New bead type and high symmetrical diallyl-POSS based emissive conjugated polyfluorene

• Published in: Polymer (Guilford) Vol. 55; no. 26; pp. 6696 - 6707
• Main Authors: Huang, Jin, Wang, Weina, Gu, Jiangjiang, Li, Weizhi, Zhang, Qiuhong, Ding, Yin, Xi, Kai, Zheng, Youxuan, Jia, Xudong
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 15-12-2014; Elsevier
• Subjects: Applied sciences; Beads; Devices; Diallyl-POSS; Exact sciences and technology; Gel permeation chromatography; Inorganic and organomineral polymers; Light-emitting polymer; Micrographs; Molecular structure; Nanostructure; Physicochemistry of polymers; Polyfluorene; Preparation; Spectra; Stacking; Polyfluorene; Light-emitting polymer; Diallyl-POSS; Composite film; Two photon process; Solution polycondensation; Carbazole derivative copolymer; Fluorescence; Heck reaction; Luminescent material; Silsesquioxane copolymer; Experimental study; Quantum yield; Thermal stability; Organic solution; Conjugated copolymer; Polyhedral molecule; Morphology; Preparation; Unsaturated copolymer; Photochemical stability; Fluorene derivative copolymer
• ISSN: 0032-3861; 1873-2291
• DOI: 10.1016/j.polymer.2014.10.071

A new bead type and diallyl-POSS based polyfluorene (P2) with high symmetrical structure was synthesized via Heck coupling reaction between oligomeric alkynyl fluorene (P1) and diallyl polyhedral oligomeric silsesquioxanes (diallyl-POSS). The molecular weight and the conjugated length of P1 and P2 were well controlled to acquire good solubility and excellent optical property. The bead-type POSS based polymer was characterized by gel permeation chromatography (GPC), FT-IR, 1H NMR and photoluminescence (PL) spectra. High Resolution Transmission Electron Microscopy (HRTEM) micrographs showed that diallyl-POSS were uniformly nano-dispersed in the polymer matrix. Compared with P1, the POSS based polyfluorene P2 exhibited not only a higher thermal stability, but also an improved photophysical property in solution and solid states. The incorporation of diallyl-POSS resulted effectively in inhibiting the strong stacking/dipole–dipole interaction between fluorescent groups in the polyfluorene. The experimental results indicate that the bi-functional POSS based light-emitting polymers with high symmetrical structure can have great potential in optical materials and devices, such as OPV or PLED, etc.
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