Abstract
In this study, hybrid pigments based on carminic acid (CA) were synthesized and applied in polymer materials. Modification of aluminum-magnesium hydroxycarbonate (LH) with CA transformed the soluble chromophore into an organic-inorganic hybrid colorant. Secondary ion mass spectroscopy (TOF-SIMS), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), thermogravimetric analysis (TGA), scanning electron microscopy (SEM), and UV-Vis spectroscopy were used to study the structure, composition, and morphology of the insoluble LH/CA colorant. Successful modification of the LH was confirmed by the presence of interactions between the LH matrix and molecules of CA. XPS analysis corroborated the presence of CA complexes with Mg2+ ions in the LH host. The batochromic shift in UV-Vis spectra of the organic-inorganic hybrid colorant was attributed to metal-dye interactions in the organic-inorganic hybrid colorants. Strong metal-dye interactions may also be responsible for the improved solvent resistance and chromostability of the modified LH. In comparison to uncolored ethylene-norbornene copolymer (EN), a modified EN sample containing LH/CA pigment showed lower heat release rate (HRR) and reduced total heat release (THR), providing the material with enhanced flame retardancy.
Highlights
Natural and synthetic dyes are used in a wide range of everyday products [1,2]
This paper has provided a detailed description of the production and properties of organic-inorganic pigments based on carminic acid (CA)
Stabilization of CA on aluminum-magnesium hydroxycarbonate (LH) leads to pigments with an excellent resistance to acetone and water. This change may be explained by the formation of complexes between the dye molecules and magnesium ions
Summary
Natural and synthetic dyes are used in a wide range of everyday products [1,2]. Their high solubility, as well as low thermal, chemical, and photo stability, strictly limit their use to certain materials and applications. Interest has grown in new organic-inorganic colorants based on natural dyes [3,4,5,6,7,8,9]. Bywith combining natural or synthetic dyes with structures, it is possible to obtain hybrid enhanced chemical properties and inorganic a better thermal stability. Several studies have been devoted to the adsorption or intercalation of synthetic dyes based on the azo or anthraquinone chromophore into or onto layered double hydroxides [23,24,25,26,27]. Flammability of the resulting composite was investigated using the cone calorimeter test
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