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Pomegranate extract for the processing stabilization of polyethylene
Journal of Vinyl and Additive Technology ( IF 2.7 ) Pub Date : 2021-10-20 , DOI: 10.1002/vnl.21874
Dóra Tátraaljai 1, 2 , Yun Tang 3 , Emese Pregi 1, 2 , Erika Vági 3 , Béla Pukánszky 1, 2
Affiliation  

Active components with antioxidant activity were extracted from the powder of pomegranate peel and added to polyethylene at 1000 ppm. The stabilization effect of the extract was studied also in compounds containing a phosphorous secondary antioxidant. A commercial hindered phenolic antioxidant with and without a secondary stabilizer was used as reference. The polymer was processed in multiple extrusions, and its functional group content, processability, residual stability, and color were determined by Fourier-transform infrared (FTIR) spectroscopy, melt flow rate (MFR), and oxidation induction time (OIT) measurements as well as by the determination of the yellowness index. The pomegranate peel extract (POM) has very strong melt stabilization effect, which is comparable or better than that of the commercial hindered phenolic antioxidant used as reference. The extract hinders the reactions of the unsaturated groups of the polymer and prevents the formation of long-chain branches. Similar to the phenolic antioxidant, it hinders also oxidation, thus preventing the formation of carbonyl groups. On the other hand, the extract does not offer sufficient residual stability and the polymer stabilized with it cannot be used in long-term applications. The extract discolors the polymer somewhat that further limits its application possibilities. The contradiction of excellent processing stabilization and poor residual stability needs further study and explanation.

中文翻译:

石榴提取物用于聚乙烯加工稳定化

从石榴皮粉末中提取具有抗氧化活性的活性成分,并以 1000 ppm 添加到聚乙烯中。在含有磷次抗氧化剂的化合物中也研究了提取物的稳定效果。使用具有和不具有辅助稳定剂的商业受阻酚类抗氧化剂作为参考。聚合物经过多次挤压加工,其官能团含量、加工性能、残余稳定性和颜色也通过傅里叶变换红外 (FTIR) 光谱、熔体流动速率 (MFR) 和氧化诱导时间 (OIT) 测量来确定如通过黄度指数的测定。石榴皮提取物(POM)具有很强的熔体稳定作用,这与用作参考的商业受阻酚类抗氧化剂相当或更好。提取物阻碍聚合物的不饱和基团的反应并防止长链支链的形成。与酚类抗氧化剂类似,它也阻碍氧化,从而防止羰基的形成。另一方面,提取物不能提供足够的残留稳定性,并且用它稳定的聚合物不能用于长期应用。提取物使聚合物有些变色,进一步限制了其应用的可能性。加工稳定性好与残余稳定性差的矛盾需要进一步研究和解释。与酚类抗氧化剂类似,它也阻碍氧化,从而防止羰基的形成。另一方面,提取物不能提供足够的残留稳定性,并且用它稳定的聚合物不能用于长期应用。提取物使聚合物有些变色,进一步限制了其应用的可能性。加工稳定性好与残余稳定性差的矛盾需要进一步研究和解释。与酚类抗氧化剂类似,它也阻碍氧化,从而防止羰基的形成。另一方面,提取物不能提供足够的残留稳定性,并且用它稳定的聚合物不能用于长期应用。提取物使聚合物有些变色,进一步限制了其应用的可能性。加工稳定性好与残余稳定性差的矛盾需要进一步研究和解释。
更新日期:2021-10-20
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