Abstract: The molecular weight distribution of the polyolefins was analyzed before and after the oligomers removed from the crude product by centrifugation. These polymers were produced by CX process consisting of slurry homo-polymerization, slurry copolymerization and centrifugation，or by gas process including slurry homo-polymerization and gas copolymerization. The effect of the oligomers on the dynamic and thermal properties of the product was studied. The results showed that the oligomers within the product was partially removed by centrifugation. The dynamic and thermal properties of the product were improved, comparison with the crude product. The content of comonomer incorporation within the polyolefin chain was determined by 13C NMR, the result revealed that the oligomers had higher content of comonomer incorporation than the polymer with high molecular weight. A new polymerization process, consisting of slurry homo-polymerization, centrifugation to remove oligomer partially and gas copolymerization, might be proposed.

摘要： 通过对CX（淤浆均聚 + 淤浆共聚 + 离心脱除低聚物）工艺产品中离心机脱除低聚物前后聚合物的分子量分布的分析对比，得出离心机可以脱除低聚物，最终产品中低聚物含量降低；通过力学和热稳定性的研究，证明了产品经离心机脱除低聚物后力学及热性能均有所提高；利用核磁分析了烯烃淤浆聚合工艺难以生产高共聚单体含量的聚乙烯牌号的原因。