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

Amphiphilic fibers based on polypropylene-g-poly(acrylic acid) by sequential photo-induced metal-free ATRP and electrospinning DOI Creative Commons
Gokhan Acik

Research Square (Research Square), Journal Year: 2024, Volume and Issue: unknown

Published: March 8, 2024

Abstract Undoubtedly, with the increasing awareness of scientific community and public, current trends are directing research to implement effective combined yet nature friendly methodologies. Due advantages such as adaptability versatility, combination electrospinning light is increasingly intriguing. This study proposes a new strategy for producing amphiphilic fibers from graft copolymer polypropylene (PP) poly (acrylic acid) (FPP- g -PAA). The first step includes synthesis containing PP main chain (tertiary butyl acrylate) pendant groups (PP- -PAA) via photo-induced metal-free ATRP (PIMF-ATRP) tertiary acrylate ( t -BA) monomer chlorinated (PP-Cl) macro photo-initiator followed by acidolysis -BA units acrylic acid moieties. In second step, PP- -PAA successful electrospun fabricate ultimate fibers. chemical steps monitored confirmed Fourier-transform infrared (FT-IR) proton magnetic resonance 1 H-NMR) spectroscopies, gel permeation chromatography (GPC). Following structural characterization, morphological wetting properties systematically determined scanning electron microscopy (SEM) water contact angle (WCA) measurement depending on surface characteristics samples. Thermal behaviour precursors synthesized has also been evaluated compared thermogravimetric analysis (TGA) differential calorimetry (DSC). SEM images display that achieved were smooth circular average diameters ranging 3.3 µm up 3.9 µm. After WCA measurements, it was elucidated hydrophobic -P BA transformed into structure hydrolysis P groups. reported approach very encouraging expected trigger further development scientists preparing various types polyolefin fiber based materials.

Language: Английский

Citations

0
Preparation of oxidized polyethylene wax from polyethylene wax by SCCO2-assisted foam method: structural characteristics, reaction mechanism and properties DOI

Wen-Huan Qiao,

Peng Gao,

Shao-Kang Qian

et al.

Journal of Polymer Research, Journal Year: 2024, Volume and Issue: 31(4)

Published: March 30, 2024

Language: Английский

Citations

0
p-Aryl-Substituted Iminopyridine Chromium Complexes as Precatalysts for Ethylene Polymerization: The Question of the Physical Oxidation State Examined by Experimental and Density Functional Study in the Absence of Structural Data DOI
Giorgia Zanchin, Alessia Amodio, Alessandro Piovano

et al.

Organometallics, Journal Year: 2024, Volume and Issue: 43(20), P. 2537 - 2547

Published: Sept. 19, 2024

Language: Английский

Citations

0
Reversible Adhesive Film with Ultralow Dielectric Loss in High Frequency via Surface Anchoring of Catechol DOI
Jiading Wang, Ruikun Wang, Shengqiang Nie

et al.

ACS Applied Materials & Interfaces, Journal Year: 2024, Volume and Issue: unknown

Published: Sept. 27, 2024

Debonding of the dielectric adhesive material will make high-frequency communication equipment unusable, leading to resource wasting and electronic waste. Reversible is an ideal strategy realize reuse debonding devices, but low loss requirement materials in devices limits its development. Here, surface anchoring design catechol was proposed prepare a reversible film with ultralow high frequency. The structure linked end polybutadiene (PB) macromolecule synthesize catechol-terminated PB (PB-D). PB-based (PB-F) used as base film, then PB-D sprayed on PB-F form thin layer. In subsequent curing process, group could be anchored by cross-linking reaction between heterogeneous segments. modification transforms interface copper foil into cohesive failure within layer, showing strong adhesion more than 1.1 N/mm. More importantly, relying hydrogen bonding structures, can regain stable mild way. Because only distributed surface, kept (

Language: Английский

Citations

0
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

Citations

0