Citation: Dong-lian Zhang, Ju-xin He, Xue-hong Zhou, Nan Zheng, Lin-lin Liu, Zeng-qi Xie, Yu-guang Ma. Solvent-induced Conjugated Polymer Coils and Reversible Supramolecular Gels in Polyphenylene Ethylene Derivatives[J]. Acta Polymerica Sinica, ;2019, 50(12): 1280-1289. doi: 10.11777/j.issn1000-3304.2019.19103 shu

Solvent-induced Conjugated Polymer Coils and Reversible Supramolecular Gels in Polyphenylene Ethylene Derivatives

Institute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou 510640

Corresponding author: Nan Zheng, zhengn@scut.edu.cn Lin-lin Liu, msliull@scut.edu.cn
Received Date: 17 May 2019
Revised Date: 7 June 2019

Good solubility is the premise in solution processing of conjugated polymers while strong π-π interaction in the main chain is generally the main cause for bad dissolution. In this paper, our strategy is intruducing the auxiliary solvent and repeat unit with the similar structure as solvent in the main chain for good solubility of conjugated polymer. Based on the well dissolution between the auxiliary solvent and polymer repeat units induce a quasi-single polymer chain and advanced self-assembly, conjugated polymer coils and reversible supramolecular gels were acheived. R-limonene was added into chlorobenzene as the auxiliary solvent for the well solubility of poly(2-(4-(3',7'-dimethyloctylo-xyphenyl)-1,4-pheny-lene-vinylene (P-PPV). Atomic force microscopy (AFM) images of the spin-coated films with solutions of low concentration showed the isolated P-PPV polymer coils and the fine structure inside the coils in chlorobenzene/R-limonene mixture; while with the absence of R-limonene, the packing of sub-polymer chain was clearly observed. In concentrated solution, P-PPV formed a reversible supramolecular gel at the concentration of 2 mg mL⁻¹ with good temperature response characteristics in chlorobenzene/R-limonene mixture, and the gel temperature of P-PPV is in the range of 55 °C to −35 °C. Aggregations with different curvatures were obtained in different solvents, which made us further understand the pliability of conjugated polymer. P-PPV molecular chains were dissolved by the enhanced solubility of alkyl sidechain and phenylene ethylene, that made it became pliable and then entangled, which allowed the assembly of polymer coils with high curvature and supramolecular gel with high ratio of solvent wrap. The fluorescence quantum yield and fluorescence lifetime were both improved in conjugated polymer coils and reversible supramolecular gels, but the physical cross-linking points by π-π interaction showed low energy level as those of charge trap sites, where the mobility became lower. In the organic light emitting diodes (OLED), the uniform physical cross-linking network made the structure of P-PPV more stable and could effectively improve the stability, brightness, and lifetime of the device.
- Gel,
- Conjugated polymer,
- Polymer light-emitting diode,
- Chain entanglement
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沈阳化工大学材料科学与工程学院沈阳 110142

Solvent-induced Conjugated Polymer Coils and Reversible Supramolecular Gels in Polyphenylene Ethylene Derivatives

南开大学师唯/华北电力大学（保定）刘景维：二维配位聚合物中有序的亲锂冠醚位点用于无枝晶锂沉积

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通讯作者: 陈斌, bchen63@163.com