Water-soluble, antiyellowing polymeric fluorescence brighteners

摘要

In this study, a type of polymeric fluorescence brightener (PFB) with a triazine-stilbene structure was synthesized through a three-step condensation reaction, and the performance of this PFB on antiyellowing was also investigated by the whiteness of paper coated with the as-prepared PFB. Fourier transform infrared spectra revealed that the chlorine atom (Cl) was substituted by a poly(vinyl alcohol) (PVA) group ([CH2CHOH](n)). According to the UV aging experiment, the PFB not only enhanced the whiteness of the paper but also improved the anti-UV aging properties [compared to those of VBL 4-double-(6-diethanolamine-4-sulfanilic acid-1,3,5-triazine-2-amino)-stilbene-2,2-disulfonic acid sodium, a type of commonly used fluorescent whitening agent as a light stabilizer and fluorescent brightening agent]. Moreover, the results of UV-visible spectra indicated that the substitution of PVA suppressed the isomerization of trans conformers to cis conformers under UV light irradiation; this was attributed to the big space steric hindrance of PVA in the as-prepared samples being restricted the isomerization reaction. Meanwhile, the solubility of the as-prepared sample was also improved because more hydroxyl groups were introduced into the PFB with the substitution of PVA. (c) 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 45536.