Synthesis and Characterization of High Refractive Index Polythiocyanurates

The polythiocyanurates with high molecular weights were successfully prepared by the phase-transfer catalyzed polycondensation of triazinedithiol with activated dibromides. These polymers were soluble in tetrahydrofuran (THF) and N-methyl-2-pyrrolidone (NMP), and readily afforded colorless and trans...

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Bibliographic Details
Published in:Journal of Photopolymer Science and Technology 2021/06/11, Vol.34(3), pp.251-254
Main Authors: Shi, Songyan, Onodera, Yoshihisa, Tsukamono, Tadashi, Shibasaki, Yuji, Oishi, Yoshiyuki
Format: Article
Language:English
Subjects:
High refractive index
Low birefringence
Polythiocyanurate
Thermoplasticity
Triazinedithiol
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Summary:The polythiocyanurates with high molecular weights were successfully prepared by the phase-transfer catalyzed polycondensation of triazinedithiol with activated dibromides. These polymers were soluble in tetrahydrofuran (THF) and N-methyl-2-pyrrolidone (NMP), and readily afforded colorless and transparent cast films. The films of polythiocyanurates exhibited good thermal stabilities such as thermal decomposition temperatures of 320 ˚C in air. A relatively high glass transition temperatures of the polymers were in the range of 112-143 ˚C. The optical transmittance of the films was as high as 80% at 400 nm. The films exhibited high refractive index of 1.73 at d line, which is attributed to the triazine rings and sulfur atoms, and Abbe's number of around 18. Furthermore, the films showed the low birefringence of 0.0007-0.0022 at d-line. The obtained polymers are promising candidates for thermoplastic optical lens application.
ISSN:0914-9244
1349-6336
DOI:10.2494/photopolymer.34.251