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• W3215087233 endingPage "e00369" @default.
• W3215087233 startingPage "e00369" @default.
• W3215087233 abstract "Multiple natural polymers have been investigated for the synthesis of hydrogels to the present date, but lignin has demonstrated to be a promising one for this purpose for the multiple advantages it offers. Lignin can be isolated from lignocellulosic material such as nut shells, which are usually undervalued wastes, and would be a great step forward on circular economy. Thus, in the present work, lignin was extracted from almond and walnut shells following a single-step (delignification) and double-step (autohydrolysis and delignification) biorefinery scheme. After the chemical composition and structures of these lignins were determined, hydrogels were synthesized combining them with poly (vinyl alcohol) by the means of freeze-thawing cycles so as to study the influence of the different lignins on their final properties. Additionally, the last thawing cycle of the synthesis process was lengthened in order to confirm previous assumptions about its effect on the characteristics of the synthesized materials. The obtained results showed significant variation between the 8 lignin samples, especially in their purity, molecular weights and total phenolic contents. The variation on the lignins leaded to several hydrogel morphologies, which directly affected their properties, primarily their swelling capacity, glass transition temperatures and compression strengths. It was also demonstrated the great effect that the duration of the last thawing had on the morphology and, hence, on the characteristics of the obtained materials. The synthesized samples were successfully employed as dye adsorbents and the evaluation of their antifungal activity showed positive results in some of the samples, which could be applied for food packaging." @default.
• W3215087233 created "2021-12-06" @default.
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• W3215087233 date "2022-04-01" @default.
• W3215087233 modified "2023-10-14" @default.
• W3215087233 title "Impact of the lignin type and source on the characteristics of physical lignin hydrogels" @default.
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• W3215087233 doi "https://doi.org/10.1016/j.susmat.2021.e00369" @default.
• W3215087233 hasPublicationYear "2022" @default.
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