The preparation of nanosized polyethylene particles via novel heterogeneous non-metallocene catalyst (m-CH3PhO)TiCl3/CNTs/AlEt3

Wang, J; Guo, Jiangping; Yi, Jianjun; Huang, Qigu; Li, H M; Li, Y F; Gao, Kejing; Yang, Wantai

doi:10.1088/1757-899x/62/1/012024

Cited by 1 publication

(1 citation statement)

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“…The catalyst used in the polymerization process is a key factor for obtaining high molecular weight. In the present, the catalysts used to synthesize UHMWPE include Ziegler-Natta catalysts [2][3][4][5], metallocene catalysts [6][7][8][9][10], non-metallocene catalysts [11][12][13][14], and composite catalysts [15][16][17]. Composite catalysts have attracted much attention because of the simple synthesis process and high catalytic efficiency.…”

Section: Introductionmentioning

confidence: 99%

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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