Abstract
Layered zinc hydroxide salts were intercalated with anionic azo dyes, obtaining orange pigments. The materials were characterized by X-ray diffraction (XRD), Fourier Transform Infrared spectroscopy (FTIR), thermal analysis (TGA/DTA/DSC) and X-ray photoelectron spectroscopy (XPS). After characterization, the layered pigments were dispersed into a matrix of poly(vinyl alcohol) - PVA, in variable concentrations, in relation to the PVA mass. Homogeneous, transparent and colorful films were obtained by wet casting method and kept in a desiccator at 65% of humidity for one week and evaluated in relation to their mechanical properties. Owing to the different intercalated anions polarities, different behaviors were observed for both pigments when used as fillers in PVA. This work opens a research front in the utilization of layered hydroxide salt intercalated with anionic dyes, as alternative fillers in polymer composite materials.
Highlights
Alcohol) – PVA, in variable concentrations, in relation to the PVA mass
Homogeneous, transparent and colorful films were obtained by wet casting method and kept in a desiccator at 65% of humidity for one week and evaluated in relation to their mechanical properties
Owing to the different intercalated anions polarities, different behaviors were observed for both pigments when used as fillers in PVA
Summary
Dissolveu-se 4,25 mmols de cada um dos sais de sódio dos corantes em 20 mL de água destilada. Em seguida essas soluções foram separadamente misturadas com 30 mL de uma solução aquosa contendo 15 mmols de ZnCl2. O pH da mistura foi ajustado para valores próximos de 7, utilizando-se uma solução de NaOH 1 mol/L, pH em que o composto precipita. NH O) de 0,4 foi diminuída para 0,28, no intuito de formar pilastras dos ânions dos corantes e manutenção de íons hidroxila (ou íons cloreto) intercalados, o que possivelmente iria facilitar a penetração de moléculas de PVA entre as lamelas e aumentar a possibilidade de delaminação/esfoliação do material lamelar na matriz polimérica. O ZnCl e o NaOH foram fornecidos pela VETEC e utilizados sem purificação adicional
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