Approaches to Sustainable and Continually Recyclable Cross-Linked Polymers

ACS Sustainable Chemistry & Engineering, Год журнала: 2018, Номер 6(9), С. 11145 - 11159

Опубликована: Авг. 26, 2018

Cross-linked polymers are ubiquitous in daily life, finding applications as tires, insulation, adhesives, automotive parts, and countless other products. The covalent cross-links these materials render them mechanically robust, chemically resistant, thermally stable, but they also prevent recycling of into similar-value goods. Furthermore, cross-linked typically produced from petroleum-based feedstocks, their hydrocarbon backbones nondegradable, making unsustainable the long term. In recent years, much effort has focused on development strategies for polymeric materials. following Perspective, we discuss many approaches, highlight efforts to sustainably produce recyclable polymers. We present our thoughts future challenges that must be overcome enable widespread, viable, more sustainable practical implementation materials, including sourcing long-term environmental stability inherently dynamic polymers, moving toward industrially viable synthesis reprocessing methods.

Язык: Английский

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Plastics recycling with a difference

Science, Год журнала: 2018, Номер 360(6387), С. 380 - 381

Опубликована: Апрель 26, 2018

A novel plastic with useful properties can easily be recycled again and

Язык: Английский

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Current technologies for plastic waste treatment: A review

Journal of Cleaner Production, Год журнала: 2020, Номер 282, С. 124523 - 124523

Опубликована: Окт. 27, 2020

Язык: Английский

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Bio-based and biodegradable polymers - State-of-the-art, challenges and emerging trends

Current Opinion in Green and Sustainable Chemistry, Год журнала: 2019, Номер 21, С. 75 - 81

Опубликована: Дек. 19, 2019

Язык: Английский

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50th Anniversary Perspective: Living Polymerization—Emphasizing the Molecule in Macromolecules

Macromolecules, Год журнала: 2017, Номер 50(18), С. 6979 - 6997

Опубликована: Сен. 17, 2017

The ideal of living polymerization has defined research in polymer chemistry over the past 50 years. In this Perspective, we present case that concept enabled treatment polymers as organic molecules, rather than impure mixtures species, and allowed translation methods developed by synthetic chemists into ever more accessible and/or controlled methods. concurrent development rapid analytical for screening new characteristics, chiefly size exclusion chromatography, greatly aided expansion

Язык: Английский

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Reprocessable Acid-Degradable Polycarbonate Vitrimers

Macromolecules, Год журнала: 2018, Номер 51(2), С. 389 - 397

Опубликована: Янв. 4, 2018

Vitrimers are cross-linked polymer networks containing linkages that undergo thermally activated, associative exchange reactions, such the cross-link density and overall network connectivity preserved. Polycarbonates industrially relevant polymers that, to our knowledge, have not yet been explored as vitrimers. We developed hydroxyl-functionalized polycarbonate transcarbonation reactions at elevated temperatures in presence of catalytic Ti(IV) alkoxides. The rate within networks, estimated through stress relaxation experiments, was tuned by adjusting catalyst loading or hydroxyl group concentration networks. exhibit recovery their tensile strength plateau storage modulus (71–133%) after reprocessing. In addition being reprocessable, were hydrolyzed decarboxylated aqueous acid recover 80 wt % precursor bifunctional cyclic carbonate monomer. These observations demonstrate PC vitrimers a novel class strong, repairable with more facile end-of-life degradation compared other conventional thermosets. characteristics, along high likelihood deriving monomers from bio-based sources, make outstanding candidates for sustainable manufacture use.

Язык: Английский

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Toward Infinitely Recyclable Plastics Derived from Renewable Cyclic Esters

Chem, Год журнала: 2018, Номер 5(2), С. 284 - 312

Опубликована: Ноя. 15, 2018

Язык: Английский

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Sustainable polymers from biomass: Bridging chemistry with materials and processing

Progress in Polymer Science, Год журнала: 2019, Номер 101, С. 101197 - 101197

Опубликована: Дек. 16, 2019

Язык: Английский

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Vitrimers Designed Both To Strongly Suppress Creep and To Recover Original Cross-Link Density after Reprocessing: Quantitative Theory and Experiments

Macromolecules, Год журнала: 2018, Номер 51(15), С. 5537 - 5546

Опубликована: Июль 17, 2018

Vitrimers form a promising class of dynamic polymer networks, but they have an Achilles' heel: elastomeric vitrimers exhibit significant creep under conditions where permanently cross-linked, networks little or no creep. We demonstrate that can be designed with strongly suppressed and excellent reprocessability by incorporating substantial yet subcritical fraction permanent cross-links. This critical cross-links, which has detrimental effect on reprocessability, is defined the gelation point only cross-links leading to percolated network. Via modification classic Flory–Stockmayer theory, we developed simple theory quantitatively predicts approximate limiting fraction. To test our controlled fractions based thiol–epoxy click chemistry. characterized rubbery plateau modulus before after reprocessing as well stress relaxation original vitrimers. Our experimental results support theoretical prediction: long insufficient network, vitrimer reprocessed full recovery cross-link density. In particular, predicted 50 mol %, system 40 % achieved property associated density 65–71% reduction (for both samples) relative similar without contrast, 60 could not into well-consolidated sample, nor did it recover density; failed breaking at early stages tests. The ability predict enhanced resistance represents important advance in science design

Язык: Английский

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The Chemical Recycling of Polyesters for a Circular Plastics Economy: Challenges and Emerging Opportunities

ChemSusChem, Год журнала: 2021, Номер 14(19), С. 4041 - 4070

Опубликована: Апрель 7, 2021

Abstract Whilst plastics have played an instrumental role in human development, growing environmental concerns led to increasing public scrutiny and demands for outright bans. This has stimulated considerable research into renewable alternatives, more recently, the development of alternative waste management strategies. Herein, aim was highlight recent developments catalytic chemical recycling two commercial polyesters, namely poly(lactic acid) (PLA) poly(ethylene terephthalate) (PET). The concept is first introduced, associated opportunities/challenges are discussed within context governing depolymerisation thermodynamics. Chemical methods PLA PET then discussed, with a particular focus on upcycling use metal‐based catalysts. Finally, attention shifts emergence new materials potential modernise economy. Emerging opportunities challenges industrial feasibility.

Язык: Английский

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