Combined effects of clay minerals and polyethylene glycol in the mechanical and water barrier properties of carboxymethylcellulose films
Carboxymethylcellulose (CMC), a biopolymer with good film-forming abilities, has rather poor mechanical and water vapor barrier properties which restrict its use in potential food packaging applications. Aiming to improve these properties, CMC was therefore modified by the addition of polyethylene glycol (PEG) and sodium-based clay nanofillers. The results showed the combined action of PEG and sodium montmorillonite greatly improved the tensile mechanical properties of CMC, increasing simultaneously its modulus (up to 260%), strength (up to 250%) and elongation (up to 300%). The barrier effect promoted by the clay nanoplatelets in combination with PEG also resulted in an almost fivefold decrease in water vapor permeability. With these improvements, the use of CMC in edible food packaging applications becomes more feasible.
Publication date: 15/11/2019
Author: Ana Paula Santos de Melo Fiori, Paulo Henrique Camani, Derval dos Santos Rosa, Danilo Justino Carastan
Industrial Crops and Products