Chemical Research in Chinese Universities, Journal Year: 2023, Volume and Issue: 39(5), P. 726 - 730
Published: July 3, 2023
Language: Английский
Journal of the American Chemical Society, Journal Year: 2024, Volume and Issue: 146(10), P. 6837 - 6845
Published: March 1, 2024
The efficient synthesis of polar-functionalized polypropylenes with high molecular weight and stereoregularity represents a challenging task. This challenge becomes even more daunting when pursuing an industrially preferred heterogeneous process. study demonstrated the realization these goals through use commercial Ziegler–Natta catalysts in copolymerization propylene ionic cluster polar monomers. results revealed activity (∼1.1 × 107 g mol–1 h–1), moderate monomer incorporation ratios (∼4.9 mol %), copolymer (Mw > 105 mol–1), ([mmmm] ∼ 96%), melting temperature range (150–162 °C). utilization monomers improved thermal stability as well stereoselectivity catalyst. Moreover, catalyst can homopolymerize activities (>104 h–1). resulting isotactic (iPP) exhibited superior tensile strength, impact creep resistance, transparency, crystallinity compared nonpolar iPP. enhancement was attributable to dual roles unit, serving both transparent nucleating agent dynamic cross-linking functionality. Furthermore, iPP compatibility materials, offering benefits for applications composites, recycling mixed plastic wastes, 3D printing, other fields. offered comprehensive solution future industrial production via copolymerization, bridging gap between practical process from synthetic chemistry perspective enhanced material properties application perspective.
Language: Английский
Citations
13
Polymer Chemistry, Journal Year: 2024, Volume and Issue: 15(7), P. 631 - 638
Published: Jan. 1, 2024
By introducing soluble and supported Lewis acids, homogeneous heterogeneous nickel-catalyzed ethylene (co)polymerization was designed studied.
Language: Английский
Citations
4
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
Angewandte Chemie International Edition, Journal Year: 2024, Volume and Issue: unknown
Published: Nov. 2, 2024
The direct synthesis of polar high-impact polypropylenes using industrially-preferred heterogeneous catalysts is challenging due to the poisoning functional groups towards metal center and high stereo-selectivity requirement. In this work, dual-site combining Ziegler-Natta Brookhart-Ni were used produce polyolefin ionomers, followed by containing isotactic polypropylene branched polyethylene as toughening agents. Three combination modes between these investigated, including mixed, core-shell, integrated types. catalyst achieved optimal material properties because ionomer acted a suture molecule that stitched different components into whole network. This produced sutured with excellent mechanical compatibility substances. restraining effect molecules greatly reduced release microplastic particles after aging. Moreover, obtained can serve an efficient compatibilizer recycle polyethylene/polypropylene mixed-waste plastics. work provides appealing potentially practical strategy upgrade widely alleviate ever-growing plastic pollution issue.
Language: Английский
Citations
1
Applied Organometallic Chemistry, Journal Year: 2024, Volume and Issue: 38(7)
Published: May 14, 2024
In this contribution, a series of unsymmetric α‐diimine nickel complexes are synthesized. One side these is the 2,4‐dimethyl‐6‐diphenylmethylaniline unit, and steric effects tuned by changing another aniline unit. These have high catalytic activities in ethylene (>10 6 g mol −1 h ) 1‐octene (10 4 –10 5 polymerization, generating high‐molecular‐weight polyolefins ( M n > 10 with tunable branching densities (59–91/1000C). Steric polymerization temperature can significantly affect performance catalyst. Most importantly, catalysts different hindrances sensitivity. general, larger more sensitive to temperature. This may be due fact that rotation some chemical bonds blocked at low temperatures volume substituents, resulting significant
Language: Английский
Citations
1
Journal of Applied Polymer Science, Journal Year: 2024, Volume and Issue: 141(28)
Published: May 6, 2024
Abstract Heterogenization of nickel‐based olefin polymerization catalysts has received increasing attention in recent years. In this contribution, positional heterogenization effect salicylaldimine nickel catalyzed ethylene is studied. The pre‐catalysts bearing anchor groups are synthesized, characterized, and investigated heterogeneous catalytic polymerization. anchoring installed at different positions, including the 4‐position salicylaldehyde moiety aniline moiety. It shown that positions have significant effects on by SiO 2 ‐supported catalysts. This provides a strategy worth considering for design high‐performance future.
Language: Английский
Citations
0
Angewandte Chemie, Journal Year: 2024, Volume and Issue: unknown
Published: Nov. 2, 2024
Abstract The direct synthesis of polar high‐impact polypropylenes using industrially‐preferred heterogeneous catalysts is challenging due to the poisoning functional groups towards metal center and high stereo‐selectivity requirement. In this work, dual‐site combining Ziegler–Natta Brookhart‐Ni were used produce polyolefin ionomers, followed by containing isotactic polypropylene branched polyethylene as toughening agents. Three combination modes between these investigated, including mixed, core–shell, integrated types. catalyst achieved optimal material properties because ionomer acted a suture molecule that stitched different components into whole network. This produced sutured with excellent mechanical compatibility substances. restraining effect molecules greatly reduced release microplastic particles after aging. Moreover, obtained can serve an efficient compatibilizer recycle polyethylene/polypropylene mixed‐waste plastics. work provides appealing potentially practical strategy upgrade widely alleviate ever‐growing plastic pollution issue.
Language: Английский
Citations
0
Chemical Research in Chinese Universities, Journal Year: 2023, Volume and Issue: 39(5), P. 726 - 730
Published: July 3, 2023
Language: Английский
Citations
1