Organic-inorganic hybrid pigments with enhanced thermo- and photostability have been prepared by co-intercalating C.I. Acid Red 337 (AR337) and an UV absorbent (BP-4) into the interlayer of ZnAl layered double hydroxides through a co-precipitation method. The obtained compounds were characterized by XRD, FT-IR, SEM, TG-DTG-DTA, UV-vis and CIE 1976 L*a*b* color scales. The results show the successful co-intercalation of AR337 and BP-4 into the interlayer region of LDHs and reveal the presence of host-guest interactions between LDHs host layers and guest anions of AR337 and BP-4 as well as guest-guest interactions between AR337 and BP-4. The intercalation can improve the thermostability of AR337 due to the protection of LDHs layers. Moreover, the co-intercalation of AR337 and BP-4 not only markedly enhances the photostability of AR337 but also has significant influence on the color property of the hybrid pigment.
Layered double hydroxides (LDH) has wide applications as non-toxic and halogen-free flame retardant for various resins and highly efficient thermal stabilizer for halogen-containing polymers. This review will discuss some public patents and relevant papers on the flame retardancy and the thermal stability of LDH/polymer composites when the LDHs with different chemical compositions are used as the additive in the polymer matrix. We have summarized these related LDHs in two tables: one for flame retardant and the other for thermal stabilizer.
Layered double hydroxides (LDHs) have attracted a great deal of attention owing to their structural anisotropy, anion-exchange capability and compositional flexibility and have been widely investigated as catalysts, adsorbents, anion-exchangers, polymer additives, optical materials, and so on. The intercalation of chromophores into the interlayer galleries of LDHs has drawn considerable interest since it can result in a kind of functional pigments showing different photophysical and photochemical properties from the pristine chromophores due to the host-guest and guest-guest interactions. This paper reviews recent patents progress made for the synthesis and applications of LDHs based pigments. The potentional applications and the future development are also discussed.
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