Synthesis and characterization of poly(pyridinium salt)s derived from various aromatic diamines
| Autor: | Alexi K. Nedeltchev, Tae Soo Jo, Pradip K. Bhowmik, Bidyut Biswas, Haesook Han |
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| Rok vydání: | 2012 |
| Předmět: |
chemistry.chemical_classification
Polymers and Plastics Dimethyl sulfoxide Organic Chemistry Inorganic chemistry Polymer Gel permeation chromatography chemistry.chemical_compound Ultraviolet visible spectroscopy Polymerization chemistry Lyotropic Polymer chemistry Materials Chemistry Pyridinium Counterion |
| Zdroj: | Polymer. 53:1063-1071 |
| ISSN: | 0032-3861 |
| Popis: | Several poly(pyridinium salt)s containing various aromatic diamine moieties and tosylate counterions were prepared by the ring-transmutation polymerization reaction of bis(pyrylium tosylate) with aromatic diamines in dimethyl sulfoxide at 130−135 °C for 48 h and their tosylate counterions were exchanged to triflimide polymers by a metatheses reaction in an organic solvent. Their chemical structures were established by using various spectroscopic techniques. Their number-average molecular weights (Mn) were in the range of 38–46 kg/mol and polydispersities in the range of 1.13–1.43 as determined by gel permeation chromatography. They showed excellent thermal stabilities in nitrogen in the range of 326–477 °C. They exhibited lyotropic liquid-crystalline phase in polar aprotic and protic organic solvents above their critical concentrations depending on their microstructures and counterions. Their optical properties were examined by using UV–Vis and photoluminescent spectroscopy, which revealed that some polymers emitted UV light, some emitted blue light, and some emitted green light (both in solutions and solid states) depending on their microstructures, counterions, and on solvent polarity of organic solvents. |
| Databáze: | OpenAIRE |
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