Ultraviolet protection of recycled polyethylene terephthalate

Curtzwiler, Greg W.; Williams, Eric B.; Maples, A. L.; Davis, Nathan W.; Bahns, Ted L.; León, Joseba; Vorst, Keith

doi:10.1002/app.45181

Cited by 26 publications

(14 citation statements)

References 29 publications

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“…165 The use of radical scavengers, such as organic phosphates, is another option to hinder radical induced oxidation of the terephthalate ring, which is a source of yellowing. 159,169 The most common problem in PET reprocessing is viscosity reduction (molecular weight reduction) due to hydrolytic degradation and thermal oxidation. Color change in the postconsumer PET is another vital problem and normally the industry solves the problem by "openloop recycling " or "semi-closed-loop recycling".…”

Section: Improvements In Pet Reprocessingmentioning

confidence: 99%

Expanding Plastics Recycling Technologies: Chemical Aspects, Technology Status and Challenges

Aguirre-Villegas

Allen

et al. 2022

Preprint

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Less than 10% of the plastics generated globally are recycled, while the rest are incinerated, accumulated in landfills, or leach into the environment. New technologies are emerging to chemically recycle waste plastics that are receiving tremendous interest from academia and industry. Chemists and chemical engineers need to understand the fundamentals of these technologies to design improved systems for chemical recycling and upcycling of waste plastics. In this paper, we review the entire life cycle of plastics and options for the management of plastic waste to address barriers to industrial chemical recycling and further provide perceptions on possible opportunities with such materials. Knowledge and insights to enhance plastic recycling beyond its current scale are provided. Outstanding research problems and where researchers in the field should focus their efforts in the future are also discussed.

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Section: Improvements In Pet Reprocessingmentioning

confidence: 99%

Expanding Plastics Recycling Technologies: Chemical Aspects, Technology Status and Challenges

Aguirre-Villegas

Allen

et al. 2022

Preprint

Self Cite

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“…47 During certain photodegradation processes, yellowing of the PoE is observed due to light-induced reactions as a result of the formation of conjugated alkene 48 or quinone derivatives. 49,50 A wide range of synthetic and natural polymers retain UV radiation and go through photolytic, photooxidative and thermo-oxidative responses that lead to their defragmentation. 51 Photodegradation is carried out by the retention of photons.…”

Section: Photocatalytic Degradation Of the Polyestersmentioning

confidence: 99%

Insights into polyester plastic biodegradation by carboxyl ester hydrolases

Gricajeva

Nadda

Gudiukaitė

2021

J of Chemical Tech & Biotech

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Environmental pollution caused by polyesters has become a major ecological safety concern that needs to be managed urgently. One way to resolve this problem is giving the spotlight to current emerging research of microbial biocatalysts. During the last two decades many researchers have reported the ability to break down and modify natural and synthetic polyesters using different microbial carboxyl ester hydrolases (lipases, esterases, cutinases, PETases, etc.) also called polyesterases, and contribution of these enzymes towards the reduction of plastic levels in the future. Continuous search of such lipolytic biocatalysts and their improvement via protein engineering strategies results in beneficial findings making the use of polyesterases in the biodegradation of plastics increasingly more realistic. The present review provides a comprehensive insight into the structural properties enabling microbial lipolytic-type carboxyl ester hydrolases to effectively catalyze the cleavage of ester linkages in different polyester plastics. Moreover, the management of extensively used polyester plastics using different lipolytic enzymes as an innovative eco-friendly solution is presented in this report. Furthermore, improvement of polyesterases via protein engineering for the development of more effective and suitable polyester-degrading lipolytic biocatalysts is summarized in this review as well.

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“…Biobased materials aim to provide sustainable alternatives to traditionally petroleum derived materials, such as coatings, adhesives, and construction chemicals. [1][2][3][4] Beyond the raw material cost, limited performance inhibits the replacement of petroleum-based polymers by their biobased counterparts. Taking coating materials as an example, the properties of biobased coatings must be improved, particularly their mechanical strength and water resistance.…”

Section: Introductionmentioning

confidence: 99%