Demonstrating the Efficacy of Core-Shell Silica Catalyst in Depolymerizing Polycarbonate DOI Open Access
Onofrio Losito,

Pasquale Pisani,

Alessia De Cataldo

et al.

Polymers, Journal Year: 2024, Volume and Issue: 16(22), P. 3209 - 3209

Published: Nov. 19, 2024

Polycarbonate (PC) is a highly versatile plastic material that extensively utilized across various industries due to its superior properties, including high impact strength and heat resistance. However, durability presents significant challenges for recycling waste management. thermoplastic polymer representative of the class condensation reaction polymers obtained from bisphenol A (BPA) carbonyl source, such as phosgene or alkyl aryl carbonate. The processes PC include mechanical recycling, blending with other materials, pyrolysis, chemical recycling. latter based on cleavage carbonate units their corresponding monomers derivatives through alcoholysis and/or hydrolysis ammonolysis, normally under basic conditions without catalysts. This study investigates efficacy use several heterogeneous catalysts silica gel robust support, Sc(III)silicate (thortveitite), which has been previously reported preparation polyesters, core-shell Si-ILs, Si-ILs-ZnO, never used before in depolymerization polycarbonate, proposing sustainable efficient method this valuable polymer. We chose explore because these are recyclable, have very harsh industrial processes. were characterized by XRD; SEM_EDX, FT-IR, ICP-OES analysis. In our experimental protocol, polycarbonate samples exposed catalyst controlled (60–150 °C, 12–24 h) using both oxygen nitrogen nucleophiles. process was systematically monitored advanced analytical techniques (GC/MS GPC chromatography). results indicated exhibits efficacy, up 75% yield ammonolysis reaction, producing purity. These can be reused synthesis new contributing more approach

Language: Английский

Low-cost high performance sustainable triboelectric nanogenerator based on laboratory waste DOI Creative Commons
Abhisek Panda, Kunal Kumar Das,

Kushal Ruthvik Kaja

et al.

Journal of Metals Materials and Minerals, Journal Year: 2025, Volume and Issue: 35(1), P. e2226 - e2226

Published: Feb. 21, 2025

The production of waste materials in laboratories is an unavoidable consequence diverse experiments and activities. These can range from chemicals, solvents, biological samples to electronic components, glassware, plastics. Typically, this classified into hazardous non-hazardous categories, requiring careful disposal avoid environmental health risks. be repurposed for energy harvesting methods, such as using polymers triboelectric nanogenerators (TENGs) or recycling metallic electrodes. This approach reduces while advancing sustainable solutions. technique demonstrates remarkable efficiency utilizing transform various forms mechanical electricity multiple smart applications. Herein, we have collected several laboratory wastes including used latex gloves, aluminium tape, glass slides, fabricated a single-electrode TENG which produced electrical outputs 220 V voltage, 25 µA current, power 72 μW at 500 MΩ resistance. device was also charge capacitors LED light. Finally, the harvest energies natural source like wind energy, droplet exercise activities, body movement speaking drinking water. kind sustainable, low-cost, easy fabricate very useful applications sensing, biomedical sectors.

Language: Английский

Citations

1
Comparison of Computational Methods for Simulating Depolymerization Reaction DOI Creative Commons

Shunsuke Mieda

ACS Omega, Journal Year: 2025, Volume and Issue: 10(6), P. 5973 - 5980

Published: Feb. 4, 2025

A chemical recycling process that reduces polymers to their raw materials plays a crucial role in circular economy. To contribute recycling, this study proposes system simulates the of depolymerization from polymer-to-monomer using reactive molecular dynamics (MD). Two MD methods, Reax force field (ReaxFF) and neural network potential (NNP), were employed simulate polystyrene model. We validated simulation accuracies by comparing monomer yields decomposition products with experimental results. The results showed NNP-MD accurately replicated degradation redecomposition processes achieved consistency data at various temperatures. ReaxFF-MD, however, was less able represent process. conclude is capable simulating polymer are consistent observations. These development methods for efficient broader realization

Language: Английский

Citations

0
Ultrafast Thermal RAFT Depolymerization at Higher Solid Contents DOI Creative Commons

Dimitra Mantzara,

Richard Whitfield, Hyun Suk Wang

et al.

ACS Macro Letters, Journal Year: 2025, Volume and Issue: unknown, P. 235 - 240

Published: Feb. 10, 2025

Although thermal solution RAFT depolymerization has recently emerged as an efficient chemical recycling methodology, current approaches require specialized solvents (i.e., dioxane), typically suffer from extended reaction times, and operate exclusively under highly dilute conditions 5 mM repeat unit concentration). To circumvent these limitations, a commercial radical initiator is introduced to kinetically untrap the promote chain-end activation. By varying concentration, remarkable rate acceleration (up 72 times faster) can be observed, enabling completion of within min. Notably, 20-fold increase in concentration did not appreciably compromise final yield, while very high percentages monomer could recovered wide range solvents, including dimethyl sulfoxide, anisole, xylene, acetonitrile, toluene, trichlorobenzene. Our findings only offer intriguing mechanistic aspects, but also significantly expand scope applications depolymerization.

Language: Английский

Citations

0
Aliphatic–Aromatic Copolyesters with Waste-Sourceable Multiple Chain-Length Building Blocks DOI Creative Commons
Dario Rothauer, Stefan Mecking, Taylor F. Nelson

et al.

ACS Sustainable Chemistry & Engineering, Journal Year: 2025, Volume and Issue: 13(8), P. 3280 - 3288

Published: Feb. 19, 2025

Sourcing commodity polymers from sustainable alternative feedstocks, such as those derived plastic waste or biobased resources, is a promising approach to alleviate the reliance on finite fossil fuel stocks for production of virgin plastics. Linear aliphatic dicarboxylic acids multiple chain lengths can be obtained polyethylene (PE) waste, and their use in synthesis polyesters has recently been demonstrated. To improve materials' properties chain-length dicarboxylates, we herein combined this feedstock with terephthalate an aromatic monomer unit yield aliphatic-aromatic copolyesters. We established structure-property relationships copolyesters dicarboxylates (C4-C20) model catalytic oxidation products PE 1,18-octadecanedioate reference materials single, long length dicarboxylates. Thermal solid-state structures were dominated by ratio units rather than identity dicarboxylate diol components. demonstrated upscaling copolyester synthesis, well processability mechanical copolyester, which showed comparable commercial polybutylene adipate-co-terephthalate. Finally, via transesterification thus postmodification premade polyesters, including postconsumer terephthalate, sources.

Language: Английский

Citations

0
Backbone Degradable Polymers via Chain-growth Radical Polymerization DOI
Haiwang Lai, Makoto Ouchi

Chinese Journal of Polymer Science, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 24, 2025

Language: Английский

Citations

0
Dual Feedstock Upcycling of α-Methylstyrene-Doped Poly(methyl methacrylate) and Biomass via the Telescope of Depolymerization and Diels–Alder Reaction DOI Creative Commons
Rui Zhang,

Mason T. Chin,

Tianning Diao

et al.

Organic Letters, Journal Year: 2025, Volume and Issue: unknown

Published: April 2, 2025

Nearly 90% of poly(methyl methacrylate) (PMMA) is not recycled and instead ends up in landfills. Conventional pyrolysis PMMA recovers impure methyl methacrylate (MMA) with low economic value. Here, we present a telescoped dual upcycling strategy that integrates depolymerization, Diels-Alder cycloaddition, aromatization to convert AMS-doped biomass-derived 2,5-dimethylfuran (DMF) into 1,2,4-trimethylbenzene (pseudocumene), valuable chemical feedstock. BBr3 proved effective promoting the challenging reaction between MMA DMF under high pressure argon.

Language: Английский

Citations

0
Release of Microplastics During Dental Procedures and Denture Wear: Impact on Dental Personnel and Patients DOI
Yan Chen, Jianmin Chen,

Jingyao Guo

et al.

Journal of Hazardous Materials, Journal Year: 2025, Volume and Issue: unknown, P. 138463 - 138463

Published: May 1, 2025

Language: Английский

Citations

0
Demonstrating the Efficacy of Core-Shell Silica Catalyst in Depolymerizing Polycarbonate DOI Open Access
Onofrio Losito,

Pasquale Pisani,

Alessia De Cataldo

et al.

Polymers, Journal Year: 2024, Volume and Issue: 16(22), P. 3209 - 3209

Published: Nov. 19, 2024

Polycarbonate (PC) is a highly versatile plastic material that extensively utilized across various industries due to its superior properties, including high impact strength and heat resistance. However, durability presents significant challenges for recycling waste management. thermoplastic polymer representative of the class condensation reaction polymers obtained from bisphenol A (BPA) carbonyl source, such as phosgene or alkyl aryl carbonate. The processes PC include mechanical recycling, blending with other materials, pyrolysis, chemical recycling. latter based on cleavage carbonate units their corresponding monomers derivatives through alcoholysis and/or hydrolysis ammonolysis, normally under basic conditions without catalysts. This study investigates efficacy use several heterogeneous catalysts silica gel robust support, Sc(III)silicate (thortveitite), which has been previously reported preparation polyesters, core-shell Si-ILs, Si-ILs-ZnO, never used before in depolymerization polycarbonate, proposing sustainable efficient method this valuable polymer. We chose explore because these are recyclable, have very harsh industrial processes. were characterized by XRD; SEM_EDX, FT-IR, ICP-OES analysis. In our experimental protocol, polycarbonate samples exposed catalyst controlled (60–150 °C, 12–24 h) using both oxygen nitrogen nucleophiles. process was systematically monitored advanced analytical techniques (GC/MS GPC chromatography). results indicated exhibits efficacy, up 75% yield ammonolysis reaction, producing purity. These can be reused synthesis new contributing more approach

Language: Английский

Citations

0