期刊
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
卷 7, 期 4, 页码 3759-3771出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.8b04064
关键词
Biobased and biodegradable polymers; Poly(lactic acid) PLA; Wheat gluten; Hot-pressing; High-pressure homogenization; Spin coating; Corona treatment; Surface modification
资金
- European Social Fund-Friuli Venezia Giulia Region-Operational Program 2007/2013 [FP1340303009]
- University Italo-Francese [C2-64]
- Regional Council of Bourgogne-Franche Comte
- Fonds Europeen de Developpement Regional (FEDER)
Poly(lactic acid) or PLA is currently considered as one of the most promising substitutes of conventional plastics, with low environmental impact, especially for food packaging applications. Nevertheless, some drawbacks, such as high permeability to oxygen, are still limiting its industrial applications. The objective of this study was to highly increase the oxygen barrier performance of PLA without compromising its sustainable nature and following the principles of circular economy perspective. Coproducts coming from mill industries, such as wheat gluten proteins (WG), were used to produce PLA-WG-PLA multilayer complexes with improved barrier performance. Different technologies of industrial interest were considered: high-pressure homogenization of WG film forming dispersions, corona treatment of industrial PLA films, wet casting and spin coating for tailoring the WG coating thickness, and hot-pressing for shaping the multilayers. The impact of all these strategies on the properties (surface and bulk) and performances (barrier and adhesion) were investigated on the single constituent layers as well as on the final laminate. The most efficient complex increased more than 20 times (or 2000%) the barrier properties to oxygen and similar to 20% the barrier properties to water vapor, considering application conditions (50% relative humidity and 25 degrees C). The low thickness (similar to 60 mu m) of this complex also matched the requirement for flexible packaging applications. High-pressure homogenization, WG coating thickness, and hot-pressing positively and highly impacted the final properties of the multilayer, while the contribution of corona treatment was limited. This study unambiguously evidenced the potential of PLA-WG-PLA complexes as a valid sustainable substitute for high performing conventional plastics, and it could open an unexplored PLA market opportunity. In addition, it could motivate further investigations on PLA-based laminates for industrial interest, using other biopolymers from agro-industrial waste or byproducts.
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