Microwave-assisted chemical recycling of polylactide (PLA) by alcoholysis with various diols

Nim, Bunthoeun; Opaprakasit, Mantana; Petchsuk, Atitsa; Opaprakasit, Pakorn

doi:10.1016/j.polymdegradstab.2020.109363

Cited by 19 publications

(16 citation statements)

References 34 publications

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“…Microwave irradiation is employed as a heating source for shortening the reaction time and improving the reaction efficiency. The products are then utilized as starting materials for other value-added products, especially degradable lactide-based polyurethanes (PUs) [100].…”

Section: Chemolysis By Alcoholysismentioning

confidence: 99%

Chemical Recycling of PET in the Presence of the Bio-Based Polymers, PLA, PHB and PEF: A Review

et al. 2021

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The great increase in the production and consumption of plastics has resulted in large amounts of plastic wastes, creating a serious problem in terms of their environmentally friendly disposal. The need for the production of more environmentally friendly polymers gave birth to the production of biodegradable, and more recently, biobased polymers, used in the production of biodegradable or biobased plastics. Although the percentage of currently produced bioplastics is rather small, almost 1% compared to petrochemical-based plastics, inevitably is going to significantly increase in the near future due to strict legislation recently posed by the European Union and other countries’ Governments. Thus, recycling strategies that have been developed could be disturbed and the economic balance of this sector could be destabilized. In the present review, the recycling of the polymer mainly used in food plastic packaging, i.e., poly(ethylene terephthalate), PET is examined together with its counterparts from the biobased polymers, i.e., poly(lactic acid), PLA (already replacing PET in several applications), poly(3-hydroxybutyrate), PHB and poly(ethylene furanoate), PEF. Methods for the chemical recycling of these materials together with the chemical products obtained are critically reviewed. Specifically, hydrolysis, alcoholysis and glycolysis. Hydrolysis (i.e., the reaction with water) under different environments (alkaline, acidic, neutral), experimental conditions and catalysts results directly in the production of the corresponding monomers, which however, should be separated in order to be re-used for the re-production of the respective polymer. Reaction conditions need to be optimized with a view to depolymerize only a specific polymer, while the others remain intact. Alcoholysis (i.e., the reaction with some alcohol, methanol or ethanol) results in methyl or ethyl esters or diesters that again could be used for the re-production of the specific polymer or as a source for producing other materials. Glycolysis (reaction with some glycol, such as ethylene, or diethylene glycol) is much studied for PET, whereas less studied for the biopolymers and seems to be a very promising technique. Oligomers having two terminal hydroxyl groups are produced that can be further utilized as starting materials for other value-added products, such as unsaturated polyester resins, methacrylated crosslinked resins, biodegradable polyurethanes, etc. These diols derived from both PET and the bio-based polymers can be used simultaneously without the need for an additional separation step, in the synthesis of final products incorporating biodegradable units in their chemical structure.

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Section: Chemolysis By Alcoholysismentioning

confidence: 99%

Chemical Recycling of PET in the Presence of the Bio-Based Polymers, PLA, PHB and PEF: A Review

et al. 2021

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“…32,33 The resulting PLA-based polyols have a high potential in various applications, such as polymer blends, adhesives, sealants, and coating. Various alcohols have been employed in the alcoholysis of PLA, such as ethylene glycol, 34,35 1,3-propanediol, 36,37 1,4-butanediol, 38 glycerol, 39 pentaerythritol, 40 and dipentaerythritol. 36 During the alcoholysis reaction, ester bonds of PLA chains are cleaved through nucleophile attacks on the carbonyl group at a high temperature and pressure.…”

Section: Introductionmentioning

confidence: 99%

“…[41][42][43][44][45] A microwave reactor has proven as a highly efficient and cost-effective heating source, owing to its lower energy consumption, faster reaction rate, and shorter reaction time compared to other conventional techniques. 37,39,46 In this work, super-hydrophobic PLA nanofiber mats are developed by employing PLA-based oligomers with hydroxyl terminals as an additive to react with an alkyl ketene dimer (AKD) hydrophobic agent, as summarized in Scheme 1. The additive (gPLA) is obtained from the chemical recycling of postconsumer PLA via an alcoholysis with glycerol using a microwave reactor.…”

Section: Introductionmentioning

confidence: 99%

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Chemical upcycling of polylactide (PLA) and its use in fabricating PLA-based super-hydrophobic and oleophilic electrospun nanofibers for oil absorption and oil/water separation

et al. 2022

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“…, methanol, ethanol, ethylene glycol, propane-1,3-diol, butane-1,4-diol, and pentaerythritol. 8,10–17 In addition, the process can be applied to virgin PLA resin for sizing down the commercial high-molecular weight PLA to medium-sized products, which are suitable for specific applications, e.g. , adhesives, food-contact packaging, and cosmetics.…”

Section: Introductionmentioning

confidence: 99%

Polyester-based polyurethanes derived from alcoholysis of polylactide as toughening agents for blends with shape-memory properties

et al. 2022

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Microwave-assisted chemical recycling of polylactide (PLA) by alcoholysis with various diols

Cited by 19 publications

References 34 publications

Chemical Recycling of PET in the Presence of the Bio-Based Polymers, PLA, PHB and PEF: A Review

Chemical Recycling of PET in the Presence of the Bio-Based Polymers, PLA, PHB and PEF: A Review

Chemical upcycling of polylactide (PLA) and its use in fabricating PLA-based super-hydrophobic and oleophilic electrospun nanofibers for oil absorption and oil/water separation

Polyester-based polyurethanes derived from alcoholysis of polylactide as toughening agents for blends with shape-memory properties

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