Enhancement of the fatigue life of recycled PP by incorporation of recycled opaque PET collected from household milk bottle wastes

Tramis, Olivier; Girard, Christian; Yus, Cristina; Irusta, Silvia; Chabert, France

doi:10.1016/j.wasman.2021.02.006

Cited by 14 publications

(11 citation statements)

References 15 publications

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“…PET deriving from opaque plastic waste samples is widely recognized as more recalcitrant to glycolysis than transparent ones, due to the presence of additional additives as, for instance, mineral nanoparticles as UV blockers. 41 Notably, in our case, glycolysis of PET from an opaque bottle occurred with a conversion comparable to the one observed for the colorless transparent bottle (entries 1 and 3 of Table 1). Conversely, the yield in BHET was much lower, amounting to only 20% compared with the 51% yield obtained using the colorless transparent bottle, and even lower than the yield afforded when plastic from the colored bottle was used as a starting material, i.e., 31% (entries 2 and 4 of Table 1).…”

Section: ■ Results and Discussionsupporting

confidence: 77%

Section: Resultssupporting

confidence: 62%

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Amino Acid-Based Cholinium Ionic Liquids as Sustainable Catalysts for PET Depolymerization

Marullo

Rizzo

Dintcheva

et al. 2021

ACS Sustainable Chem. Eng.

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Chemical recycling to monomers is one of the key strategies in tackling the issues deriving from persistent plastic pollution in the environment, and poly(ethylene terephthalate) (PET) is among the most used polymers in modern society. In this context, we herein describe the glycolysis of PET to bis-hydroxyethyl terephthalate (BHET), promoted by basic cholinium salts differing for the anions, also comprising amino acid anions. We investigated the optimal reaction conditions, finding that the best-performing catalyst is [Ch][Gly], in the presence of which a conversion of 85% and a yield of 51% are achieved at 150 °C after 6 h, from PET deriving from a clear water bottle. We used our protocol to carry out the glycolysis of PET deriving from different postconsumer waste, like opaque and colored bottles and food packages, finding that the performance is better in the former compared with the latter starting materials.

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Section: ■ Results and Discussionsupporting

confidence: 77%

Section: Resultssupporting

confidence: 62%

Amino Acid-Based Cholinium Ionic Liquids as Sustainable Catalysts for PET Depolymerization

Marullo

Rizzo

Dintcheva

et al. 2021

ACS Sustainable Chem. Eng.

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“…Few authors have investigated this problem. Tramis et al [30] studied the increase of the mechanical properties (tensile and fatigue life) of recycled polypropylene (rPP) by the incorporation of uncompatibilized blends with r-PET. These blends could be used to substitute r-PP for similar applications.…”

Section: Introductionmentioning

confidence: 99%

Structure and Properties of Reactively Extruded Opaque Post-Consumer Recycled PET

et al. 2021

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The recyclability of opaque PET, which contains TiO2 nanoparticles, has not been as well-studied as that of transparent PET. The objective of this work is to recycle post-consumer opaque PET through reactive extrusion with Joncryl. The effect of the reactive extrusion process on the molecular structure and on the thermal/mechanical/rheological properties of recycling post-consumer opaque PET (r-PET) has been analyzed. A 1% w/w Joncryl addition caused a moderate increase in the molecular weight. A moderate increase in chain length could not explain a decrease in the overall crystallization rate. This result is probably due to the presence of branches interrupting the crystallizable sequences in reactive extruded r-PET (REX-r-PET). A rheological investigation performed by SAOS/LAOS/elongational studies detected important structural modifications in REX-r-PET with respect to linear r-PET or a reference virgin PET. REX-r-PET is characterized by a slow relaxation process with enlarged elastic behaviors that are characteristic of a long-chain branched material. The mechanical properties of REX-r-PET increased because of the addition of the chain extender without a significant loss of elongation at the break. The reactive extrusion process is a suitable way to recycle opaque PET into a material with enhanced rheological properties (thanks to the production of a chain extension and long-chain branches) with mechanical properties that are comparable to those of a typical virgin PET sample.

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“…This challenge will help to reduce the generation of plastic waste, poverty, and gender inequality, and to develop sustainable cities. Examples of the applied circular economy concept are related to food waste [ 5 ], plastic packaging [ 6 , 7 ], pyrolysis and gasification [ 8 ], the converting of plastic waste into road construction materials [ 9 ], etc.…”

Section: Introductionmentioning

confidence: 99%

Valorization of Polypropylene Waste in the Production of New Materials with Adequate Mechanical and Thermal Properties for Environmental Protection

et al. 2022

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Innovative composites based on polypropylene waste impurified cu HDPE (PPW) combined with two thermoplastic block-copolymers, namely styrene-butadiene-styrene (SBSBC) and styrene-isoprene-styrene (SISBC) block-copolymers, and up to 10 wt% nano-clay, were obtained by melt blending. SBSBC and SISBC with almost the same content of polystyrene (30 wt%) were synthesized by anionic sequential polymerization and used as compatibilizers for PPW. Optical microscopy evaluation of the PPW composites showed that the n-clay was encapsulated into the elastomer. Addition of n-clay, together with SBSBC or SISBC, increased the interphase surface of the components in the PPW composites and enhanced the superficial area/volume ratio, which led to a recycled material with improved performance. The data resulting from differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), mechanical evaluation, and dynamic mechanical analysis (DMA) revealed that PPW reinforcement with n-clay and styrene-diene block-copolymers allows the obtaining of composites with favorable mechanical and thermal properties, and excellent impact strength for potential engineering applications.

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Enhancement of the fatigue life of recycled PP by incorporation of recycled opaque PET collected from household milk bottle wastes

Cited by 14 publications

References 15 publications

Amino Acid-Based Cholinium Ionic Liquids as Sustainable Catalysts for PET Depolymerization

Amino Acid-Based Cholinium Ionic Liquids as Sustainable Catalysts for PET Depolymerization

Structure and Properties of Reactively Extruded Opaque Post-Consumer Recycled PET

Valorization of Polypropylene Waste in the Production of New Materials with Adequate Mechanical and Thermal Properties for Environmental Protection

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