Journal of Polymers and the Environment ( IF 4.7 ) Pub Date : 2022-04-21 , DOI: 10.1007/s10924-022-02447-9 Isabelly Bertochi Veroneze 1 , Letícia Akemi Onoue 1 , Sandra Andrea Cruz 1
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Polypropylene is one of the most widely used polymers, especially in the food packaging industry, which causes negative environmental effects. Recycling is a good option to partially solve this environmental problem. Thus, the polymer was contaminated with a cocktail to simulate the conditions of disposal and recycling following FDA guidelines. The influence of contaminants on recycled PP was analyzed by quiescent and nonquiescent crystallization. It was found that the contaminants alter the crystallization flow since longer induction times were observed for all contaminated samples. Also, the thermal behavior was performed considering that the thermogravimetric (TGA) results indicated an increase in the stability with the presence of contaminants. Therefore, a deep investigation using the induced oxidation time and induced oxidation temperature was performed. The contaminants play an important role in the crystallization process, as well as, in the degradation of the samples. Furthermore, the use of TGA and DSC as complementary techniques is fundamental to analyze this influence.
Graphical Abstract
中文翻译：
食品接触用污染回收聚丙烯的热稳定性和结晶行为
聚丙烯是使用最广泛的聚合物之一，尤其是在食品包装行业，它会造成负面的环境影响。回收是部分解决这一环境问题的好选择。因此，聚合物被混合物污染，以模拟遵循 FDA 指南的处置和回收条件。通过静态和非静态结晶分析了污染物对回收聚丙烯的影响。发现污染物改变了结晶流动，因为对于所有受污染的样品都观察到更长的诱导时间。此外，考虑到热重 (TGA) 结果表明存在污染物时稳定性增加，因此进行了热行为。所以，使用诱导氧化时间和诱导氧化温度进行了深入研究。污染物在结晶过程以及样品降解中起着重要作用。此外，使用 TGA 和 DSC 作为互补技术是分析这种影响的基础。
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