Preparação e caracterização do polimetilmetacrilato dopado com óxido de tungstênio
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Data
2020-01-20
Autores
Mendonça, Tamires Perego
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Universidade Estadual Paulista (Unesp)
Resumo
A eficiência das novas tecnologias voltadas para a sustentabilidade depende, de modo geral, principalmente da estrutura e das propriedades dos materiais utilizados. O polimetilmetacrilato (PMMA) é muito utilizado atualmente por ser um polímero de fácil fabricação e apresentar características únicas como ser um material muito leve, barato, com alta resistência ao impacto, ter capacidade de ser despolimerizado e, essencialmente, por apresentar alta transparência. Sob a mesma perspectiva, o óxido de tungstênio é um dos metais de transição mais estudados devido as suas propriedades de polimorfismo, alta estabilidade química e as suas potenciais aplicações na ciência da informação e da computação, como em dispositivos optoeletrônicos, luminescentes, eletrocrômicos, fotocrômicos, sensores e em embalagens inteligentes para produtos alimentares e farmacêuticos. Diante de tais evidências, esta pesquisa teve como objetivo principal estudar as propriedades do óxido de tungstênio utilizando como substrato a matriz polimérica de PMMA. As amostras de PMMA puro e dopados com 10, 20, 30 e 40% do óxido de tungstênio foram obtidas através do método de deposição casting. Foi atingido um alto grau de homogeneidade e transparência, além de controladas as espessuras das amostras. Foram realizadas análises de Microscopia Eletrônica de Varredura (MEV), Espectroscopia de Energia Dispersiva (EDS), Difração de Raios X (DRX), Termogravimetria (TG), Espectroscopia de Absorção no Ultravioleta e Visível (UV-Vis), Análise de Energia de Band-gap e de Fotoluminescência. Por fim, destaca-se que foi possível obter muitas informações a respeito das propriedades do WO3 e do PMMA, contribuindo satisfatoriamente para o aprendizado e a consolidação dos conceitos e características desses materiais.
The efficiency of new sustainability-oriented technologies generally depends mainly on the structure and properties of the materials used. Today, Polymethyl methacrylate (PMMA) is widely used because it is an easy-to-manufacture polymer and has unique characteristics such as being a very lightweight, inexpensive material, with high impact resistance, being able to be depolymerized and essentially because of its high transparency. From the same perspective, tungsten oxide is one of the most studied transition metals due to its polymorphism properties, high chemical stability and its potential applications in information and computer science, such as optoelectronic, luminescent, electrochromic, photochromic devices, sensors and smart packaging for food and pharmaceutical products. Given this evidence, this research aimed to study the properties of tungsten oxide using as substrate the PMMA polymer matrix. Pure and doped PMMA samples with 10, 20, 30 and 40% of tungsten oxide were obtained through the casting deposition method. A high degree of homogeneity and transparency was achieved, as well as controlled sample thicknesses. Scanning Electron Microscopy (SEM), Dispersive Energy Spectroscopy (DES), X-Ray Diffraction (XRD), Thermogravimetry (TG), Ultraviolet and Visible Absorption Spectroscopy (UV-Vis) analyzes Band-gap Energy and Photoluminescence. Finally, it is emphasized that it was possible to obtain much information about the properties of WO3 and PMMA, contributing satisfactorily to the learning and the consolidation of the concepts and characteristics of these materials.
The efficiency of new sustainability-oriented technologies generally depends mainly on the structure and properties of the materials used. Today, Polymethyl methacrylate (PMMA) is widely used because it is an easy-to-manufacture polymer and has unique characteristics such as being a very lightweight, inexpensive material, with high impact resistance, being able to be depolymerized and essentially because of its high transparency. From the same perspective, tungsten oxide is one of the most studied transition metals due to its polymorphism properties, high chemical stability and its potential applications in information and computer science, such as optoelectronic, luminescent, electrochromic, photochromic devices, sensors and smart packaging for food and pharmaceutical products. Given this evidence, this research aimed to study the properties of tungsten oxide using as substrate the PMMA polymer matrix. Pure and doped PMMA samples with 10, 20, 30 and 40% of tungsten oxide were obtained through the casting deposition method. A high degree of homogeneity and transparency was achieved, as well as controlled sample thicknesses. Scanning Electron Microscopy (SEM), Dispersive Energy Spectroscopy (DES), X-Ray Diffraction (XRD), Thermogravimetry (TG), Ultraviolet and Visible Absorption Spectroscopy (UV-Vis) analyzes Band-gap Energy and Photoluminescence. Finally, it is emphasized that it was possible to obtain much information about the properties of WO3 and PMMA, contributing satisfactorily to the learning and the consolidation of the concepts and characteristics of these materials.
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Palavras-chave
Óxido de Tungstênio, Polimetilmetacrilato, Fotoluminescência, Tungsten oxide, Polymethylmetacrylato, Photoluminescence