Journal
JOURNAL OF POLYMER SCIENCE
Volume 59, Issue 20, Pages 2265-2283Publisher
WILEY
DOI: 10.1002/pol.20210316
Keywords
alkoxysilanes; high-refractive index; optical polymers; polycondensation; polysiloxanes; thermal stability
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Funding
- German Science Foundation [INST 256/506-1]
- Universitat des Saarlandes
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Novel polysiloxanes with high refractive index based on phenanthrenyl-substituted monomers have been successfully synthesized, showing excellent optical properties and thermal stability for optoelectronic applications. The properties of the polysiloxanes can be systematically varied by changing the substitution patterns on the Si atom during the polycondensation reaction.
Polysiloxanes are an important class of polymers for optoelectronic applications. Novel polysiloxanes with high-refractive index (RI) based on phenanthrenyl-substituted monomers are prepared by a polycondensation reaction starting from various substituted dialkoxysilanes as monomers. The substitution patterns on the Si atom are systematically changed to vary the properties of the linear polymers as well as the final cured material. The two monomers with polycyclic aromatic side groups 9-phenanthrenylmethyldimethoxysilane and 9-phenanthrenylphenyldimethoxysilane are synthesized and fully characterized, including their single crystal X-ray structures. Linear polysiloxanes with variations in hydride, methyl, vinyl, phenyl, and phenanthrenyl side group content are prepared by acid- and base-catalyzed polycondensation reactions. Both Si-H and Si vinyl substituted polymers with molecular weights up to 30 kDa and adjustable RI's from 1.52 to 1.63 are obtained and the thermally cured by Pt-catalyzed hydrosilylation reactions. Polysiloxane resins are obtained with high-RI's, optical transmittance above 95% and thermal stabilities up to 420 degrees C. Long-term thermal stability tests show transmittance values above 85% even after 60 days of thermal treatment at 180 degrees C.
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