Effect of Internal Electron Donors on Butadiene Polymerization Catalyzed by the TiCl4/MgCl2 Ziegler–Natta Catalyst DOI

RunChuan Zhou,

Ang Zhao, Jian Liu

et al.

The Journal of Physical Chemistry C, Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 19, 2024

Ziegler–Natta (ZN) catalysts recognized as mainstream and efficient polymerization reaction are widely used for the of monolefins diolefins due to their excellent properties. The addition electron donors catalyst can effectively improve its regularity. In this article, chelate coordination internal 2,3-dimethyl diethylsuccinate (DES), 2,3-diisopropyl (DIS), 2,2-dimethyl-1,3-dimethoxypropane (DMMP), 2,2-diisopropyl-1,3-dimethoxypropane (DIMP) on support was investigated by density functional theory (DFT). By calculating activation energy before after donor, effect donor stereoselectivity analyzed. results indicate that all four be stably adsorbed onto support, forming closer interactions with adjacent active centers. butadiene insertion process, si configuration is more favorable than re configuration. With DES, DIS, DMMP, DIMP, increased from 0.7 kcal/mol bare center model 0.9, 1.2, 0.8, 1.5 kcal/mol, respectively. Particularly noteworthy fact DIMP showed most pronounced improvement in stereoselectivity.

Language: Английский

A commercially viable solution process to control long-chain branching in polyethylene DOI
Robert D. J. Froese,

Daniel J. Arriola,

Jaap den Doelder

et al.

Science, Journal Year: 2024, Volume and Issue: 383(6688), P. 1223 - 1228

Published: March 14, 2024

In polyolefins, long-chain branching is introduced through an energy-intensive, high-pressure radical process to form low-density polyethylene (LDPE). the current work, we demonstrated a ladder-like architecture solution polymerization of ethylene and less than 1 mole % α,ω-dienes, using dual-chain catalyst. The ladder-branching mechanism requires catalysts with two growing polymer chains on same metal center, thus enchaining diene without requirement steady-state concentration pendant vinyl groups. Molecular weight distributions lacking high-molecular tail, distinctive Mark-Houwink signatures, nuclear magnetic resonance characterization, shear extensional rheology consistent highly branched architectures are described. This approach represents industrially viable solution-polymerization capable producing controlled rheological properties comparable those LDPE or its blends linear (LLDPE).

Language: Английский

Citations

17
Chemical Modification of Oxidized Polyethylene Enables Access to Functional Polyethylenes with Greater Reuse DOI
Jake X. Shi, Nicodemo R. Ciccia, Subhajit Pal

et al.

Journal of the American Chemical Society, Journal Year: 2023, Volume and Issue: 145(39), P. 21527 - 21537

Published: Sept. 21, 2023

Polyethylene is a commodity material that widely used because of its low cost and valuable properties. However, the lack functional groups in polyethylene limits use applications include adhesives, gas barriers, plastic blends. The inertness makes it difficult to install would enhance properties enable programmed chemical decomposition. To overcome these deficiencies, installation pendent imbue with enhanced an attractive strategy inherent limitations. Here, we describe strategies derivatize oxidized contains both ketones alcohols monofunctional variants bulk superior those unmodified polyethylene. Iridium-catalyzed transfer dehydrogenation acetone furnished polyethylenes only ketones, ruthenium-catalyzed hydrogenation hydrogen alcohols. We demonstrate ratio can be controlled by reduction stoichiometric hydride-containing reagents. serve as sites introduce esters oximes onto polymer, thereby improving surface over These were removed hydrolysis regenerate original oxygenated polyethylenes, showing how functionalization lead materials circularity. Waste equally amenable oxidative derivatization material, this low- or negative-value feedstock prepare higher value. Finally, derivatized polymers distinct solubilities separated from mechanically mixed blends selective dissolution, demonstrating novel approaches for distinguishing separating mixture.

Language: Английский

Citations

33
Understanding the Interfacial and Self-Assembly Behavior of Multiblock Copolymers for Developing Compatibilizers toward Mechanical Recycling of Polymer Blends DOI
Tianhang Zhou,

Xiaoqi Ning,

Zhenghao Wu

et al.

Industrial & Engineering Chemistry Research, Journal Year: 2024, Volume and Issue: 63(15), P. 6766 - 6773

Published: April 5, 2024

Multiblock copolymers (MBCPs) constitute a class of materials with distinctive structures and properties. Among MBCPs, linear grafted multiblock emerge as two promising candidates for advancing the development high-performance compatibilizers homopolymer mixtures. However, elucidation underlying mechanisms modulating their behaviors remains an unresolved challenge. Here, we conducted extensive dissipative particle dynamics (DPD) simulations to study compatibilization efficiency micelle formation in terms interfacial tension self-assembly behavior. The all MBCPs increases areal concentration before reaching plateau by reducing unfavorable contact between homopolymers. effect number blocks on is more dominant highly incompatible system high value concentration. We find that there minimal disparity graft weakly systems, whereas difference notable systems. copolymer highest exhibits best among Moreover, common phenomenon after addition due exhibit lower tendency form micelles compared copolymers. Furthermore, size larger than copolymers, suggesting higher possibility phase blend. Our results demonstrate how are likely function compatibilizers, forming behavior well accumulation interface reduce tension. anticipate our work will be starting point sophisticated silico models upcycling waste thermoplastics.

Language: Английский

Citations

4
Fabrication of polypropylene-g-poly(acrylic acid) based microfibers by combination of photo-induced metal-free ATRP and electrospinning process DOI
Gokhan Acik

Journal of Polymer Research, Journal Year: 2024, Volume and Issue: 31(5)

Published: May 1, 2024

Language: Английский

Citations

4
Ethylene polymerization with homogeneous catalysts DOI
Naeimeh Bahri‐Laleh,

Amir Hossein Ghavampoor,

Fereshteh Karkhaneh

et al.

Elsevier eBooks, Journal Year: 2025, Volume and Issue: unknown, P. 49 - 72

Published: Jan. 1, 2025

Language: Английский

Citations

0
Polyolefin based Nano-Objects via ARGET ATRP mediated Polymerization-Induced Self-Assembly process DOI
Xinyue Liang, Jingwei Zhang, Xiaoxiao Wu

et al.

European Polymer Journal, Journal Year: 2025, Volume and Issue: unknown, P. 113906 - 113906

Published: March 1, 2025

Language: Английский

Citations

0
Synthesis of Graft‐Modified Polyolefin Compatibilizers for Compatibilizing Mixed Plastics DOI
Yu Chen, Yuxin Ding, Pei Li

et al.

Chinese Journal of Chemistry, Journal Year: 2025, Volume and Issue: unknown

Published: April 11, 2025

Comprehensive Summary Recycling polyolefin and other plastic mixtures encounters significant obstacles due to the intricate nature economic inefficiencies of physically separating vast streams mixed waste. Incorporating compatibilizers emerges as a viable strategy diminish interfacial energy bolster compatibility, ultimately yielding homogeneous products. In this contribution, polar polyolefins featuring metal dynamic cross‐linking networks were synthesized by tandem polymerizing ionic cluster type monomers olefins. Subsequent treatment with HCl aqueous solution esterification polyester precursors yields high‐performance grafted for polymer compatibilizing. For PP/PC melting blends, adding 5 wt% graft‐modified results in tougher blends that surpass performance corresponding virgin iPP elongation at break (εb). Polar containing sodium carboxylate groups play dual role compatibilizing PET/HDPE acting both nucleating agents. Moreover, enables production comprising ternary polymers, which can be employed blends.

Language: Английский

Citations

0
Challenges and prospects of multilayer plastic waste management in several countries: A systematic literature review DOI Creative Commons
Mayrianti Annisa Anwar, Suprihatin Suprihatin,

Nugroho Adi Sasongko

et al.

Case Studies in Chemical and Environmental Engineering, Journal Year: 2024, Volume and Issue: 10, P. 100911 - 100911

Published: Aug. 28, 2024

This systematic literature review employs the PICOC framework to structure research questions and PRISMA method for comprehensive transparent analysis. The study identifies key strategies manage multilayer plastics effectively, including advanced chemical recycling technologies policy interventions. A European case highlights development application of innovative techniques like solvent-targeted recovery, emphasizing need substantial investment support. underscores global disparity in infrastructure, particularly between developed developing countries, advocates tailored, context-specific solutions advance circular economy principles plastic waste management.

Language: Английский

Citations

3
Tuning the Adhesive Strength of Functionalized Polyolefin-Based Hot Melt Adhesives: Unexpected Results Leading to New Opportunities DOI Creative Commons
Jakub Kruszynski, Weronika Nowicka, Farhan Ahmad Pasha

et al.

Macromolecules, Journal Year: 2025, Volume and Issue: unknown

Published: March 5, 2025

Language: Английский

Citations

0
Large-scale comparison of Fe and Ru polyolefin C–H activation catalysts DOI Creative Commons
Husain Adamji, Ilia Kevlishvili, Aditya Nandy

et al.

Journal of Catalysis, Journal Year: 2024, Volume and Issue: 431, P. 115361 - 115361

Published: Feb. 9, 2024

Language: Английский

Citations

2