title: Hydrothermal effect and mechanical stress properties of carboxymethylcellulose based hydrogel food packaging.
abstract: The PVP-CMC hydrogel film is biodegradable, transparent, flexible, hygroscopic and breathable material which can be used as a food packaging material. The hygroscopic character of CMC and PVP plays a big role in the changing of their mechanical properties where load carrying capacity is one of important criteria for packaging materials. This paper reports about the hydrothermal effect on the mechanical and viscoelastic properties of neat CMC, and PVP-CMC (20:80) hydrogel films under the conditions of combined multiple stress factors such as temperature, time, load, frequency and humidity. The dry films were studied by transient and dynamic oscillatory experiments using dynamic mechanical analyser combined with relative humidity chamber (DMA-RH). The mechanical properties of PVP-CMC hydrogel film at room temperature (25 °C), in the range of 0-30%RH remain steady. The 20 wt% of PVP in PVP-CMC hydrogel increases the stiffness of CMC from 2940 to 3260 MPa at 25 °C and 10%RH.
authors.affiliation: Institute for Chemistry and Technology of Materials, Graz University of Technology, Stremayrgasse 9, 8010 Graz, Austria.
authors.forename: Adriana
authors.initials: A
authors.lastname: Gregorova
authors.affiliation: Centre of Polymer Systems, University Institute, Tomas Bata University in Zlin, Nad Ovcirnou 3685, 760 01 Zlin, Czech Republic. Electronic address: nabanita@ft.utb.cz.
authors.forename: Nabanita
authors.initials: N
authors.lastname: Saha
authors.affiliation: Centre of Polymer Systems, University Institute, Tomas Bata University in Zlin, Nad Ovcirnou 3685, 760 01 Zlin, Czech Republic.
authors.forename: Takeshi
authors.initials: T
authors.lastname: Kitano
authors.affiliation: Centre of Polymer Systems, University Institute, Tomas Bata University in Zlin, Nad Ovcirnou 3685, 760 01 Zlin, Czech Republic.
authors.forename: Petr
authors.initials: P
authors.lastname: Saha
mesh_terms: D002266:Carboxymethylcellulose Sodium / Q000737:chemistry*; D018857:Food Packaging; D006358:Hot Temperature; D020136:Hydrogel, Polyethylene Glycol Dimethacrylate / Q000737:chemistry*; D011205:Povidone / Q000737:chemistry*; D013314:Stress, Mechanical
chemical_list: D020136:Hydrogel, Polyethylene Glycol Dimethacrylate; D011205:Povidone; D002266:Carboxymethylcellulose Sodium
keywords: Carboxymethylcellulose based hydrogel; Hydroscopic food packaging; Hydrothermal effect at humid atmosphere; Mechanical properties; Swelling–deswelling behaviour; Viscoelastic properties