Novel Ti@COF catalysts for the preparation of ultra-high molecular weight linear polyethylene†

IF 2.6 3区化学 Q2 CHEMISTRY, MULTIDISCIPLINARY

CrystEngComm Pub Date : 2025-01-29 DOI:10.1039/D5CE00042D

Hao-Tian Li, Jie Gu, Nian-Zu Shu, Guo-Long He, He-Gen Zheng and Chuan-Lei Zhang

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Abstract

The development of the polyolefin industry hinges on the development of high-performance catalysts. Covalent organic frameworks (COFs), as novel porous materials, hold great potential in heterogeneous catalysis. In this study, Ti@COF catalysts, namely Ti@TbDa and Ti@TtDa, were designed and synthesized under solvothermal conditions and post-modification. Ethylene polymerization experiments demonstrated that Ti@TtDa exhibited an extremely high polymerization activity of 4.31 × 10⁴ g_PE mol_Ti⁻¹ h⁻¹ at a pressure of 0.5 MPa, and the products have opened up new avenues for the production of ultra-high molecular weight linear polyethylene (M_w = 1.57 × 10⁶ g mol⁻¹) and a low molecular weight distribution (D = 4.80). Such catalysts brought new ideas for the design of olefin polymerization catalysts and contributed to the upgrading of the polyethylene industry.

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制备超高分子量线性聚乙烯†的新型Ti@COF催化剂

聚烯烃工业的发展取决于高性能催化剂的发展。共价有机骨架（COFs）作为一种新型多孔材料，在多相催化方面具有很大的应用潜力。本研究在溶剂热条件下设计合成了Ti@COF催化剂，即Ti@TbDa和Ti@TtDa。乙烯聚合实验表明，Ti@TtDa在0.5 MPa压力下的聚合活性为4.31 × 104 gPE molTi−1 h−1，为生产超高分子量线性聚乙烯（Mw = 1.57 × 106 g mol−1）和低分子量分布聚乙烯（D = 4.80）开辟了新的途径。这些催化剂为烯烃聚合催化剂的设计带来了新的思路，为聚乙烯工业的升级换代做出了贡献。

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