Procedimentos para avaliação da degradação de reservatórios de polietileno para água potável expostos às intempéries.

Ribeiro, Maíse Vasques; Agopyan, Vahan

doi:10.11606/d.3.2004.tde-17092004-145545

Cited by 2 publications

(2 citation statements)

References 74 publications

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“…The initial generation of this of this species can be caused by agents such as high UV index, heat, biological attack, and chemical exposure, among others. These forms of initiation indicate the energy needed to break chemical bonds [53].…”

Section: Morphological Propertiesmentioning

confidence: 99%

Influence of Coupling Agent in Mechanical, Physical and Thermal Properties of Polypropylene/Bamboo Fiber Composites: Under Natural Outdoor Aging

2020

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Researches on thermoplastic composites using natural fiber as reinforcement are increasing, but studies of durability over time are scarce. In this sense the objective of this study is to evaluate changes in the properties of polypropylene/bamboo fiber (PP/BF) composite and the influence of the use of coupling agent (CA) in these composites after natural ageing. The PP/BF (70/30 wt) composites and 3% wt CA (citric acid from natural origin and maleic anhydride grafted polypropylene from petrochemical origin) were prepared by using an internal mixer chamber and then injection-molded. The samples were exposed to natural weathering for a total period of 12 months and characterized before and after exposure. All exposed composites experienced a decrease in their properties, however, the use of CA promoted more stability; in mechanical properties, the composites with CA showed lower loss about 23% in Young′s modulus, 18% in tensile stress at break, and 6% in impact strength. This behavior was similar in thermal and physical properties, the result for the CA of natural origin being similar to that of synthetic origin. These results indicate that the use of a CA may promote higher interaction between the fiber and the polymer. In addition, the CAs of organic origin and synthetic origin exhibited similar responses to natural ageing.

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Section: Morphological Propertiesmentioning

confidence: 99%

Influence of Coupling Agent in Mechanical, Physical and Thermal Properties of Polypropylene/Bamboo Fiber Composites: Under Natural Outdoor Aging

2020

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“…Dessa forma, somente os comprimentos acima de 280 nm conseguem alcançar a atmosfera terrestre. Deve-se ressaltar que, em adição à absorção parcial da radiação UV pelo ozônio, é necessário considerar a difusão da luz solar em interação com o ar e partículas (gotas de água e poeira) na atmosfera [75].…”

Section: 18-atividade Fotocatalíticaunclassified

Compostos de terras raras, com alta absortividade no ultravioleta, como agentes de proteção de radiações solares UV-A e UV-B

Peverari¹

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AgradecimentosAo professor Serra, meu orientador, pela oportunidade, paciência, amizade e por acreditar em mim.A todos os professores do departamento que contribuíram de algum modo, e especial a professora Rogéria.A FAPESP pela bolsa de doutorado direto concedida.A professora Yassuko e a todos os amigos do laboratório de Bioinorgânica. E a todas aquelas pessoas que estiveram sempre ao meu lado, e que de alguma maneira participaram deste trabalho durante estes anos.

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Procedimentos para avaliação da degradação de reservatórios de polietileno para água potável expostos às intempéries.

Cited by 2 publications

References 74 publications

Influence of Coupling Agent in Mechanical, Physical and Thermal Properties of Polypropylene/Bamboo Fiber Composites: Under Natural Outdoor Aging

Influence of Coupling Agent in Mechanical, Physical and Thermal Properties of Polypropylene/Bamboo Fiber Composites: Under Natural Outdoor Aging

Compostos de terras raras, com alta absortividade no ultravioleta, como agentes de proteção de radiações solares UV-A e UV-B

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