Polímeros: Ciência e Tecnologia
https://revistapolimeros.org.br/article/doi/10.1590/0104-1428.2220
Polímeros: Ciência e Tecnologia
Scientific & Technical Article

Nanocompósitos de poli(álcool vinílico) contendo materiais híbridos mimetizando o pigmento Azul Maya

Poly(vinyl alcohol) nanocomposites containing hybrid materials mimicking the Maya Blue pigment

Kupfer, Vicente Lira; Jaerger, Silvia; Wypych, Fernando

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Resumo

De forma a mimetizar o pigmento Azul Maya, dois corantes azo (alaranjado de metila - AM e vermelho congo - VC) foram inseridos na estrutura porosa da paligorsquita. Os materiais híbridos foram caracterizados por difração de raios X, espectroscopia de energia dispersiva, microscopia eletrônica de varredura, espectroscopia na região do ultravioleta-visível e análise superficial (área superficial por BET, tamanho e volume de poros por BJH). Após dispersar os materiais híbridos no poli(álcool vinílico), filmes coloridos e transparentes foram obtidos por casting úmido. Após acondicionamento em uma dessecador por uma semana a uma umidade controlada de 43 ± 2% os filmes foram avaliados em relação as suas propriedades mecânicas. De modo geral, o material PVA-PGS/AM teve um aumento no módulo de Young, tensão de ruptura e redução do alongamento enquanto que a paligorsquita bruta e PVA-PGS/VC apresentaram um comportamento oposto.

Palavras-chave

corante azo, materiais híbridos, propriedades mecânicas, paligorsquita, poli(álcool vinílico).

Abstract

To mimic the Maya Blue pigment, two azo dyes (methylorange - AM and congo red - VC) were inserted into the porous structure of paligorskite. The hybrid materials were characterized by X-ray diffraction, energy dispersive spectroscopy, scanning electron microscopy, UV-Vis spectroscopy and surface analysis (surface area by BET, pore size and volume by and BJH). After dispersing the hybrid materials into poly(vinyl alcohol), colored and transparent films were obtained by wet casting. After conditioned into desiccators at controlled humidity of 43 ± 2% for one week, the films were evaluated in relation to their mechanical properties. In general, the material PVA-PGS/AM increases Young’s modulus and ultimate tensile strength reducing the elongation while raw paligorskite and PVA-PGS/VC presented an opposite behavior.

Keywords

azo dyes, hybrid materials, mechanical properties, palygorskite, poly(vinyl alcohol).

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