Mechanosorptive creep in nanocellulose materials |
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| Authors: | Stefan B Lindström Erdem Karabulut Artem Kulachenko Houssine Sehaqui Lars Wågberg |
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| Institution: | 1.Mechanics, Department of Management and Engineering,The Institute of Technology, Link?ping University,Link?ping,Sweden;2.Department of Fiber and Polymer Technology,KTH Royal Institute of Technology,Stockholm,Sweden;3.Department of Solid Mechanics,KTH Royal Institute of Technology,Stockholm,Sweden |
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| Abstract: | The creep behavior of nanocellulose films and aerogels are studied in a dynamic moisture environment, which is crucial to
their performance in packaging applications. For these materials, the creep rate under cyclic humidity conditions exceeds
any constant humidity creep rate within the cycling range, a phenomenon known as mechanosorptive creep. By varying the sample
thickness and relative humidity ramp rate, it is shown that mechanosorptive creep is not significantly affected by the through-thickness
moisture gradient. It is also shown that cellulose nanofibril aerogels with high porosity display the same accelerated creep
as films. Microstructures larger than the fibril diameter thus appear to be of secondary importance to mechanosorptive creep
in nanocellulose materials, suggesting that the governing mechanism is found between molecular scales and the length-scales
of the fibril diameter. |
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