An interesting alternative to the industrial two‐stage cascade process for the production of bimodal polyethylene, used for high resistance applications such as pressure pipes, has been developed. The key point is a binary catalytic system with chromium and metallocene sites incorporated together on AlSBA‐15 mesostructured material. This hybrid catalyst is able to produce bimodal polyethylene in a single reactor. In the present work, it is shown that, in the presence of hydrogen and comonomer (1‐butene or 1‐hexene) in the reaction medium, the obtained polyethylenes exhibit appropriate mechanical properties for pipes manufacture, such as resistance to rapid crack propagation (RCP) and slow crack growth (SCG), reaching standards for PE100 and even for PE100RC grades.

中文翻译：

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氧化铬/茂金属杂化催化剂对高阻态应用双峰聚乙烯的评价

已经开发出一种有趣的替代方法，用于生产双峰聚乙烯的工业两步级联工艺，该工艺用于压力管道等高电阻应用。关键是在AlSBA-15介孔结构材料上结合了铬和茂金属位点的二元催化体系。这种杂化催化剂能够在单个反应器中生产双峰聚乙烯。在目前的工作中，研究表明，在反应介质中存在氢和共聚单体（1-丁烯或1-己烯）的情况下，获得的聚乙烯显示出适合管材制造的机械性能，例如耐快速裂纹扩展（ RCP）和缓慢的裂纹扩展（SCG），达到PE100甚至PE100RC等级的标准。