Ethyl silicate oligomers were impregnated into a generic Phillips Cr/silica catalyst used commercially for ethylene polymerization. After calcination, this treatment results in a secondary deposition of silica into the original silica matrix, which changes the porosity of the catalyst somewhat and strengthens its overall structure. The process can be used as a powerful tool to manipulate polymer properties because the molecular weight of the polymer, the MW distribution, and the amount of long-chain branching (LCB) it contains, were found to be strongly influenced, and with them all aspects of molding behavior. This result provides still more evidence that the physical structure of the Cr/silica catalyst can have major consequences for the polymerization reaction, which shapes the character of the polymer. This method of controlling polymer properties is perhaps more convenient for commercial operations than those described previously.

将硅酸乙酯低聚物浸渍到商业上用于乙烯聚合的通用Phillips Cr /二氧化硅催化剂中。煅烧后，该处理导​​致二氧化硅二次沉积到原始二氧化硅基质中，这在某种程度上改变了催化剂的孔隙率并增强了催化剂的整体结构。该方法可以用作控制聚合物性能的有力工具，因为发现该聚合物的分子量，分子量分布以及它所含的长链支化（LCB）的量受到强烈影响，并且所有这些因素均会受到影响。成型行为的各个方面。该结果提供了更多的证据，表明Cr /二氧化硅催化剂的物理结构可能对聚合反应产生重大影响，从而影响了聚合物的性能。