Journal
CARBOHYDRATE POLYMERS
Volume 117, Issue -, Pages 559-568Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2014.10.009
Keywords
Hydroscopic food packaging; Carboxymethylcellulose based hydrogel; Swelling-deswelling behaviour; Mechanical properties; Viscoelastic properties; Hydrothermal effect at humid atmosphere
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Funding
- Research and Development for Innovation Operational Program
- European Regional Development Fund (ERDF)
- national budget of the Czech Republic [CZ.1.05/2.1.00/03.0111, CZ.1.07/2.3.00/20.0104]
- Education for Competitiveness Operational Program
- European Social Fund (ESF)
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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 degrees 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 degrees C and 10%RH. (C) 2014 Elsevier Ltd. All rights reserved.
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