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Filename: drivers/Session_files_driver.php

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File: /home/orthodiedw/nutridatabase/application/controllers/Articles.php
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File: /home/orthodiedw/nutridatabase/index.php
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File: /home/orthodiedw/nutridatabase/application/controllers/Articles.php
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File: /home/orthodiedw/nutridatabase/index.php
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Filename: drivers/Session_files_driver.php

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File: /home/orthodiedw/nutridatabase/application/controllers/Articles.php
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Filename: drivers/Session_files_driver.php

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File: /home/orthodiedw/nutridatabase/application/controllers/Articles.php
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Filename: drivers/Session_files_driver.php

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File: /home/orthodiedw/nutridatabase/application/controllers/Articles.php
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Filename: drivers/Session_files_driver.php

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File: /home/orthodiedw/nutridatabase/application/controllers/Articles.php
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File: /home/orthodiedw/nutridatabase/index.php
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Nanocomposites à base de graphène poly (alcool vinylique) préparés par réduction in situ en vert de l'oxyde de graphène par l'acide ascorbique: influence du contenu en graphène et du plastifiant au glycérol sur les propriétés.

Les propriétés améliorées des nanocomposites polymères par rapport aux polymères purs ne sont obtenues qu'en présence de nanocharges bien dispersées et d'une forte adhésion interfaciale. Dans cette étude, nous rapportons la préparation de films nanocomposites à base de poly (alcool vinylique) (PVA) remplis de feuilles de graphène (GS) bien dispersées par réduction in situ de l’oxyde de graphène (GO) dispersé dans une solution de PVA en utilisant de l’acide ascorbique (L-). AA) en tant que réducteur respectueux de l'environnement. L'effet combiné de la teneur en GS et du glycérol en tant que plastifiant sur les propriétés de structure, thermiques, mécaniques, d'absorption de l'eau et de barrière à l'eau des films nanocomposites de PVA / GS est étudié pour la première fois. Une température de transition vitreuse plus élevée, une cristallinité, des températures de fusion et de cristallisation plus basses, des propriétés mécaniques plus élevées et une amélioration remarquable de la stabilité thermique par rapport au PVA pur sont obtenus grâce à de fortes interactions interfaciales entre GS et PVA par liaison hydrogène. Le film composite de PVA / GS préparé par procédé ex situ est plus fragile que son homologue préparé in situ. La présence de GS améliore les propriétés de barrière à l'eau et de résistance à l'eau des films nanocomposites en diminuant la perméabilité à la vapeur d'eau et l'absorption d'eau du PVA. Ce travail démontre que la personnalisation des propriétés nanocomposites du PVA / GS est rendue possible par le contrôle de la teneur en GS et en glycérol. Les nouveaux matériaux développés, en particulier ceux contenant un plastifiant, pourraient être des supports potentiels pour l'administration de médicaments par voie transdermique.


Source: https://www.ncbi.nlm.nih.gov/pubmed/30563225


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