In this paper, we systematically address the performance of cellulose nanocrystals (CNs)- coated flexible food packaging films. Firstly, the morphology of CNs from cotton linters and homogeneity of its coating on different substrates were characterized by transmission electronic microscopy and atomic force microscopy. Then, the 1.5 μm thick CNs coating on polyethylene terephthalate (PET), oriented polypropylene (OPP), orientated polyamide (OPA), and cellophane films were characterized for their mechanical, optical, anti-fog, and barrier properties. CNs coating reduces the coefficient of friction while maintaining high transparency (~90%) and low haze (3-4%) values, and shows remarkable oxygen barrier (Oxygen coefficient permeability of CNs coating, KPO2, 0.003 cm3 m-2 24h-1 kPa-1). In addition, the Gelbo flex test combined with PO2 measurements and optical microscopy are firstly reported for evaluating the durability of coatings, revealing that the CNs-coated PET and OPA provide the best performance among the investigated coated films. CNs are therefore considered to be a promising multi-functional coating for flexible food packaging.
Multi-functional coating of cellulose nanocrystals for flexible packaging applications / F. Li, P. Biagioni, M. Bollani, A. Maccagnan, L. Piergiovanni. - In: CELLULOSE. - ISSN 0969-0239. - 20:5(2013), pp. 2491-2504. [10.1007/s10570-013-0015-3]
Multi-functional coating of cellulose nanocrystals for flexible packaging applications
F. LiPrimo
;L. PiergiovanniUltimo
2013
Abstract
In this paper, we systematically address the performance of cellulose nanocrystals (CNs)- coated flexible food packaging films. Firstly, the morphology of CNs from cotton linters and homogeneity of its coating on different substrates were characterized by transmission electronic microscopy and atomic force microscopy. Then, the 1.5 μm thick CNs coating on polyethylene terephthalate (PET), oriented polypropylene (OPP), orientated polyamide (OPA), and cellophane films were characterized for their mechanical, optical, anti-fog, and barrier properties. CNs coating reduces the coefficient of friction while maintaining high transparency (~90%) and low haze (3-4%) values, and shows remarkable oxygen barrier (Oxygen coefficient permeability of CNs coating, KPO2, 0.003 cm3 m-2 24h-1 kPa-1). In addition, the Gelbo flex test combined with PO2 measurements and optical microscopy are firstly reported for evaluating the durability of coatings, revealing that the CNs-coated PET and OPA provide the best performance among the investigated coated films. CNs are therefore considered to be a promising multi-functional coating for flexible food packaging.File | Dimensione | Formato | |
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