides, the polymer with shorter side chains is more thermally stable than that with longer side chains. |
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Keywords: | conjugated materials poly(4,8-dialkoxy-1,5-naphthalenevinylene)s thermal properties photoluminescence |
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