Energy & Fuels, Год журнала: 2025, Номер unknown
Опубликована: Март 14, 2025
Язык: Английский
Polymer Testing, Год журнала: 2024, Номер 131, С. 108351 - 108351
Опубликована: Янв. 30, 2024
The accurate characterization of post-consumer recycled (PCR) polyethylene (PE) and polypropylene (PP) blends is essential for repurposing them into higher-demand applications. This study improves the accuracy Temperature Rising Elution Fractionation coupled with Gel Permeation Chromatography (TREFxGPC) approach both virgin PP/PE blends. Model polymers were used to estimate polymer-specific IR-detector response factors. Moreover, a correction molecular weight-dependent amount PP eluting in TREF temperature range characteristic PE was found. Accounting these factors improved results method, reducing error composition determination from 8 % 2 %. Therefore, our provides better quantitative assessment capabilities Furthermore, refined TREFxGPC not only reliably determines PCR blend but also reveals their bivariate weight chemical distribution (MWD-CCD). Understanding full microstructure enables can lead superior products, enabling use more demanding
Язык: Английский
Процитировано
7
Advanced Functional Materials, Год журнала: 2024, Номер 34(34)
Опубликована: Март 30, 2024
Abstract The development of multifunctional bio‐based materials with closed‐loop chemically recyclable plastics can be a paramount response to the worldwide plastic waste predicament. However, trade‐off dilemma between high performance and easy recycling these still encounters huge challenges. In this contribution, inspired by significant contribution hydrogen bonding networks enhanced mechanical gas barrier as well cosolvents enhance performance, novel polyester material (PBH y F) synthesized monomers that integrate high‐performance efficient chemical is presented. PBH F show ultra‐high properties (83.2 MPa, 233.9%) (CO 2 0.0157 barrer, O 0.0071 H 5.518E‐15 g·cm/cm ·s·Pa) are greater than most engineering previous work. More significantly, also exhibits multifunctionality excellent ultraviolet shielding properties, solvent‐resistant performance. initial obtained in exceptional yields (>90.0%) purity (>99.0%) under mild conditions simple energy‐efficient rapid chemical‐solvolysis strategy, even polyolefin blend plastics. Further possesses similar repolymerized comparable before recycling. Hence, state‐of‐art easy‐recycling provide new approach for green, sustainable economy.
Язык: Английский
Процитировано
7
Angewandte Chemie International Edition, Год журнала: 2024, Номер 63(26)
Опубликована: Апрель 22, 2024
Catalytic upcycling of polyolefins into high-value chemicals represents the direction in end-of-life plastics valorization, but poses great challenges. Here, we report synthesis a tandem porous catalyst via micelle cascade assembly strategy for selectively catalytic cracking polyethylene olefins at low temperature. A hierarchically silica layer from mesopore to macropore is constructed on surface microporous ZSM-5 nanosheets through dynamic micelles. The outer arrays can adsorb bulky quickly by capillary and hydrophobic effects, enhancing diffusion access active sites. middle mesopores present nanoconfinement space, pre-cracking intermediates weak acid sites, which then transport zeolites micropores further strong Brønsted acidic structures, mimicking biomimetic protease clefts, ideally match steps polyolefins, thus suppressing coke formation facilitating product escape. As result, light hydrocarbons (C
Язык: Английский
Процитировано
7
Advanced Energy Materials, Год журнала: 2024, Номер 14(41)
Опубликована: Июль 9, 2024
Abstract Arbitrary disposal of plastic waste into landfills and oceans can disturb the ecological system even challenge human survival. Centralized recycling process only works for selected types plastics (e.g., polyethylene) with limited contribution (<10%), because high infrastructure requirement. Comparatively, photoreforming commodity fuels production is much more facile decentralizable, thus holds great potential to mitigate challenge. To this end, a fully solar powered photoelectrochemical developed selectively upgrade polyimide (often appears in electronic waste) valuable chemicals, including succinic acid, acetic formic cogenerating green hydrogen fuels. It also demonstrated that one key monomer, pyromellitic precious metals (in be recycled. This proof‐of‐concept demonstration provides new viewpoint designing decentralized simultaneous upcycling renewable fuel synthesis, critical sustainable economy. Selective cleavage benzene ring opens route other ring‐containing upgrading.
Язык: Английский
Процитировано
6
Angewandte Chemie, Год журнала: 2023, Номер 135(51)
Опубликована: Окт. 30, 2023
Abstract Polyethylene (PE) is the most widely produced synthetic polymer. By installing chemically cleavable bonds into backbone of PE, it possible to produce deconstructable PE derivatives; date, however, such designs have primarily relied on carbonyl‐ and olefin‐related functional groups. Bifunctional silyl ethers (BSEs; SiR 2 (OR′ )) could expand scope mimics as they possess strong Si−O facile chemical tunability. Here, we report BSE‐containing high‐density polyethylene (HDPE)‐like materials synthesized through a one‐pot catalytic ring‐opening metathesis polymerization (ROMP) hydrogenation sequence. The crystallinity these can be adjusted by varying BSE concentration or steric bulk Si‐substituents, providing handles control thermomechanical properties. Two methods for recycling HDPE are introduced, including circular approach that leverages acid‐catalyzed bond exchange with 1‐propanol. Additionally, despite fact starting were chain‐growth (ROMP), show recover molar mass dispersity recycled products using step‐growth formation exchange, generating high molecular weight mechanical properties similar commercial HDPE.
Язык: Английский
Процитировано
13
The Science of The Total Environment, Год журнала: 2024, Номер 916, С. 170185 - 170185
Опубликована: Янв. 20, 2024
Язык: Английский
Процитировано
5
Environmental Science & Technology, Год журнала: 2024, Номер 58(19), С. 8336 - 8348
Опубликована: Май 4, 2024
The growing environmental consequences caused by plastic pollution highlight the need for a better understanding of polymer cycles and their associated additives. We present novel, comprehensive top-down method using inflow-driven dynamic probabilistic material flow analysis (DPMFA) to map cycle in coastal countries. For first time, we covered progressive leaching microplastics environment during use phase products modeled presence 232 applied this methodology Norway proposed initial release pathways different compartments. 758 kt plastics distributed among 13 polymers was introduced Norwegian economy 2020, 4.4 Mt in-use stocks, 632 wasted, which 15.2 (2.4%) released with similar share macro- 4.8 ended up ocean. Our study shows tire wear rubber as highly pollutive microplastic source, while most macroplastics originated from consumer packaging LDPE, PP, PET dominant polymers. Additionally, 75 additives potentially alongside these emphasize that upstream measures, such consumption reduction changes product design, would result positive impact limiting pollution.
Язык: Английский
Процитировано
4
Polymer Bulletin, Год журнала: 2024, Номер 81(13), С. 12243 - 12265
Опубликована: Май 13, 2024
Язык: Английский
Процитировано
4
Science Advances, Год журнала: 2024, Номер 10(21)
Опубликована: Май 23, 2024
Polyolefins are the most widely used plastics accounting for a large fraction of polymer waste stream. Although reusing polyolefins seems to be logical choice, their recycling level remains disappointingly low. This is mainly due lack large-scale availability efficient and inexpensive compatibilizers mixed polyolefin waste, typically consisting high-density polyethylene (HDPE) isotactic polypropylene (
Язык: Английский
Процитировано
4
Journal of Analytical and Applied Pyrolysis, Год журнала: 2024, Номер 181, С. 106592 - 106592
Опубликована: Июнь 19, 2024
Язык: Английский
Процитировано
4