Preparation of High-Performance Polyethylene Nanocomposites with Oleic Acid–Siloxene-Supported Ziegler–Natta Catalysts

Molecules, Journal Year: 2024, Volume and Issue: 29(15), P. 3662 - 3662

Published: Aug. 2, 2024

The addition of two-dimensional inorganic nanomaterials can effectively enhance the properties polyethylene (PE). In present study, a series high-performance PE/oleic acid (OA)-siloxene nanocomposites were prepared by in situ polymerization using OA-siloxene-supported Ziegler-Natta catalysts. Compared with conventional catalyst, activity catalyst was enhanced to 100 kg/mol-Ti•h, an increase 56%. OA-siloxene fillers exhibited excellent dispersion within PE matrix through technique. pure PE, PE/OA-siloxene containing 1.13 wt% content showed 68.3 °C, 126%, 37%, and 46% enhancements

Language: Английский

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Comb Polybutadiene with Long Polystyrene Side Chains: A Solution for Tunable Flowability and Enhancing Dielectric Properties in High-Frequency Printed Board Adhesive Films

ACS Applied Materials & Interfaces, Journal Year: 2023, Volume and Issue: 15(34), P. 41019 - 41030

Published: Aug. 15, 2023

Liquid high-vinyl polybutadiene (PB) possessed excellent dielectric properties, rendering them suitable candidates for adhesive films of high-frequency printed boards. However, their inherent low molecular weights resulted in chain slippage and overflow during processing, thereby diminishing the performance films. To address this challenge, we synthesized comb PB with long polystyrene side chains via reversible addition-fragmentation transfer (RAFT) polymerization, effectively immobilizing backbone restricting relative slippage. Controlling length number "comb teeth" (styrene chains) efficiently regulated flowability PB, achieving distinct flow states. Simultaneously, dynamics simulations revealed that elongated inflexible could create minuscule cavities, which impeded close packing molecules led to constants (2.39/2.01, 1 MHz/10 GHz) ultralow losses (0.0071/0.0016, GHz). Furthermore, a series circuit boards were fabricated using film, signal loss was significantly reduced 48.8% (19 comparison commercial epoxy adhesive. This study demonstrated potential achieve desirable properties by introducing tangles, large volume resistance, microporosity compared block structures.

Language: Английский

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Copolymerization of Ethylene With Polar Monomers by Group 4 Catalysts

Polymer Reviews, Journal Year: 2024, Volume and Issue: unknown, P. 1 - 60

Published: Dec. 24, 2024

The research of copolymerization ethylene with polar monomers catalyzed by group 4 metal complexes has gain substantial achievement, and the functional polyolefins, produced through various structures catalysts monomers, have already shown their unique applications in multiple fields. There are kinds effective strategies to improve activity incorporation: been expanded from metallocenes half-metallocenes non-metallocenes; new cocatalysts catalytic systems developed; pretreated masking agents; groups largely enriched. In this review, concluded compared, we looking forward summarizing relationship between structure reactivity providing advice for design catalysts. Moreover, properties potential functionalized polyolefins introduced.

Language: Английский

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Study on Temperature-Controlled Branching Behavior with Self-Condensing Atom Transfer Radical Copolymerization of Latent Inimer and Styrene

Macromolecules, Journal Year: 2023, Volume and Issue: 56(23), P. 9725 - 9737

Published: Nov. 23, 2023

The synthesis of well-defined branched polymers remains a challenge in macromolecular engineering. In the present study, we designed polystyrenes (BPS) by combining self-condensing atom transfer radical copolymerization (ATRP) and Diels–Alder (DA)/retro-Diels–Alder (r-DA) reactions. This "one-pot" strategy for structure-controlled BPS was performed through programmed heating "latent" inimer (FBiBPMI), containing furan-protected maleimide monomer with haloalkane initiator. When polymerization temperature increased from 50 to 110 °C, end groups (furan addition FBiBPMI) linear were converted "real" macromonomers after releasing (MI) via r-DA reaction, then they copolymerized styrene ATRP. Results showed that exhibited well-controlled long branching chains higher degree (g′ = 0.18) lower Rg/Rh compared random polystyrene. Due dynamic characteristic release naked MI subsequent can be regulated reaction temperatures 70, 90, °C. Thus, control polymer morphologies such as polystyrene controllable chain, polystyrene, star-shaped successfully realized induction. Interestingly, various obtained at different distinctive rheological behaviors melt solution. more spherical, three-dimensional structure viscosity faster relaxation time due reduced entanglement between chains, thereby significantly reducing resins.

Language: Английский

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Design, Synthesis and Actual Applications of the Polymers Containing Acidic P–OH Fragments: Part 1. Polyphosphodiesters

International Journal of Molecular Sciences, Journal Year: 2022, Volume and Issue: 23(23), P. 14857 - 14857

Published: Nov. 28, 2022

Among natural and synthetic polymers, main-chain phosphorus-containing polyacids (PCPAs) (polyphosphodiesters), stand in a unique position at the intersection of chemistry, physics, biology medicine. The structural similarity polyphosphodiesters PCPAs to nucleic teichoic acids, their biocompatibility, mimicking biomolecules providing ‘stealth effect’, high bone mineral affinity resulting biomineralization physiological conditions, adjustable hydrolytic stability are basis for various biomedical, industrial household applications this type polymers. In present review, we discuss synthesis, properties actual polyphosphodiesters.

Language: Английский

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Versatile Production of Multivariate, Hyperdimensional End Group and Main Chain Functionalized Polyolefins

Angewandte Chemie International Edition, Journal Year: 2023, Volume and Issue: 62(31)

Published: May 30, 2023

The (stereoselective) living coordinative copolymerization of 1-alkenes with 4-aryl-1,6-heptadienes, in both the absence and presence multiple equivalents a reversible chain transfer agent, is established as highly versatile strategy for production multivariate hyperdimensional functionalized semi-crystalline or amorphous polyolefins that optionally possess either mono- difunctionalized (telechelic) end-groups combination programmable level incorporation orthogonal functional groups within main-chain. non-conjugated diene comonomers are readily obtained from diverse range aryl carboxaldehyde precursors through one-step bis-allylation process. These results serve to provide new platform exploring science technology vast landscape classes now accessible practical scalable quantities.

Language: Английский

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Current Trends in the Synthesis of Inorganic and Organoelement Phosphorus- and Sulfur-Containing Polymers. A Review

Doklady Chemistry, Journal Year: 2023, Volume and Issue: 512(1), P. 217 - 231

Published: Sept. 1, 2023

Abstract An analysis of literature data on the set reactions for production macromolecules with a high content phosphorus and sulfur has been carried out, basic approaches that allow introduction these elements into composition polymers polymeric materials have considered in compliance fundamental principles green chemistry. Methods synthesis functional under mild conditions require minimal energy input from external sources, which can become new growth points industrial technologies, are considered. Particular attention focuses polyphosphazenes polyphosphoesters biomedical purposes, as well inverse vulcanization reaction to give used sorption wastewater treatment, creation current IR optics.

Language: Английский

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Oxygenated groups enriched polyolefin-Zr(IV) complexes catalyzing low-temperature transfer hydrogenation of biomass-derived furfural with 2-propanol

Fuel, Journal Year: 2023, Volume and Issue: 357, P. 129864 - 129864

Published: Sept. 22, 2023

Language: Английский

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Amphiphilic Fibers Based on Polypropylene-G-Poly(Acrylic Acid) by Sequential Photo-Induced Metal-Free Atrp and Electrospinning

Published: Jan. 1, 2024

This study proposes a strategy for producing amphiphilic fibers from graft copolymer of polypropylene (PP) and poly (acrylic acid) (FPP-g-PAA). The first step includes the synthesis containing PP main-chain (tertiary-butyl acrylate) pendant groups (PP-g-PAA) via photo-induced metal-free ATRP (PIMF-ATRP) tertiary butyl acrylate (t-BA) monomer with chlorinated (PP-Cl) as macro photo-initiator followed by acidolysis t-BA units to acrylic acid moieties. In second step, PP-g-PAA is electrospun fabricate ultimate fibers. 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 nature PP-g-PtBA transformed into structure hydrolysis PtBA groups. reported approach encouraging expected trigger further development scientists preparing various types polyolefin fiber materials

Language: Английский

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

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

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