Luminescent Iridium-containing liquid crystalline polymers in the side chain. Issue 14 (8th December 2017)

• Record Type: Journal Article
• Authors: Song, Le-Ping; Cong, Yue-Hua; Yao, Bing; Zhang, Bao-Yan
• Is Part Of: Liquid crystals. Volume 44:Issue 14/15(2017)
• Page Start: 2348
• Page End: 2354
• Publication Date: 2017-12-08
• Subjects: Graft copolymers -- luminescence -- liquid crystalline polymers (LCP) -- thermal properties; Liquid crystals -- Periodicals; 548.905
• DOI: 10.1080/02678292.2017.1359695
• Languages: English
• ISSNs: 0267-8292

Abstract

ABSTRACT: Luminescent liquid crystalline polymers consisting of Iridium attached to polysiloxanes are prepared. 4-Cyanophenyl 4-(allyloxy) benzoate (M1 ) and an Iridium complex (Ir-M2 ) grafted to poly(methylhydrogeno)siloxane are used for the preparation of the Iridium-containing liquid crystalline polymers. The chemical structures are characterised by Fourier transform infrared spectroscopy and 1 H NMR. The mesomorphic properties and phase behaviour are investigated by differential scanning calorimetry, thermogravimetric analysis, polarising optical microscopy and X-ray diffraction. The polymers containing <1.2 mol% of the Iridium ions reveal reversible mesomorphic phase transition, wide mesophase temperature ranges and high thermal stability. The introduction of the Iridium ions does not change the liquid crystalline state of polymer systems; on the contrary, the polymers are enabled with the luminescent properties. With the Iridium ion contents ranging between 0.3 and 1.2 mol%, luminescent intensity of polymers gradually increased. The temperature dependence of luminescent intensity was studied in the liquid crystalline phase. GRAPHICAL ABSTRACT: