Preparation of GO-g-PLBI Flexible Composite Film and Its Packaging Properties
ZHANG Yuan1, ZHANG Jiatao1, GUO Jia1, LI Yulu1, DONG Tungalag1, LI Shaobo2, YUN Xueyan1,*
1 College of Food Science and Engineering, Inner Mongolia Agricultural University, Hohhot 010018, China
2 Key Laboratory ofAgro-Products Processing, Institute of Food Science and Technology, Chinese Academy of Agricultural Sciences, Ministry of Agriculture and Rural Affairs, Beijing 100193, China
Abstract: Poly(L-lactic acid) (PLLA) is a promising alternative to conventional petroleum-based plastics due to its biodegradability, biocompatibility, and other advantageous properties. However, its practical application in food packaging is hindered by several limitations, including inherent brittleness, low UV resistance, and moderate air barrierperformance. To enhance the packaging properties of PLLA, unsaturated poly(butylene itaconate) (PBI) was first synthesized using melt polycondensation. Subsequently, graphene oxide (GO)-grafted unsaturated polylactic acid P(GO-g-LA-g-BI) (GO-g-PLBI) was prepared through in-situ polymerization. The resulting films were fabricated via the solution casting method and characterized by means of UV-visible spectroscopy, differential scanning calorimetry, and tensile property test. The experimental results demonstrated that GO could serve as an initiator in the lactic acid (LA) polycondensation process, facilitating the homogeneous dispersion of GO nanosheets and the formation of multibranched structures. This in turn enhanced the film’s thermal stability, tensile properties, and oxygen and UV-blocking capabilities, while simultaneously maintaining a high level of transparency (82.4%). Compared to the neat PLBI film, the GO-g-PLBI0.005 film exhibited an approximately 60% increase in elongation at break, while the oxygen transmission rate of the GO-g-PLBI0.05 film was reduced by about 35%. This study presents a viable approach for developing polylactic acid/graphene oxide nanocomposite food packaging materials with high barrier properties, thermal stability, UV resistance, and transparency.
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2026, Vol. 40 
