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首页> 外文期刊>Journal of Applied Polymer Science >LDPE-based blends and films stabilized with nonreleasing polymeric antioxidants for safer food packaging
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LDPE-based blends and films stabilized with nonreleasing polymeric antioxidants for safer food packaging

机译：LDPE基共混物和薄膜用不释放聚合的抗氧化剂稳定，可确保食品包装更安全

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摘要

Several novel random copolymers of ethylene and 1-olefin counits bearing a highly efficient phenolic antioxidant moiety placed at different distances from the polymerizable double bond were prepared in the presence of a metallocene catalyst. These copolymers were melt-blended with an antioxidant-free LDPE in an internal batch mixer to obtain innovative materials containing nonreleasing polymeric antioxidants suitable for safer food packaging applications. Blends and films, obtained by compression molding, were tested for their thermal and thermo-oxidative stability by thermogravimetric analysis both in dynamic and isothermal conditions. Films containing the macromolecular antioxidants showed a longer induction time before O _2 uptake starts and, consequently, a higher degradation temperature than neat LDPE or LDPE containing a low molecular weight commercial additive. Aging tests demonstrated that the new polymeric antioxidants also exert a valid protection against photo-oxidation. Eventually, migration tests demonstrated the absence of any trace of products containing the antioxidant moiety when the films were kept in contact with a food simulant.
机译：在茂金属催化剂的存在下，制备了几种新型的乙烯和1-烯烃共单元的无规共聚物，它们带有距可聚合双键不同距离的高效酚类抗氧化剂部分。这些共聚物在内部批量混合器中与不含抗氧化剂的LDPE熔融共混，以获得适用于更安全食品包装应用的，包含非释放性聚合抗氧化剂的创新材料。通过压缩成型获得的共混物和薄膜在动态和等温条件下通过热重分析测试其热稳定性和热氧化稳定性。含有大分子抗氧化剂的薄膜在开始吸收O _2之前显示出更长的诱导时间，因此其降解温度比纯LDPE或含有低分子量商业添加剂的LDPE高。老化测试表明，新型的聚合抗氧化剂还可以有效防止光氧化。最终，迁移测试表明，当薄膜与食品模拟物保持接触时，没有任何痕量的含有抗氧化剂部分的产品。

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