Copolymerized and blended poly(L-lactic acid)-based films with potential for dairy packaging: Soil degradation behavior
文献类型： 外文期刊
作者： Sun, Tao 1 ; Ren, Siying 1 ; Hu, Jian 1 ; Zhang, Jiatao 1 ; Liu, Linze 1 ; Du, Jiahui 1 ; Wang, Xing 2 ; Deng, Yuming 2 ; Yun, Xueyan 1 ; Dong, Tungalag 1 ;
作者机构： 1.Inner Mongolia Agr Univ, Coll Food Sci & Engn, 306 Zhaowuda Rd, Hohhot 010010, Inner Mongolia, Peoples R China
2.Inner Mongolia Dairy Technol Res Inst Co Ltd, 8 Guochuang West Rd, Hohhot 010080, Inner Mongolia, Peoples R China
3.Inner Mongolia Acad Agr & Anim Husb Sci, Hohhot 010031, Inner Mongolia, Peoples R China
关键词： One-step synthesis; Blended; Poly(lactic acid); Dairy packaging film; Degradation
期刊名称：INDUSTRIAL CROPS AND PRODUCTS （ 影响因子：6.2； 五年影响因子：6.2 ）
ISSN： 0926-6690
年卷期： 2025 年 234 卷
页码：
收录情况： SCI
摘要： Biodegradable PLLA-based cast films were prepared via melt blending poly(L-lactic acid) (PLLA) with poly(Llactic acid-co-butylene itaconate) (PLBI), poly(L-lactic acid-co-glycolic acid) (PLGA), and poly(L-lactic acid-cobutylene itaconate-co-glycolic acid) (PLBIGA) copolymers to enhance mechanical, barrier, and degradation properties for dairy packaging applications. Copolymers were synthesized using a one-step melt poly-condensation method, and the film properties were effectively controlled by adjusting the blending ratios. All blended films exhibited significantly improved toughness while maintaining high transparency. Specifically, PLLA/PLBIGA20 % film demonstrated a 90.1 % reduction in oxygen transmission rate (OTR) and a 54.3 % reduction in water vapor transmission rate (WVTR) compared to pure PLLA, and PLLA/PLBI20 % film reduced ultraviolet (UV) transmittance to 53 % in the 280-320 nm range. The soil degradation rates of blended films were notably higher than pure PLLA, with distinct degradation mechanisms observed for each copolymer; notably, PLLA/PLBIGA20 % film degraded simultaneously in both amorphous and crystalline regions. Blended films met food-contact safety standards and, when applied to commercial yogurt packaging, effectively preserved lactic acid bacteria viability, outperforming pure PLLA film. These findings demonstrate the strong potential of PLLAbased blended films as sustainable packaging solutions for dairy products.
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