Molar Mass Alteration During Post-Consumer PET Recycling Using Polycarbodiimide-Based Additive

Freitas, Flavia Leticia Silva; Chinellato, Anne Cristine; Cruz, Sandra Andréa

doi:10.1007/s10924-020-01896-4

Cited by 5 publications

(1 citation statement)

References 41 publications

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“…The presence of contaminants in each step of the recycling process influences the molecular structure. Thus, the molar mass is one of the most important parameters and may be analyzed by the displacement of crossover point, that is G´() = G'' () [32,33], which is correlated with the increase or decrease of the molar mass, as well as the narrowing or widening of its distribution (Figure S1. -…”

Section: 3) Influence Of Residual Contaminants Into the Molecular Structurementioning

confidence: 99%

The Role of Residual Contaminants and Recycling Steps on Rheological Properties of Recycled Polypropylene

et al. 2021

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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 several substances to simulate a "worst-case" scenario and, then it was submitted to a recycling process. Extractability tests were performed by solid-phase microextraction and gas chromatography coupled to mass spectroscopy both to evaluate the presence of contaminants in the PP samples and their ability to migrate in food simulants. Additionally, molecular changes of the PP samples were evaluated by oscillatory rheometry. After washing and extrusion of the PP samples the extractability results showed considerable reductions of migrations in the food simulants and indicated, in some cases, compliance with regulations for using recycled polymer in contact with food. The residual contaminants were present in the polymer, the high temperatures and shear rates play an important role in molecular changes. Finally, the results highlight the importance of the use of rheological measurements to detect the influence of contaminants in recycled materials. Their presence result in material with different molar mass, that may be applied in different market applications.

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Section: 3) Influence Of Residual Contaminants Into the Molecular Structurementioning

confidence: 99%

The Role of Residual Contaminants and Recycling Steps on Rheological Properties of Recycled Polypropylene

et al. 2021

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Oscillation rheology, calorimetry and computed tomography: A practical toolkit combination of qualification for real poly(ethylene terephthalate) waste

Simon-Stőger,

Kovács,

Szigeti

et al. 2024

Journal of Cleaner Production

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Formulating PBS/PLA/PBAT blends for biodegradable, compostable packaging: The crucial roles of PBS content and reactive extrusion

Chuakhao,

Rodríguez,

Lapnonkawow

et al. 2024

Polymer Testing

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Molar Mass Alteration During Post-Consumer PET Recycling Using Polycarbodiimide-Based Additive

Cited by 5 publications

References 41 publications

The Role of Residual Contaminants and Recycling Steps on Rheological Properties of Recycled Polypropylene

The Role of Residual Contaminants and Recycling Steps on Rheological Properties of Recycled Polypropylene

Oscillation rheology, calorimetry and computed tomography: A practical toolkit combination of qualification for real poly(ethylene terephthalate) waste

Formulating PBS/PLA/PBAT blends for biodegradable, compostable packaging: The crucial roles of PBS content and reactive extrusion

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