Nanostructured Films Produced from the Bleached Pinus sp. Kraft Pulp
Filmes Nanoestruturados Produzidos a partir de Polpa Kraft Branqueada de Pinus sp.
Lívia Cássia Viana; Graciela Ines Bolzon de Muñiz; Washington Luiz Esteves Magalhães; Alan Sulato de Andrade; Silvana Nisgoski; Daniele Cristina Potulski
Abstract
Keywords
Resumo
RESUMO: Este trabalho investiga as propriedades físicas e mecânicas de filmes nanoestruturados produzidos a partir da polpa kraft branqueada de Pinus sp. Para obter a nanocelulose, a polpa kraft branqueada foi submetida a seis diferentes intensidades de desfibrilação pelo moinho: dois, cinco, dez, 20, 30 e 40 passes. A influência do número de passes foi avaliada por meio das propriedades físicas e mecânicas dos filmes. Os resultados indicam que a presença de nanofibrilas reduziu a espessura e aumentou consideravelmente os valores de densidade dos filmes fabricados. Observou-se aumento da resistência à tração de 300% e o índice de ruptura foi dez vezes maior em relação aos papéis normais. A estrutura mais compacta e a menor porosidade causada pela maior superfície de contato entre as nanofibrilas nos filmes resultaram em maiores valores de densidade, resistência à tração e resistência à ruptura.
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