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Ionita, Daniela
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article
Dynamic Mechanical Analysis on Regenerated Cellulose
Abstract
<jats:p> Dynamical mechanical analysis was applied to two samples of cellulose (Cell 1 and Cell 2), obtained using the N-methylmorpholine-N-oxide blown technology in order to shed light on the secondary relaxations of cellulose. By tracking the storage modulus (E�), the loss modulus (E�) and loss factor (tand) vs. temperature it becomes possible to ascertain the dynamic molecular phenomena. A multiplex experiment (0.1, 0.5, 1, 5 and 10 Hz) was performed to calculate the apparent activation energy for the sub-glass transitions. Water and peculiarities of the fabrication process influence the dynamic mechanical behaviour of cellulose. To evidence the plasticizer/antiplasticizer role of water molecules four consecutive heating-isothermal-cooling cycles were accomplished. </jats:p>