The thioether spacer in liquid crystalline polysiloxanes with cyano- and nitrobiphenyl mesogens
| Autor: | Jean Claude Milano, Jean-Louis Vernet, Bernard Gallot, Jean Michel Robert |
|---|---|
| Rok vydání: | 1999 |
| Předmět: |
Allylic rearrangement
Polymers and Plastics Chemistry Hydrosilylation Liquid crystalline Organic Chemistry Mesophase chemistry.chemical_element Condensed Matter Physics Grafting Sulfur law.invention chemistry.chemical_compound Thioether law Polymer chemistry Materials Chemistry Physical and Theoretical Chemistry Crystallization |
| Zdroj: | Macromolecular Chemistry and Physics. 200:1580-1586 |
| ISSN: | 1521-3935 1022-1352 |
| DOI: | 10.1002/(sici)1521-3935(19990701)200:7<1580::aid-macp1580>3.0.co;2-a |
| Popis: | Six new side-chain liquid crystalline polysiloxanes with thioether type spacers bearing cyanobiphenyl or nitrobiphenyl moieties at the termini were prepared by hydrosilylation of α-thioether groups containing olefins in the presence of hexachloroplatinic acid. The rates of grafting are higher than 90% on condition that the α-olefin does not contain sulfur atoms in allylic position. All the obtained polysiloxanes present the SmAd mesophase. Sulfur permits one to obtain long spacers without resulting in of crystallization. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Plný text