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https://doi.org/10.1039/c7ra08499d
Title: | Polyfluorenylacetylene for near-infrared laser protection: Polymer synthesis, optical limiting mechanism and relationship between molecular structure and properties | Authors: | Zhao, G Feng, Y Guang, S Xu, H Lin, N Liu, X |
Keywords: | Chromophores Fourier transform infrared spectroscopy Infrared devices Infrared lasers Luminescence of organic solids Polyacetylenes Thallium alloys Two photon processes Electron delocalization Functional polyacetylenes Near-infrared lasers Optical limiting properties Structure and properties Structures and properties Terminal electron acceptors Two photon absorption Optical properties |
Issue Date: | 2017 | Citation: | Zhao, G, Feng, Y, Guang, S, Xu, H, Lin, N, Liu, X (2017). Polyfluorenylacetylene for near-infrared laser protection: Polymer synthesis, optical limiting mechanism and relationship between molecular structure and properties. RSC Advances 7 (85) : 53785-53796. ScholarBank@NUS Repository. https://doi.org/10.1039/c7ra08499d | Abstract: | A series of functional polyacetylenes bearing the fluorene moiety with different conjugated lengths and terminal substituents, poly[2-ethynyl-7-(4-nitrostyryl)-9,9-dioctyl-9H-fluorene] (P1), poly[2-ethynyl-7-(4-(4-nitrostyryl)styryl)-9,9-dioctyl-9H-fluorene] (P2), poly[2-ethynyl-7-(4-(4-methoxystyryl)styryl)-9,9-dioctyl-9H-fluorene] (P3), poly[2-ethynyl-7-(4-(4-methylstyryl)styryl)-9,9-dioctyl-9H-fluorene] (P4), and poly[2-ethynyl-7-(4-(4-methylstyryl)styryl)-9,9-didodecyl-9H-fluorene] (P5), were designed and prepared using [Rh(nbd)Cl]2 as the catalyst. Their structures and properties were characterized and evaluated by FTIR, NMR, UV, FL, GPC and TGA analyses. The optical limiting properties were investigated using 450 fs laser pulses at 780 nm. These results show that the incorporation of styryl/stilbene functionalized polyfluorenylacetylenes has endowed resultant polyacetylenes with novel near-infrared laser protection properties and enhanced thermal stability. The optical limiting mechanism for laser protection was studied. It was found that the optical limiting properties mainly originated from two-photon absorption (TPA) of molecules in the resulting polyacetylenes. Additionally, it was also found that the functionalized polyacetylene with a longer fluorene-based conjugated chromophore and a stronger terminal electron acceptor group exhibits better optical limiting properties because of the larger ?-electron delocalization and dipolar effect. © 2017 The Royal Society of Chemistry. | Source Title: | RSC Advances | URI: | https://scholarbank.nus.edu.sg/handle/10635/173955 | ISSN: | 20462069 | DOI: | 10.1039/c7ra08499d |
Appears in Collections: | Staff Publications Elements |
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