Ionic liquids/ZnO nanoparticles as recyclable catalyst for polycarbonate depolymerization

Iannone, F.; Casiello, Michele; Monopoli, Antonio; Cotugno, Pietro; Sportelli, Maria Chiara; Cioffi, Nicola; Dell’Anna, Maria Michela; Nacci, Angelo

doi:10.1016/j.molcata.2016.11.006

Cited by 108 publications

(80 citation statements)

References 56 publications

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“…[12] An attractive alternative to petrochemical-based plastics are plastics originated from renewables (biopolymers and bio-based polymers), but so far the rate of production is significantly lower. [56,[71][72][73][74][75] It was supposed that the alcohol is activated by the anion and the carbonyl function by the cation. Lactic acid methyl lactate (2) can be transformed to compound 3 (lactide), which is a fundamental compound in the industrial production chain of PLA (Scheme 1).…”

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confidence: 99%

“…Afterward, the degradation was carried out at a temperature of 180 °C for 20 min. [56,[71][72][73][74][75] The potassium cation can function as Lewis acid and coordinates the oxygen of the carbonyl function and by doing so the carbonyl carbon is activated and methanol can attack (oxygen atom of the methanol) the group as nucleophile. Nevertheless, a reuse/recycling of potassium fluoride is possible, which is in contrast to our earlier reported DMAP system.…”

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confidence: 99%

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Selective Degradation of End‐of‐Life Poly(lactide) via Alkali‐Metal‐Halide Catalysis

Alberti

Damps

Meißner

et al. 2019

Advanced Sustainable Systems

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The recycling of poly(lactide) (PLA) is studied. Using methanol and alkali‐metal‐halides as catalyst, PLA is degraded to produce methyl lactate, which is a suitable chemical for the regeneration of PLA. An excellent degree of degradation (conversions: >99%, yields: >99%) is achieved in less than 20 min utilizing microwave heating. Remarkably, PLA goods are successfully converted into methyl lactate.

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confidence: 99%

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confidence: 99%

Selective Degradation of End‐of‐Life Poly(lactide) via Alkali‐Metal‐Halide Catalysis

Alberti

Damps

Meißner

et al. 2019

Advanced Sustainable Systems

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“…For instance Iannone et al . reported on the application of ionic liquids in combination with zinc oxide nanoparticles in the alcoholysis of poly(bisphenol A carbonate) ( 1 ) . The group proposed an activation of the alcohol by hydrogen bonding interaction of the anion of the ionic liquid, which increase the nucleophilicity of oxygen of the OH‐group.…”

Section: Methodsmentioning

confidence: 99%

Depolymerization of End‐of‐Life Poly(bisphenol A carbonate) via Alkali‐Metal‐Halide‐Catalyzed Methanolysis

Alberti

Enthaler

2019

Asian J Org Chem

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“…A post-deposition thermal treatment was implemented, as an alternative method, on samples at φ = 0.15. At the end of a standard deposition, we proceeded to flush 5 sccm of O 2 in the IBS chamber for 10 m. After that, in the presence of the same gas, the temperature of the substrate holder was raised prior to 50 • C and then, with a step of 10 • C up to 100 • C, for 1 h. We choose not to exceed 100 • C because Teflon ® 's glass-transition temperature is 120 • C [53]. To test the efficacy of these two new protocols, samples were immediately subjected to a surface chemical composition analysis by parallel angle-resolved XPS (PAR-XPS).…”

Section: Treatments In Deposition Chamber To Reduce Fluorides Contentmentioning

confidence: 99%

New Insights in the Ion Beam Sputtering Deposition of ZnO-Fluoropolymer Nanocomposites

et al. 2018

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Abstract:Surface modification treatments able to confer antistain/antibacterial properties to natural or synthetic materials are receiving increasing attention among scientists. Ion beam co-sputtering (IBS) of zinc oxide (ZnO) and poly-tetrafluoroethylene (PTFE) targets allows for the preparation of novel multifunctional coatings composed of antimicrobial ZnO nanoparticles (NPs) finely dispersed in an antistain PTFE polymeric matrix. Remarkably, IBS has been proved to be successful in the controlled deposition of thin nanocoatings as an alternative to wet methods. Moreover, tuning IBS deposition parameters allows for the control of ZnONP loadings, thus modulating the antibacterial/antistain coating's final properties. All the deposited coatings were fully characterized by X-ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM), and transmission electron microscopy (TEM) in order to obtain information on the materials' surface composition, with deep insight into the nanocoatings' morphology as a function of the ZnONP loadings. An analysis of high-resolution XP spectra evidenced a high degree of polymer defluorination along with the formation of inorganic fluorides at increasing ZnO volume ratios. Hence, post-deposition treatments for fluorides removal, performed directly in the deposition chamber, were successfully developed and optimized. In this way, a complete stoichiometry for inorganic nanophases was obtained, allowing for the conversion of fluorides into ZnO.

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Ionic liquids/ZnO nanoparticles as recyclable catalyst for polycarbonate depolymerization

Cited by 108 publications

References 56 publications

Selective Degradation of End‐of‐Life Poly(lactide) via Alkali‐Metal‐Halide Catalysis

Selective Degradation of End‐of‐Life Poly(lactide) via Alkali‐Metal‐Halide Catalysis

Depolymerization of End‐of‐Life Poly(bisphenol A carbonate) via Alkali‐Metal‐Halide‐Catalyzed Methanolysis

New Insights in the Ion Beam Sputtering Deposition of ZnO-Fluoropolymer Nanocomposites

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