Polyvinyl Alcohol/Montmorillonite Nanocomposite Coated Biodegradable Films With Outstanding Barrier Properties 

Shuangshuang Yue1

Shuanjin Wang1

Dongmei Han1,2

Sheng Huang1

Luyi Sun3,Email

Min Xiao1,Email

Yuezhong Meng1

1The Key Laboratory of Low-carbon Chemistry & Energy Conservation of Guangdong Province, State Key Laboratory of Optoelectronic Materials and Technologies, School of Materials Science and Engineering, Sun Yat-sen University, Guangzhou 510275, China.

2School of Chemical Engineering and Technology, Sun Yat-sen University, Zhuhai 519000, China.

3Polymer Program, Institute of Materials Science and Department of Chemical and Biomolecular Engineering, University of Connecticut, Storrs, CT 06269, USA.

Abstract

An effective gas barrier nanocomposite coating based on polyvinyl alcohol (PVA) and montmorillonite (MMT) was applied onto two biodegradable polymer substrates, cellulose and poly(propylene carbonate-co-phthalate) (PPC-P), via a dip-coating and flow-induced self-assembly method. The microstructure, transparency, wettability, and gas barrier performance of the coated substrates were systematically investigated. Thanks to the high level of dispersion and orientation of the MMT nanosheets, the PVA/MMT nanocoating with a nacre-like microstructure endowed the coated substrates with significantly improved gas barrier properties. The OTR and WVTR of the coated cellulose/PPC-P films decreased to 0.35/<0.02 cm3/(m2·day) and 13.06/0.23 g/(m2·day), respectively. Moreover, the coated substrates exhibited excellent optical transmittance. Therefore, the PVA/MMT coated cellulose and PPC-P films with excellent gas barrier performance and high transparency show competitive potential for green packaging applications.

Polyvinyl Alcohol/Montmorillonite Nanocomposite Coated Biodegradable Films With Outstanding Barrier Properties