Bitte benutzen Sie diese Referenz, um auf diese Ressource zu verweisen:
Volltext verfügbar? / Dokumentlieferung
doi:10.22028/D291-37148
Titel: | High-Refractive-Index Polysiloxanes Containing Naphthyl and Phenanthrenyl Groups and Their Thermally Cross-Linked Resins |
VerfasserIn: | Briesenick, Max Florian Gallei, Markus Kickelbick, Guido |
Sprache: | Englisch |
Titel: | Macromolecules : a publication of the American Chemical Society |
Bandnummer: | 55 |
Heft: | 11 |
Startseite: | 4675 |
Endseite: | 4691 |
Verlag/Plattform: | ACS |
Erscheinungsjahr: | 2022 |
DDC-Sachgruppe: | 540 Chemie |
Dokumenttyp: | Journalartikel / Zeitschriftenartikel |
Abstract: | High-refractive-index polysiloxanes containing naphthyl, phenanthrenyl, phenyl, and methyl groups have been synthesized using a polycondensation reaction starting from substituted di- and trialkoxysilanes. The obtained polymers comprised linear siloxane and partially cross-linked silsesquioxane units and showed optical transparencies of up to 99% at a thickness around 120 μm and high refractive indices of up to 1.622. The polymeric structures contained stabilized silanol groups that were further cross-linked at increased temperatures of 200 °C resulting in the formation of hybrid inorganic–organic resins. These typical thermal treatments at 200 °C for 72 h kept the transparencies as high as 98% and slightly lowered the RIs to values up to 1.610. A detailed structure evaluation of the resulting systems showed, depending on the size of the polycyclic aromatic substituent, excimer formation, which is based on weak interactions of the aromatic groups in the polymeric material. After thermal consolidation, glass-transition temperatures of the cross-linked systems were in the range of 18–74 °C depending on the composition. Thermal stabilities of the final resins reached higher values than commonly used siloxane resins up to 470 °C. The final materials are potential resins for high-temperature optical applications. |
DOI der Erstveröffentlichung: | 10.1021/acs.macromol.2c00265 |
URL der Erstveröffentlichung: | https://pubs.acs.org/doi/10.1021/acs.macromol.2c00265 |
Link zu diesem Datensatz: | urn:nbn:de:bsz:291--ds-371485 hdl:20.500.11880/33712 http://dx.doi.org/10.22028/D291-37148 |
ISSN: | 1520-5835 0024-9297 |
Datum des Eintrags: | 2-Sep-2022 |
Fakultät: | NT - Naturwissenschaftlich- Technische Fakultät |
Fachrichtung: | NT - Chemie |
Professur: | NT - Prof. Dr. Markus Gallei NT - Prof. Dr. Guido Kickelbick |
Sammlung: | SciDok - Der Wissenschaftsserver der Universität des Saarlandes |
Dateien zu diesem Datensatz:
Es gibt keine Dateien zu dieser Ressource.
Alle Ressourcen in diesem Repository sind urheberrechtlich geschützt.