Depolymerization of waste poly(methyl methacrylate) scraps and purification of depolymerized products

Godiya, Chirag B.; Gabrielli, Serena; Materazzi, Stefano; Pianesi, Maria Savina; Stefanini, Nicola; Marcantoni, Enrico

doi:10.1016/j.jenvman.2018.10.116

Cited by 83 publications

(59 citation statements)

References 59 publications

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“…However, it is well-established in the literature (as discussed above) that the thermally-triggered homolytic cleavage with the formation of radicals is the main decomposition pathway of PMMA upon calcination under inert atmosphere. 43,44 Taking into account the all above mentioned in situ analyses, simplified picture of PMMA-depolymerisation driven reduction can be proposed. (Figure 4a); it is correlated to the morphological evolution of particles tracked by in situ TEM in the Figure 4.…”

Section: The Reduction Pathway By Radical Depolymerisation Correlated To In Situ Stemmentioning

confidence: 99%

Aerosol synthesis of thermally stable porous noble metals and alloys by using bi-functional templates

et al. 2020

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Section: The Reduction Pathway By Radical Depolymerisation Correlated To In Situ Stemmentioning

confidence: 99%

Aerosol synthesis of thermally stable porous noble metals and alloys by using bi-functional templates

et al. 2020

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“…Even though feedstock recycling of PMMA through pyrolysis is a well-established method [ 42 , 43 ], the purity of the material obtained may be affected by the presence of water and the composition of the scrap used [ 44 ]. Therefore, acrylic produced from it may present inferior properties compared to that prepared from neat MMA [ 45 , 46 ]. Better control of the uniformity of the sheets thickness, as the glass molds were hold against rigid metal surfaces.…”

Section: Introductionmentioning

confidence: 99%

Characterization and Long-Term Stability of Historical PMMA: Impact of Additives and Acrylic Sheet Industrial Production Processes

et al. 2020

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This work aims at understanding the influence of the production processes and materials in the properties and long term behavior of acrylic sheet, i.e., poly(methyl methacrylate) (PMMA), a material generally considered very stable in museum collections. A comparative study was conducted in samples from cast acrylic sheets produced in the early 2000s, from which manufacturing details were known, and samples provided by the artist Lourdes Castro from acrylic sheets she had bought in the 1960s. Transparent and red opaque cast acrylic samples, containing cadmium red pigment, were used. All samples were artificially aged in a solarbox with irradiation λ > 300 nm for a total period of 8000 h, and alterations were followed by a multi-analytical approach which included Raman, infrared (FTIR-ATR) and UV-Vis spectroscopies; gravimetry; size exclusion chromatography (SEC); thermogravimetry (TGA); micro-indentation; colorimetry; and optical microscopy. Not all cast PMMA sheets presented similar stabilities. We have concluded that the production processes (which may include the polymerization conditions, the organic additives and the origin of the monomer) play a more important role in the properties and long-term behavior of these acrylic sheets than the presence of cadmium red and/or the age of the material.

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“…PMMA, also known as acrylic, is a transparent thermoplastic, although it is often technically classified as a type of glass. Godiya et al [ 74 ] studied thermal pyrolysis of PMMA to produce its monomer methyl methacrylate in high yield. Ouchi [ 75 ] and his group studied the depolymerization of a chlorine-capped polymethyl methacrylate (PMMA-Cl) at temperatures of >100 °C.…”

Section: Polymer Depolymerization Methodsmentioning

confidence: 99%

Current Technologies in Depolymerization Process and the Road Ahead

Jouanne

Yokochi

2021

Polymers

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Although plastic is considered an indispensable commodity, plastic pollution is a major concern around the world due to its rapid accumulation rate, complexity, and lack of management. Some political policies, such as the Chinese import ban on plastic waste, force us to think about a long-term solution to eliminate plastic wastes. Converting waste plastics into liquid and gaseous fuels is considered a promising technique to eliminate the harm to the environment and decrease the dependence on fossil fuels, and recycling waste plastic by converting it into monomers is another effective solution to the plastic pollution problem. This paper presents the critical situation of plastic pollution, various methods of plastic depolymerization based on different kinds of polymers defined in the Society of the Plastics Industry (SPI) Resin Identification Coding System, and the opportunities and challenges in the future.

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Depolymerization of waste poly(methyl methacrylate) scraps and purification of depolymerized products

Cited by 83 publications

References 59 publications

Aerosol synthesis of thermally stable porous noble metals and alloys by using bi-functional templates

Aerosol synthesis of thermally stable porous noble metals and alloys by using bi-functional templates

Characterization and Long-Term Stability of Historical PMMA: Impact of Additives and Acrylic Sheet Industrial Production Processes

Current Technologies in Depolymerization Process and the Road Ahead

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