Ethylene Polymerization Catalyzed by Poly(amidoamine)-Supported Titanium Dendritic Catalysts

Zhao, Chunbin; Yuan, Qiaolong; Zhang, Danfeng; Huang, Baotong

doi:10.3724/sp.j.1105.2007.00810

Cited by 2 publications

(6 citation statements)

References 28 publications

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“…Moreover, the chain transfer was effectively inhibited, thus increasing the catalytic activity and viscosity average molecular weight; however, the viscosity of the system will increase with the increase of the content of higher olefin, and when the viscosity reaches a certain value, the chain growth reaction will be hindered, thus resulting in the declined content of the higher olefin. The titanium catalysts C, C 1 , 26 and C 2 35 were used as the research objects (Figures 6 and 10) to investigate the effect of the catalyst structure on the performance of ethylene polymerization. Under the optimal reaction conditions, three kinds of salicylaldimine titanium were obtained.…”

Section: Resultsmentioning

confidence: 99%

“…However, most of them are studies on ethylene oligomerization; − studies on homogeneous polymerization of ethylene catalyzed are limited. Zhao conducted preliminary studies on the titanium-catalyzed ethylene polymerization of polyamides dendrimers, but they did not evaluate the effects of core ligand structure changes on the activity and product properties. In recent years, the author’s research group synthesized a series of transition-metal catalysts with dendrimers as the skeleton to catalyze ethylene polymerization.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis of New Dendritic Titanium Catalysts and Catalytic Ethylene Polymerization

et al. 2021

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The 1.0G dendrimer polyamidoamine (PAMAM), 3,5-dichlorosalicylaldehyde, and TiCl4·2THF were used as synthetic materials, and the dendritic salicylaldehyde imide ligand with substituent hindrance and its titanium catalyst were synthesized by the condensation reaction of Schiff base. The structure of the synthesized products was characterized by infrared spectroscopy, nuclear magnetic resonance hydrogen spectroscopy, ultraviolet spectroscopy, electrospray mass spectrometry, and inductively coupled plasma-mass spectrometry. Activated methylaluminoxane (MAO) was used as a catalyst precursor for ethylene polymerization in the process of ethylene catalytic. The effects of ethylene polymerization were studied in terms of the Al/Ti molar ratio, reaction time, reaction temperature, polymerization pressure, and ligand structure of the catalyst. The results show good catalytic performance (70.48 kg PE/mol Ti·h) for ethylene polymerization because of the existence of ortho substituent hindrance on the salicylaldehyde skeleton. Furthermore, high-temperature gel permeation chromatography (GPC)-IR, differential scanning calorimetry (DSC), and torque rheometer were used to characterize the microstructure, thermal properties, and viscoelastic state of the polyethylene samples obtained. The results showed that the product was ultrahigh-molecular-weight polyethylene.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Synthesis of New Dendritic Titanium Catalysts and Catalytic Ethylene Polymerization

et al. 2021

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“…The molecular weight of polyethylene was determined using the viscosity method and gel chromatography (GPC). The former-used decalin as a solvent at 135 ± 0.1°C by using Uzbekistan viscometer, where η = 6.77 × 10 −2 (M η ) 0.67 [ 28 ]. The viscosity-average molecular weight Mη of polyethylene was calculated.…”

Section: Methodsmentioning

confidence: 99%

“…Reaction conditions: 8 lmol catalyst, Al/Ni 1000, toluene 50 mL, 30 min, 25°C,1.0 MPa ethylene. The titanium catalysts C, C 1 [28], and C 2 [37]were used as the research objects (Figure 1 and 6) to investigate the effect of the catalyst structure on the performance of ethylene polymerization. Under the optimal reaction conditions, three kinds of salicylaldimine titanium were obtained.…”

Section: Effect Of Catalyst Structure On the Catalyst Activity And Relative Molecular Massmentioning

confidence: 99%

“…UHMWPE can be synthesized by changing the ligand structures. Among the FI catalysts, dendritic macromolecular catalysts [25][26][27][28] are relatively special, which can accurately control the number and positions of catalytic active points, so their catalytic performance has been widely studied. In recent years, we have synthesized a series of transition metal catalysts with dendrimers as the framework and used them to catalyze the polymerization of ethylene.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis and ethylene polymerization reaction of dendritic titanium catalysts

Lan

Chen

Zhang

et al. 2021

Designed Monomers and Polymers

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The 1.0 G dendrimer (C 22 H 48 N 10 O 4 ),3,5-di-tert-butylsalicylaldehyde and TiCl 4 · 2THF were used as the synthetic materials, and the dendritic salicylaldehyde imide ligand with substituent hindrance and its titanium catalyst were synthesized by the condensation reaction of schiff base. The structure of the synthesized products was characterized by infrared spectroscopy, nuclear magnetic resonance hydrogen spectroscopy, ultraviolet spectroscopy, electrospray mass spectrometry, and inductively coupled plasma mass spectrometry, The actual structure is consistent with the theoretical design structure. Activated methylaluminoxane (MAO) was used as a catalyst precursor for ethylene polymerization in the process of ethylene catalytic. The effects of ethylene polymerization were studied in terms of the Al/Ti molar ratio, reaction time, reaction temperature, polymerization pressure, and ligand structure of the catalyst. The results show at the reaction temperature of 25°C, the reaction time was 30 min, and the ethylene pressure was 1.0 MPa and Al/Ti was 1,000, the catalytic activity can reach 78.56 kg PE/(mol Ti.h). Furthermore, high-temperature GPC-IR, DSC, and torque rheometer were used to characterized the microstructure, thermal properties, and viscoelastic state of polyethylene samples obtained. The results showed that the product was ultra-high-molecular-weight polyethylene.

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Ethylene Polymerization Catalyzed by Poly(amidoamine)-Supported Titanium Dendritic Catalysts

Cited by 2 publications

References 28 publications

Synthesis of New Dendritic Titanium Catalysts and Catalytic Ethylene Polymerization

Synthesis of New Dendritic Titanium Catalysts and Catalytic Ethylene Polymerization

Synthesis and ethylene polymerization reaction of dendritic titanium catalysts

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