From Waste to Schiff Base: Upcycling of Aminolysed Poly(ethylene terephthalate) Product

Otaibi, Ahmed Al; Alsukaibi, Abdulmohsen Khalaf Dhahi; Rahman, Md. Ataur; Mushtaque, Md.; Haque, Ashanul

doi:10.3390/polym14091861

Cited by 12 publications

(7 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…According to Scheme , this reaction occurs using 1,2-diaminopropane, a key step in increasing the transformation yields with respect to previously used reagents. The mechanism involves the formation of an intermediate amide linkage through a nucleophilic attack of the primary amine groups on ester bonds in PET-A . The reaction is followed by deprotonation of the hydroxyl group resulting in the final PET-B structure.…”

Section: Resultsmentioning

confidence: 99%

Anion Exchange Membranes Based on Chemical Modification of Recycled PET Bottles

Donnakatte Neelalochana,

Tomasino,

Di Maggio

et al. 2023

ACS Appl. Polym. Mater.

View full text Add to dashboard Cite

This study presents an innovative and effective solution for recycling PET bottles as raw for producing anion exchange membranes (AEMs) for electrochemical applications. This approach reduces the demand for pristine materials, a key principle of the circular economy and sustainability. PET was subjected to chemical modification by introducing cationic functional groups followed by methylation and OH– exchange process. The amination synthesis was optimized based on reaction time. The results indicate that ion exchange capacity, water uptake, and swelling ratio properties mainly depend on the degree of cationic functionalization. The optimized AEM exhibits ionic conductivity of 5.3 × 10–2 S·cm–1 and alkaline stability of 432 h in 1 M KOH at 80 °C. The membrane properties before and after the alkaline treatment were investigated using Fourier-transform infrared spectroscopy, thermogravimetric analysis, and scanning electron microscopy analysis. Computational chemistry analysis was employed to gain further insights into the membrane degradation mechanisms and pathways under alkaline conditions. This research and its findings are a step toward using recycled materials in the field of AEM technology.

show abstract

Section: Resultsmentioning

confidence: 99%

Anion Exchange Membranes Based on Chemical Modification of Recycled PET Bottles

Donnakatte Neelalochana,

Tomasino,

Di Maggio

et al. 2023

ACS Appl. Polym. Mater.

View full text Add to dashboard Cite

show abstract

“…As repolymerization of aminolysis products into PET is impossible, numerous examples “upcycle” the products. Diverse applications including electromagnetic interference foams, epoxy hardeners, hydrogel adsorbents, and Schiff bases have been explored. − Hedrick and colleagues used a catalyst-free aminolysis of PET at 120 °C over ∼2 h to produce antimicrobial polyionenes . The system appeared robust as postconsumer PET waste was used, however scale was not indicated.…”

Section: Poly(ethylene Terephthalate)mentioning

confidence: 99%

Depolymerization within a Circular Plastics System

Clark,

Shaver

2024

Chem. Rev.

View full text Add to dashboard Cite

The societal importance of plastics contrasts with the carelessness with which they are disposed. Their superlative properties lead to economic and environmental efficiency, but the linearity of plastics puts the climate, human health, and global ecosystems at risk. Recycling is fundamental to transitioning this linear model into a more sustainable, circular economy. Among recycling technologies, chemical depolymerization offers a route to virgin quality recycled plastics, especially when valorizing complex waste streams poorly served by mechanical methods. However, chemical depolymerization exists in a complex and interlinked system of end-of-life fates, with the complementarity of each approach key to environmental, economic, and societal sustainability. This review explores the recent progress made into the depolymerization of five commercial polymers: poly(ethylene terephthalate), polycarbonates, polyamides, aliphatic polyesters, and polyurethanes. Attention is paid not only to the catalytic technologies used to enhance depolymerization efficiencies but also to the interrelationship with other recycling technologies and to the systemic constraints imposed by a global economy. Novel polymers, designed for chemical depolymerization, are also concisely reviewed in terms of their underlying chemistry and potential for integration with current plastic systems.

show abstract

“…These terepthalamides were used as plasticizers for polylactide and polylactic acid to reduce brittleness or as resin components for photopolymerizable film production [ 34 ]. PET was reacted with 1,2-diamino propane at temperatures in the range of 100-130°C for 20-24 h, yielding a combination of products, namely, monomers, dimers, trimers, and oligomers; the reaction of the monomers with salicylaldehyde produced a Schiff base, which can be used as a precursor for biologically active ligands, complexes, and catalysts [ 35 ]. Aminolysis requires minimal energy and time, and a simple purification step for the synthesized products.…”

Section: Chemical Depolymerizationmentioning

confidence: 99%

Recent Advances in the Chemobiological Upcycling of Polyethylene Terephthalate (PET) into Value-Added Chemicals

Mudondo

Lee

Jeong

et al. 2022

J. Microbiol. Biotechnol.

View full text Add to dashboard Cite

Polyethylene terephthalate (PET) is a plastic material commonly applied to beverage packaging used in everyday life. Owing to PET’s versatility and ease of use, its consumption has continuously increased, resulting in considerable waste generation. Several physical and chemical recycling processes have been developed to address this problem. Recently, biological upcycling is being actively studied and has come to be regarded as a powerful technology for overcoming the economic issues associated with conventional recycling methods. For upcycling, PET should be degraded into small molecules, such as terephthalic acid and ethylene glycol, which are utilized as substrates for bioconversion, through various degradation processes, including gasification, pyrolysis, and chemical/biological depolymerization. Furthermore, biological upcycling methods have been applied to biosynthesize value-added chemicals, such as adipic acid, muconic acid, catechol, vanillin, and glycolic acid. In this review, we introduce and discuss various degradation methods that yield substrates for bioconversion and biological upcycling processes to produce value-added biochemicals. These technologies encourage a circular economy, which reduces the amount of waste released into the environment.

show abstract

From Waste to Schiff Base: Upcycling of Aminolysed Poly(ethylene terephthalate) Product

Cited by 12 publications

References 30 publications

Anion Exchange Membranes Based on Chemical Modification of Recycled PET Bottles

Anion Exchange Membranes Based on Chemical Modification of Recycled PET Bottles

Depolymerization within a Circular Plastics System

Recent Advances in the Chemobiological Upcycling of Polyethylene Terephthalate (PET) into Value-Added Chemicals

Contact Info

Product

Resources

About