Person:
Sánchez Salvador, José Luis

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First Name
José Luis
Last Name
Sánchez Salvador
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https://hdl.handle.net/20.500.14352/86273
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Universidad Complutense de Madrid
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Ciencias Químicas
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Ingeniería Química y de Materiales
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Author: Negro Álvarez, Carlos Manuel × Subject: 54 ×

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    Synergies between fibrillated nanocellulose and hot-pressing of papers obtained from high-yield pulp
    (Nanomaterials, 2023) Negro Álvarez, Carlos Manuel; Pettersson, Gunilla; Mattsson, Amanda; Nyström, Staffan; Sánchez Salvador, José Luis; Blanco Suárez, María Ángeles; Engstrand, Per
    To extend the application of cost-effective high-yield pulps in packaging, strength and barrier properties are improved by advanced-strength additives or by hot-pressing. The aim of this study is to assess the synergic effects between the two approaches by using nanocellulose as a bulk additive, and by hot-pressing technology. Due to the synergic effect, dry strength increases by 118% while individual improvements are 31% by nanocellulose and 92% by hot-pressing. This effect is higher for mechanical fibrillated cellulose. After hot-pressing, all papers retain more than 22% of their dry strength. Hot-pressing greatly increases the paper’s ability to withstand compressive forces applied in short periods of time by 84%, with a further 30% increase due to the synergic effect of the fibrillated nanocellulose. Hot-pressing and the fibrillated cellulose greatly decrease air permeability (80% and 68%, respectively) for refining pretreated samples, due to the increased fiber flexibility, which increase up to 90% using the combined effect. The tear index increases with the addition of nanocellulose, but this effect is lost after hot-pressing. In general, fibrillation degree has a small effect which means that low- cost nanocellulose could be used in hot-pressed papers, providing products with a good strength and barrier capacity.