Synthesis and Characterization of Poly(Propylene Imine)-Based Liquid Crystalline Dendrimers
| Autor: | Mitsuru Ueda, Koichiro Yonetake, Ritsuko Nagahata, Takashi Morishita, Kazuhiro Suzuki |
|---|---|
| Rok vydání: | 1998 |
| Předmět: |
Materials science
Polymers and Plastics Hydrogen Organic Chemistry chemistry.chemical_element 02 engineering and technology 021001 nanoscience & nanotechnology Phosphonate Thermotropic crystal Characterization (materials science) chemistry.chemical_compound 020401 chemical engineering chemistry Elemental analysis Dendrimer Polymer chemistry Lyotropic Materials Chemistry Proton NMR 0204 chemical engineering 0210 nano-technology |
| Zdroj: | High Performance Polymers. 10:373-382 |
| ISSN: | 1361-6412 0954-0083 |
| Popis: | Poly(propylene imine)-based liquid crystalline dendrimers (PPILCDs) with a relatively flexible dendritic scaffold were successfully synthesized by reaction of poly(propylene imine) dendrimers with 4′-cyanobiphenyl hydrogen glutarate in the presence of condensing agent, diphenyl(2,3-dihydro-2-thioxo-3-benzoxazolyl)phosphonate. The structures of PPILCDs were characterized by IR, 1H NMR and MALDI-TOF mass spectroscopies and elemental analysis. These LCDs did not show a thermotropic liquid crystalline nature, but exhibited the liquid crystalline textures in the samples sheared at 70 °C. Furthermore, they showed a lyotropic liquid crystalline property in the 80 wt% DMF solutions. |
| Databáze: | OpenAIRE |
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