2021
DOI: 10.1007/s10924-021-02214-2
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The Role of Residual Contaminants and Recycling Steps on Rheological Properties of Recycled Polypropylene

Abstract: Recycling of polymers is one of the alternatives to reduce the impact of polymers presence on the environmental. However, the contaminants, defined as non-intentionally added substances, present in recycled material may migrate into food and also change its molecular structure. This work addresses the extractability/migration of contaminants from polypropylene (PP) samples into food simulants and the influence of these contaminants on the molecular structure of recycled PP. For this PP was contaminated with se… Show more

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Cited by 12 publications
(2 citation statements)
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“…This result highlights the necessity of adding antioxidants to compensate, to some extent, for the deterioration of the post-consumer recycled plastics properties. As can be seen from Table 4 , the oxidation induction times of all the recycled PP samples vary between 41.6 and 61.4 s. The latter time is the best performance shown by rPPhwca samples with the most thorough hot-washing treatment with cleaning agents, corroborating various researchers’ conclusions [ 27 , 29 , 41 ] about the accelerating effect of thermo-oxidative degradation due to the presence of contaminants. Besides the antioxidant’s destruction and influence of the particulate contaminants, which cannot be entirely removed by washing, the concentration, and composition of residual polymerization catalysts and metal additives may contribute to the formation of degradation products and, thus, decrease the thermo-oxidative stability of PP [ 42 ].…”
Section: Resultssupporting
confidence: 81%
“…This result highlights the necessity of adding antioxidants to compensate, to some extent, for the deterioration of the post-consumer recycled plastics properties. As can be seen from Table 4 , the oxidation induction times of all the recycled PP samples vary between 41.6 and 61.4 s. The latter time is the best performance shown by rPPhwca samples with the most thorough hot-washing treatment with cleaning agents, corroborating various researchers’ conclusions [ 27 , 29 , 41 ] about the accelerating effect of thermo-oxidative degradation due to the presence of contaminants. Besides the antioxidant’s destruction and influence of the particulate contaminants, which cannot be entirely removed by washing, the concentration, and composition of residual polymerization catalysts and metal additives may contribute to the formation of degradation products and, thus, decrease the thermo-oxidative stability of PP [ 42 ].…”
Section: Resultssupporting
confidence: 81%
“…Mechanical recycling is the most common way of reusing post-consumer plastic caps [11], mainly because of the overall efficiency of the process [12]. Nevertheless, recycling systems should be designed considering each material's degradation mechanisms [13]. For PP and HDPE, this occurs due to successive recycling or exposure to solar radiation that causes scissions in the polymeric chains [14,15] and weakens their mechanical properties [16][17][18].…”
Section: Introductionmentioning
confidence: 99%