Kang Wenqian, Wang Xiong, Ren Yue, Zhang Pingsheng, Huang Anping, Li Guangquan
Lanzhou Petrochemical Research Center, Petrochemical Research Institute, PetroChina Lanzhou 730060 China
RSC Adv. 2024 Oct 29;14(47):34578-34585. doi: 10.1039/d4ra06166g.
Porous organic polymers (POPs) are attracting attention for their easy functionalization and potential as catalyst supports in olefin polymerization. In this study, sulfonated POP (s-POP) supported Ziegler-Natta catalysts were used for ethylene polymerization, producing ultra-high molecular weight polyethylene, with reaching up to 6.83 × 10 g mol. The maximum of polyethylene was achieved by Cat-3 with DIBP as the internal donor, albeit with a partial loss of catalytic activity. Polymerization conditions also play a pivotal role in determining the molecular weight of polyethylene. Hydrogen, being the most efficient chain transfer agent, can decrease the molecular weight to 9.68 × 10 g mol at higher hydrogen concentrations ([H] : [CH] = 0.83), and the s-POP-supported ethylene polymerization catalysts were observed to exhibit high sensitivity to hydrogen response. The effects of polymerization temperature, [Al] : [Ti] molar ratio, and ethylene pressure on ethylene polymerization were thoroughly investigated.
多孔有机聚合物（POPs）因其易于功能化以及在烯烃聚合中作为催化剂载体的潜力而备受关注。在本研究中，磺化POP（s-POP）负载的齐格勒-纳塔催化剂用于乙烯聚合，生产出超高分子量聚乙烯，其分子量高达6.83×10⁶ g/mol。以邻苯二甲酸二异丁酯（DIBP）作为内给电子体的Cat-3催化剂实现了聚乙烯的最大分子量，不过催化活性有部分损失。聚合条件在决定聚乙烯分子量方面也起着关键作用。氢气作为最有效的链转移剂，在较高氢气浓度（[H]∶[CH] = 0.83）下可将分子量降低至9.68×10⁵ g/mol，并且观察到s-POP负载的乙烯聚合催化剂对氢气响应表现出高敏感性。全面研究了聚合温度、[Al]∶[Ti]摩尔比以及乙烯压力对乙烯聚合的影响。
