Fornaro Mattia, Liguori Barbara, Ambrogi Veronica, Caputo Domenico
ACLabs-Applied Chemistry Labs, Department of Chemical, Materials and Industrial Production Engineering, University of Naples Federico II, P.le Tecchio 80, 80125 Napoli, Italy.
National Interuniversity Consortium of Materials Science and Technology (INSTM), Via G. Giusti 9, 50121 Firenze, Italy.
Polymers (Basel). 2024 Dec 2;16(23):3399. doi: 10.3390/polym16233399.
Zeolites are interesting inorganic additives that could be employed for plastic packaging applications. Polyethylene (PE) and polypropylene (PP) are intensively used for packaging as they provide great performance at low cost, even though they have poor environmental sustainability and may be more valorized. Biodegradable polymers may therefore represent a more eco-friendly alternative, but still, they have limited applications due to their generally inferior properties. Therefore, this review focuses on the use of zeolites as additives for flexible packaging applications to mainly improve the mechanical and barrier properties of PE, PP, and some biodegradable polymers, possibly with antimicrobial and scavenging activities, by exploiting zeolites' cation exchange ability and adsorption properties. Film preparation and characterization have been investigated. The obtained enhancements regard generally higher gas barriers, elastic moduli, and strengths, along with thermal stability. Elongation at break decreased for all PE composites and tended to increase for other matrices. The use of zeolites as additives for polymer films is promising (mainly for biodegradable polymers); still, it requires overcoming some limiting drawbacks associated with the additive concentration and dispersion mainly due to matrix-additive incompatibility.
沸石是一种有趣的无机添加剂，可用于塑料包装应用。聚乙烯（PE）和聚丙烯（PP）被广泛用于包装，因为它们能以低成本提供出色的性能，尽管它们的环境可持续性较差且可能更具价值。因此，可生物降解聚合物可能是一种更环保的替代品，但它们仍因普遍较差的性能而应用有限。因此，本综述重点关注沸石作为柔性包装应用添加剂的用途，主要通过利用沸石的阳离子交换能力和吸附特性来改善PE、PP和一些可生物降解聚合物的机械性能和阻隔性能，可能还具有抗菌和清除活性。研究了薄膜的制备和表征。所获得的增强效果通常包括更高的气体阻隔性、弹性模量和强度，以及热稳定性。所有PE复合材料的断裂伸长率均下降，而其他基体的断裂伸长率则趋于增加。将沸石用作聚合物薄膜的添加剂是有前景的（主要用于可生物降解聚合物）；然而，它需要克服一些与添加剂浓度和分散相关的限制缺点，主要是由于基体与添加剂不相容。
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