Abstract
Octa-arms star-shaped polysulfides poly(PPS(n)-BCA[8]core) (n=5, 10, 15, 20, 30, 40, 50, 60, and 70) with high refractive-index were synthesized by the radiating from p-t-butylcalix[8]arene derivative as a core. The continuous insertion reaction of 3-phenoxypropyrenesulfide (PPS) into thioester moieties of BCA[8]-core was perfomerd in the presence of TBAC as a catalyst to afford the star-shaped polymers poly(PPS(n)-BCA[8]core) quantitatively. The arm-lengths of poly(PPS(n)-BCA[8]core) were controlled by the feed ratios of [PPS]/[(BCA[8]-core) × 8]. The refractive-indices values (nDs) of poly(PPS(n)-BCA[8]core) increased with their sulfur contents. Furthermore, we examined the nDs of the linear polymers poly(PPS(n)-Bphe) which skeletons are almost the same as the star-shaped polymers poly(PPS(n)-BCA[8]core). It was found that nDs of star-shaped polymer were higher than those of linear ones due to their compact structures and high segment densities.
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Kudo, H., Inoue, H., Nishikubo, T. et al. Syntheses and Refractive-Indices Properties of Novel Octa-Arms Star-Shaped Polysulfides Radiating from p-t-Butylcalix[8]arene Core. Polym J 38, 289–297 (2006). https://doi.org/10.1295/polymj.38.289
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DOI: https://doi.org/10.1295/polymj.38.289
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