Food Packaging Plastics: Identification and Recycling

Velásquez, Eliezer; Correa, Matías Guerrero; Garrido, Luan; Guarda, Abél; Galotto, María José; Dicastillo, Carol López de

doi:10.1007/978-981-16-3627-1_14

Cited by 7 publications

(2 citation statements)

References 122 publications

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“…Nonetheless, PP and other polyolefins degrade during the packaging's service life and the thermal-mechanical cycles applied during recycling. The occurrence and type of degradation reactions during recycling depend on the chemical structure and grade of the polymer, processing conditions and number of applied reprocessing cycles [4][5][6]. PP recycling leads to processability changes due to modification of viscosity and physical properties of polymers.…”

Section: Introductionmentioning

confidence: 99%

Developing Post-Consumer Recycled Flexible Polypropylene and Fumed Silica-Based Nanocomposites with Improved Processability and Thermal Stability

et al. 2023

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Collection and mechanical recycling of post-consumer flexible polypropylene packaging is limited, principally due to polypropylene being very light-weight. Moreover, service life and thermal–mechanical reprocessing degrade PP and change its thermal and rheological properties according to the structure and provenance of recycled PP. This work determined the effect of incorporating two fumed nanosilica (NS) types on processability improvement of post-consumer recycled flexible polypropylene (PCPP) through ATR-FTIR, TGA, DSC, MFI and rheological analysis. Presence of trace polyethylene in the collected PCPP increased the thermal stability of the PP and was significantly maximized by NS addition. The onset decomposition temperature raised around 15 °C when 4 and 2 wt% of a non-treated and organically modified NS were used, respectively. NS acted as a nucleating agent and increased the crystallinity of the polymer, but the crystallization and melting temperatures were not affected. The processability of the nanocomposites was improved, observed as an increase in viscosity, storage and loss moduli with respect to the control PCPP, which were deteriorated due to chain scission during recycling. The highest recovery in viscosity and reduction in MFI were found for the hydrophilic NS due to a greater impact of hydrogen bond interactions between the silanol groups of this NS and the oxidized groups of the PCPP.

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Section: Introductionmentioning

confidence: 99%

Developing Post-Consumer Recycled Flexible Polypropylene and Fumed Silica-Based Nanocomposites with Improved Processability and Thermal Stability

et al. 2023

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“…[ 2,20,21 ] The principal problem of this method is the high temperature of the process, which causes two types of degradation reactions in PET chains and leads to chain breakage, reduction of molecular weight, and descension of mechanical and rheological properties: (1) Thermal degradation that leads to the formation of smaller chains with terminal groups of vinyl ester and carboxyl and (2) hydrolysis that brings about smaller chains with the end groups of hydroxyl ester and carboxylic. [ 1,22–25 ] In addition, PET is inherently linear in structure and has a low‐molecular weight and a narrow molecular weight distribution. These two factors contribute to PET polymer issues in forming processes such as film blowing, blow molding, and foaming.…”

Section: Introductionmentioning

confidence: 99%

Long‐chain branching of polyethylene terephthalate: Rheological/thermal properties of polyethylene terephthalate/carbon nanotube nanocomposite

Dolatshah

Ahmadi

Ershad‐Langroudi

et al. 2022

Polymer Engineering & Sci

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Thermal degradation of polyethylene terephthalate (PET)/carbon nanotube (CNT) nanocomposites is a serious issue in the manufacturing process of this nanocomposite that can limit the applications of the nanocomposite. In this study, the effects of two kinds of chain extenders, pyromellitic dianhydride (PMDA) and pentaerythritol (PENTA), on the rheological behavior, thermal characteristics, and crystallinity of the PET were investigated. The results of shear rheology revealed improvement of the storage modulus and complex viscosity, which indicated the recoupling of broken chains, increasing the chain length, and the generation of long branches was the reason for chain extension. Also, differential scanning calorimetry (DSC) results clarified an increase in PET crystallization rate in the presence of CNT and chain extenders. Furthermore, SEM was performed to detect CNT dispersion in the nanocomposite, and four-probe technique test was utilized to determine the influence of CNT on the electrical properties of PET.

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Recycling

2023

Food Safety, Plastics and Sustainability

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Food Packaging Plastics: Identification and Recycling

Cited by 7 publications

References 122 publications

Developing Post-Consumer Recycled Flexible Polypropylene and Fumed Silica-Based Nanocomposites with Improved Processability and Thermal Stability

Developing Post-Consumer Recycled Flexible Polypropylene and Fumed Silica-Based Nanocomposites with Improved Processability and Thermal Stability

Long‐chain branching of polyethylene terephthalate: Rheological/thermal properties of polyethylene terephthalate/carbon nanotube nanocomposite

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