Concerted Steric and Electronic Strategy in Thermostable Salicylaldiminato Nickel Catalysts for Ethylene (Co)polymerization

IF 4.1 2区 化学 Q2 POLYMER SCIENCE Chinese Journal of Polymer Science Pub Date : 2024-06-05 DOI:10.1007/s10118-024-3148-y
Hong-Yu Ji, Hong-Liang Mu, Chun-Feng Tang, Yu-Xing Zhang, Yue Chi, Zhong-Bao Jian
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Abstract

Olefin polymerization is one of the most important chemical reactions in industry. This work presents a strategy that emphasizes the synergistic meta/para-steric hindrance of N-aryl groups and electronic effects in newly synthesized neutral salicylaldiminato nickel catalysts. These nickel(II) catalysts exhibit exceptional thermostability, ranging from 30 °C to 130 °C, demonstrating enhanced catalytic activities and broadly regulated polyethylene molecular weights (3–341 kg·mol−1) and controlled polymer branch density (2–102 brs/1000C). The preferred catalyst Ni3 with concerted steric and electronic effects enables the production of solid-state semi-crystalline polyethylene materials at temperatures below 90 °C. Notably, Ni3 exhibits an impressive tolerance of 110 °C and can withstand even the challenging polymerization temperature of 130 °C, leading to the production of polyethylene wax and oil. Also, functionalized polyethylene is produced.

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用于乙烯(共)聚合的恒温水杨醛亚氨基镍催化剂中的协同立体和电子策略
烯烃聚合是工业中最重要的化学反应之一。本研究提出了一种策略,强调在新合成的中性水杨醛亚氨基镍催化剂中,N-芳基的元/副星状阻碍和电子效应的协同作用。这些镍(II)催化剂具有出色的热稳定性,温度范围从 30 °C 到 130 °C,催化活性得到增强,聚乙烯分子量(3-341 kg-mol-1)得到广泛调节,聚合物支链密度(2-102 brs/1000C)得到控制。首选催化剂 Ni3 具有协同立体效应和电子效应,可在低于 90 °C 的温度下生产固态半结晶聚乙烯材料。值得注意的是,Ni3 的耐受温度高达 110 ℃,甚至可以承受 130 ℃ 的聚合温度,从而生产出聚乙烯蜡和油。此外,还能生产功能化聚乙烯。
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来源期刊
Chinese Journal of Polymer Science
Chinese Journal of Polymer Science 化学-高分子科学
CiteScore
7.10
自引率
11.60%
发文量
218
审稿时长
6.0 months
期刊介绍: Chinese Journal of Polymer Science (CJPS) is a monthly journal published in English and sponsored by the Chinese Chemical Society and the Institute of Chemistry, Chinese Academy of Sciences. CJPS is edited by a distinguished Editorial Board headed by Professor Qi-Feng Zhou and supported by an International Advisory Board in which many famous active polymer scientists all over the world are included. The journal was first published in 1983 under the title Polymer Communications and has the current name since 1985. CJPS is a peer-reviewed journal dedicated to the timely publication of original research ideas and results in the field of polymer science. The issues may carry regular papers, rapid communications and notes as well as feature articles. As a leading polymer journal in China published in English, CJPS reflects the new achievements obtained in various laboratories of China, CJPS also includes papers submitted by scientists of different countries and regions outside of China, reflecting the international nature of the journal.
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