Tratamento a plasma de polímeros comerciais transparentes
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Data
2010-03-04
Autores
Sant'Ana, Péricles Lopes [UNESP]
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Editor
Universidade Estadual Paulista (Unesp)
Resumo
O objetivo deste trabalho foi o estudo da modificação das propriedades estrutural, química e óptica da superfície de certos polímeros comerciais através do emprego das técnicas de Imersão em Plasmas (IP) e Implantação Iônica por Imersão em Plasmas (IIIP). Os polímeros investigados foram o policloreto de vinila (PVC) e o politereftalato de etila (PET). Foram empregados plasmas de hexafluoreto de enxofre ('SF IND. 6') como fonte de flúor, uma vez que, a fluoração de uma superfície tende a aumentar o seu caráter hidrofóbico. Por outro lado, investigou-se o efeito da composição do plasma, através de tratamentos com plasmas de nitrogênio ('N IND. 2'). Além disso, plasmas da mistura 'SF IND. 6/Isopropanol e 'N IND. 2'/Isopropanol, foram empregados para formar um filme fino sobre a superfície dos substratos tratados. Por fim, este trabalho contemplou ainda a investigação da morfologia superficial em escala nanométrica e as características de transparência à luz visível. As medidas de ângulo de contato indicaram que a deposição a plasma convencional (IP) aumenta consideravelmente os valores de ângulos de contato das amostras de PET e PVC para potências de descarga de RF até 100 W mediante o emprego de plasmas de 'SF IND. 6'. Neste caso, o maior valor de ângulo de contato foi de 140º. Por outro lado, a técnica de IIIP ocasiona uma diminuição nos valores de ângulo de contato mesmo em plasmas contendo flúor. Nesse caso, o menor valor de ângulo de contato observado foi de 18º. Vale ressaltar que a alteração seletiva na molhabilidade dos polímeros ocorreu sem alteração significativa na transparência óptica dos mesmos. Através das medidas de microbalança, observou-se que uma taxa de crescimento linear de 2,96nm/min.
The aim of this work was to study the modification of the structural, chemical and optical properties, on the surfaces of certain commercial polymers, produced by plasma immersion (PI) and plasma immersion ion implantation (IIIP). Polymers investigated include polyvinyl chloride and polyethylene terephthalate. Plasmas of sulfur hexafluoride ('SF IND. 6') were employed as source of fluoride, since surface fluorination increases the hydrophobic behavior of polymers. However, the effects of plasma composition were investigated by treatments using nitrogen. Plasmas of 'SF IND. 6/Isopropyl alcohol and of 'N IND. 2'/Isopropyl alcohol were also employed to deposit a thin film onto the surface of treated samples. Finally, nanoscale surface morphology and the transmission of visible light were studied. Contact angle measurements showed that PI considerably increased the contact angle values of PET and PVC, for RF powers up to 100 W. In this case, the highest values of contact angle was 140º. On the other hand, PIII technique decreased the contact angles, even fluorine containing plasmas. In this case, the smallest value of contact angle was 18º. It is noteworthy that the selective alteration in the wettability of the polymers of the occured without significant change in the optical transparency of them. Microbalance measurements calculated resulted in a linear rate of growth. Finally, measurements by perfilometry resulted in a linear rate of growth of 2.96nm per minute.
The aim of this work was to study the modification of the structural, chemical and optical properties, on the surfaces of certain commercial polymers, produced by plasma immersion (PI) and plasma immersion ion implantation (IIIP). Polymers investigated include polyvinyl chloride and polyethylene terephthalate. Plasmas of sulfur hexafluoride ('SF IND. 6') were employed as source of fluoride, since surface fluorination increases the hydrophobic behavior of polymers. However, the effects of plasma composition were investigated by treatments using nitrogen. Plasmas of 'SF IND. 6/Isopropyl alcohol and of 'N IND. 2'/Isopropyl alcohol were also employed to deposit a thin film onto the surface of treated samples. Finally, nanoscale surface morphology and the transmission of visible light were studied. Contact angle measurements showed that PI considerably increased the contact angle values of PET and PVC, for RF powers up to 100 W. In this case, the highest values of contact angle was 140º. On the other hand, PIII technique decreased the contact angles, even fluorine containing plasmas. In this case, the smallest value of contact angle was 18º. It is noteworthy that the selective alteration in the wettability of the polymers of the occured without significant change in the optical transparency of them. Microbalance measurements calculated resulted in a linear rate of growth. Finally, measurements by perfilometry resulted in a linear rate of growth of 2.96nm per minute.
Descrição
Palavras-chave
Filmes finos, Polimeros, Propriedades ópticas, Wettability, Optical properties, Thin films
Como citar
SANT'ANA, Péricles Lopes. Tratamento a plasma de polímeros comerciais transparentes. 2010. 86 f. Dissertação (mestrado) - Universidade Estadual Paulista, Faculdade de Ciências, 2010.