Dépôt numérique

Radiation grafting on natural films

Lacroix, Monique, Khan, Ruhul A., Senna, Magdy, Sharmin, Nusrat, Salmieri, Stéphane et Safrany, Ágnes (2014). Radiation grafting on natural films Radiation Physics and Chemistry , vol. 94 , nº 1. p. 88-92. DOI: 10.1016/j.radphyschem.2013.04.008.

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Different methods of polymer grafting using gamma irradiation are reported in the present study for the preparation of newly functionalized biodegradable films, and some important properties related to their mechanical and barrier properties are described. Biodegradable films composed of zein and poly(vinyl alcohol) (PVA) were gamma-irradiated in presence of different ratios of acrylic acid (AAc) monomer for compatibilization purpose. Resulting grafted films (zein/PVA-g-AAc) had their puncture strength (PS=37-40Nmm-1) and puncture deformation (PD=6.5-9.8mm) improved for 30% and 50% PVA in blend, with 5% AAc under 20kGy. Methylcellulose (MC)-based films were irradiated in the presence of 2-hydroxyethyl methacrylate (HEMA) or silane, in order to determine the effect of monomer grafting on the mechanical properties of films. It was found that grafted films (MC-g-HEMA and MC-g-silane) using 35% monomer performed higher mechanical properties with PS values of 282-296Nmm-1 and PD of 5.0-5.5mm under 10kGy. Compatibilized polycaprolactone (PCL)/chitosan composites were developed via grafting silane in chitosan films. Resulting trilayer grafted composite film (PCL/chitosan-g-silane/PCL) presented superior tensile strength (TS=22MPa) via possible improvement of interfacial adhesion (PCL/chitosan) when using 25% silane under 10kGy. Finally, MC-based films containing crystalline nanocellulose (CNC) as a filling agent were prepared and irradiated in presence of trimethylolpropane trimethacrylate (TMPTMA) as a grafted plasticizer. Grafted films (MC-g-TMPTMA) presented superior mechanical properties with a TS of 47.9MPa and a tensile modulus (TM) of 1792MPa, possibly due to high yield formation of radicals to promote TMPTMA grafting during irradiation. The addition of CNC led to an additional improvement of the barrier properties, with a significant 25% reduction of water vapor permeability (WVP) of grafted films.

Type de document: Article
Mots-clés libres: Chitosan; Hema; Methylcellulose; Nanocellulose; Polycaprolactone; Silane
Centre: Centre INRS-Institut Armand Frappier
Date de dépôt: 01 juin 2017 20:48
Dernière modification: 02 déc. 2020 19:11
URI: https://espace.inrs.ca/id/eprint/3071

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