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Authors Wei, Q. ; Pötzsch, R. ; Komber, H. ; Pospiech, D. ; Voit, B.
Title High refractive index hyperbranched polymers with different naphthalene contents prepared through thiol – Yne click reaction using di-substituted Asymmetric bulky Alkynes
Date 06.08.2014
Number 43263
Abstract In the present study, different aromatic moieties, naphthalene and benzene, were introduced into alkynes to constitute 1,3,5-tris(naphthylethynyl)benzene as B3 monomer. This monomer could be reacted with different ratios of hexane-1,6-dithiol (A2 monomer) via mono-selective Thiol-Yne reaction (TYR) to form hyperbranched polymers PI. TYR yielded in both, model reactions and polymerizations, mono-adducts with high regioselectivity and proved the absence of any bis-adducts. Polymers of very high molecular weights of up to 625,000 g/mol could be achieved without any sign of gel formation. All the polymers exhibit high transparency in the visible wavelength range and also show high refractive indices of up to 1.745 at 589.7 nm due to the high incorporation of naphthalene and phenyl groups. Besides, all polymers prove excellent solubility and processability together with excellent thermal properties.
Publisher Polymer
Identifier
Citation Polymer 55 (2014) 5600-5607
DOI https://doi.org/10.1016/j.polymer.2014.07.030
Tags thiol-yne naphthalene high refractive index hyperbranched polymer light-emitting-diodes addition polymerization radical-addition chemistry 1 4-diethynylbenzene acetylenes powerful tool

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