Bleaching effect of high refractive index xylylic poly(thiourea)s with “de-conjugated” polarizable hydrogen bonds

Abstract

Poly(p-xylylene thiourea) (pX-PTU) exhibits high visible-light transparency (%T ≧ 99), a high refractive index (n_D = 1.71), and a reasonable Abbe number (ν_D = 26) owing to “de-conjugated” hydrogen bonds, which inhibit orbital interactions between the polarizable phenylene and thiourea units through sandwiched methylene spacers. Upon blending pX-PTU with all-aromatic poly(thiourea)s, their refractive index increased up to n_D = 1.80.