Polycyclotrimerization of Dinitriles: A New Polymerization Route for the Construction of Soluble Nitrogen-Rich Polytriazines with Hyperbranched Structures and Functional Properties
| Autor: | Cathy Ka Wai Jim, Jacky Wing Yip Lam, Herman H. Y. Sung, Ben Zhong Tang, Carrie Yin Kwan Chan, Ian D. Williams |
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| Rok vydání: | 2013 |
| Předmět: |
chemistry.chemical_classification
Materials science Polymers and Plastics Organic Chemistry Polymer Branching (polymer chemistry) Catalysis Inorganic Chemistry Soluble nitrogen chemistry.chemical_compound chemistry Polymerization Polymer chemistry Materials Chemistry Refractive index Polymer thin films Triazine |
| Zdroj: | Macromolecules. 46:9494-9506 |
| ISSN: | 1520-5835 0024-9297 |
| DOI: | 10.1021/ma402066k |
| Popis: | A new synthetic route to nitrogen-rich hyperbranched polymers is developed. The polycyclotrimerizations of dinitriles [NC–C6H4–O(CH2)4O–C6H4–CN and NC–C6H4–O(CH2)4O–Ar–O(CH2)4O–C6H4–CN Ar = isopropylidenebis(1,4-phenylene), 9,9-fluorenylenebis(1,4-phenylene) and 1,2-diphenylethenylenebis(1,4-phenylene)] catalyzed by trifluoromethanesulfonic acid proceed smoothly in 1,2-dichlorobenzene at room temperature, affording hyperbranched poly(triazine)s with high degree of branching (DB ∼63%) in high yields (up to 74.7%). All the polymers are soluble and film-forming. The polymers are thermally and morphologically stable, showing high thermal-degradation and glass-transition temperatures up to 363 and 126.5 °C, respectively. They are optically transparent, allowing almost all visible and IR lights to transmit through. The polymer thin films show high refractive indices (n = 1.7456–1.5857) in a wide spectral region (400–1600 nm) as well as high Abbe numbers (νD′ up to 187.4) and low optical dispersions (D′ down to ... |
| Databáze: | OpenAIRE |
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