Methods of Recycling, Properties and Applications of Recycled Thermoplastic Polymers

Grigore, Mădălina Elena

doi:10.3390/recycling2040024

Cited by 375 publications

(248 citation statements)

References 59 publications

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“…The recycling method which circumvents these issues can be the chemical recycling. Hereby, the polymeric material is depolymerized to monomers or precursors for monomers that can be polymerized to generate new polymers with adjustable properties . Importantly, the basic chemical structure of the repeating units are not changed and can be cycled in the anthroposphere.…”

Section: Methodsmentioning

confidence: 99%

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Chemical Recycling of End‐of‐Life Polyamide 6 via Ring Closing Depolymerization

et al. 2019

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The chemical recycling of end‐of‐life polymers, a sequence of depolymerization and polymerization reactions, enables the conserving of fossil resources and can add some value to the circular economy. In this study, a process for the depolymerization of end‐of‐life Nylon 6 via ring‐closing reactions to produce as building block N‐acetylcaprolactam have been set up. In detail, a combination of acetic anhydride as depolymerization reagent and catalytic amounts of 4‐dimethylaminopyridine allows under microwave irradiation and within short times (15 min) the conversion of end‐of‐life Nylon 6 to N‐acetylcaprolactam under solvent‐less conditions. Applying optimized conditions a sequence of Nylon 6 goods was transformed in good yields. The product N‐acetylcaprolactam was converted to ϵ‐caprolactam by transfer of the acetyl functionality to 2‐aminoethanol to give N‐(hydroxyethyl)acetamide a precursor for poly(N‐vinylacetamide). The generated ϵ‐caprolactam can be used as monomer for the synthesis of new Nylon 6, therefore a chemical recycling of the monomeric unit of Nylon 6 is feasible.

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Section: Methodsmentioning

confidence: 99%

“…Hereby, the polymeric material is depolymerized to monomers or precursors for monomers that can be polymerized to generate new polymers with adjustable properties. [8,12,13] Importantly, the basic chemical structure of the repeating units are not changed and can be cycled in the anthroposphere. In consequence, no additional fossil resources are required.…”

mentioning

confidence: 99%

Chemical Recycling of End‐of‐Life Polyamide 6 via Ring Closing Depolymerization

et al. 2019

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“…So it is clear that landfill or incinerating the wasted PC is not a suitable waste treatment method and for this reason a resourceful and economically viable recycling process is important because of both environmental and economic benefits [56]. PC can be recycled by three main different ways: direct recycling (the polymer is separated from its associated contaminants and it can be readily reprocessed by conventional melt extrusion or dissolution/reprecipitation techniques), recycling via chemical methods (the polymer is chemically converted to monomers or partially depolymerized to oligomers), and thermochemical recycling (pyrolysis) [56][57][58].…”

Section: Introductionmentioning

confidence: 99%

“…PP-this polymer can be produced in a variety of structures which can be used in a variety of applications, such as compost bins, curbside recycling crates, and laboratory equipment [57]. PP presents some ideal properties, like mechanical properties and the resistance to chemical solvents [13,59].…”

Section: Introductionmentioning

confidence: 99%

Waste Electrical and Electronic Equipment: A Review on the Identification Methods for Polymeric Materials

et al. 2019

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Considering that the large quantity of waste electrical and electronic equipment plastics generated annually causes increasing environmental concerns for their recycling and also for preserving of raw material resources, decreasing of energy consumption, or saving the virgin materials used, the present challenge is considered to be the recovery of individual polymers from waste electrical and electronic equipment. This study aims to provide an update of the main identification methods of waste electrical and electronic equipment such as spectroscopic fingerprinting, thermal study, and sample techniques (like identification code and burning test), and the characteristic values in the case of the different analyses of the polymers commonly used in electrical and electronic equipment. Additionally, the quality of the identification is very important, as, depending on this, new materials with suitable properties can be obtained to be used in different industrial applications. The latest research in the field demonstrated that a complete characterization of individual WEEE (Waste Electric and Electronic Equipment) components is important to obtain information on the chemical and physical properties compared to the original polymers and their compounds. The future directions are heading towards reducing the costs by recycling single polymer plastic waste fractions that can replace virgin plastic at a ratio of almost 1:1.

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“…This process remaining to be the most popular as it ensures simplicity, low cost, and applicability to clean uncontaminated single-type waste. It involves melting with use of solvents and remolding of clean materials [19].…”

mentioning

confidence: 99%

Thermoplastic Recycling: Properties, Modifications, and Applications

Azeez¹

2020

Thermosoftening Plastics

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The increasing rate of plastic waste generation coupled with undesirable disposal, especially in the urban areas, has resulted to environmental threat in the globe which has been attributed to legislation, poor biodegradability, economic growth, rural to urban migration, increase in consumption, and standard or cost of living. This chapter will focus on overview, properties of virgin and recycled thermoplastics, recycling techniques, and applications of different types of thermoplastic articles such as HDPE, LDPE, PVC, PET, and polypropylene (PP) with improved properties based on modifications using eco-friendly materials for sustainable applications in order to save human existence from the menace of environmental and economic issues.

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Methods of Recycling, Properties and Applications of Recycled Thermoplastic Polymers

Cited by 375 publications

References 59 publications

Chemical Recycling of End‐of‐Life Polyamide 6 via Ring Closing Depolymerization

Chemical Recycling of End‐of‐Life Polyamide 6 via Ring Closing Depolymerization

Waste Electrical and Electronic Equipment: A Review on the Identification Methods for Polymeric Materials

Thermoplastic Recycling: Properties, Modifications, and Applications

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