Abstract
Synthesis of conductive polymer poly([thiophene]-[benzo[1,2,3]thiadiazole] [thiophene]) (abbreviated as P(T-Btdaz-T)) was achieved by electrochemical polymerization in hydroxypropyl cellulose (HPC)/N,N-dimethylformamide (DMF) in liquid crystal state. The polymer thus obtained shows fingerprint texture, which is derived from helical structure of the HPC in cholesteric liquid crystal state. Fourier transform infrared spectroscopy measurements revealed that the polymer film is P(T-Btdaz-T)/HPC composite. Circular dichroism optical absorption spectroscopy measurements show that the polymer has the optical activity. Next, electrochemical polymerization of 3,4-ethylene-dioxythiophene (EDOT) was carried out in columnar phase liquid crystal. The polymer transcribes the columnar structure and shows optical structure resembling columnar liquid crystal electrolyte solution.
Highlights
Polybenzothiadiazole is one of the most studied conductive polymers as a low-bandgap polymer for applications such as photo voltaic cells, transistors [1]-[20]
Optical texture of the polymer prepared in hydroxypropyl cellulose (HPC) liquid crystal was observed by polarizing optical microscopy (POM), Figure 3
HPC dissolved in DMF shows cholesteric liquid crystal, indicating the monomer propagated in the helical structure of the HPC during the polymerization with structural transcription mechanism to form fingerprint structure
Summary
Polybenzothiadiazole is one of the most studied conductive polymers as a low-bandgap polymer for applications such as photo voltaic cells, transistors [1]-[20]. Hydroxypropyl cellulose (HPC, cellulose derivatives) in organic solvent is employed as an electrolyte solution for electrochemical polymeriza-. HPC is dissolved in both water and organic solvents [22]-[26]. N,N-dimethylformamide (DMF) is selected as a solvent for dissolving HPC. HPC in DMF liquid crystal solution allows polymerization of organic monomers with hydrophobicity. Electrochemical synthesis of poly(3,4-ethylelnedioxythiophene) (PEDOT) is carried out in columnar liquid crystal electrolyte solution. Hexadecyltrimethylammonium chloride (HTAC) is used as a columnar liquid crystal. Columnar liquid crystal acts as a template for electrochemical polymerization
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