posted on 2024-02-23, 18:06authored byZheng Cheng, Jialin Li, Miao Su, Naiyu Xiao, Le Zhong, Xueqin Zhang, Shaowu Chen, Qifeng Chen, Weiquan Liang, Meixian Liu
With the continuous introduction of plastic restriction
policies
by the government and the continuous enhancement of people’s
awareness of environmental protection, the demand for food packaging
materials has also continued to increase, and the research and development
of biodegradable green packaging materials has become the frontier
research direction in the field of food packaging materials. In this
study, nanocellulose-based coating solution with high barrier properties
was prepared from oxidized cellulose nanofibrils (OCNFs) via sodium
periodate and compounded with chitosan solution (CTS) and then coated
on the substrate paper. Experiments have found that when the mass
fraction of the OCNF in the OCNF/CTS coating solution is 0.5%, the
coated paper exhibits the optimum comprehensive performance. The oxygen
transmission rate of the OCNF/CTS-coated paper dropped to 1.732 ×
10–11 cm3·cm/cm2·s·Pa,
and the water vapor transmission rate reduced to 2.236 × 10–12 g·cm/cm2·s·Pa. This is
due to the fact that the OCNF cross-linking with CTS improves the
compactness of the paper surface layer, which in turn enhances its
barrier. These findings suggested that the OCNF/CTS-coated paper has
great potential and prospect in the application of food packaging
materials, which provide a possible positive example of barrier coating
in the packaging field.