文献类型：期刊文献

英文题名：Preparation and Characterization of Single-Component Poly-α-olefin Oil Base Stocks

作者：Dong, Su Q.[1];Mi, Pu K.[1];Xu, Sheng[2];Zhang, Jun[2];Zhao, Rui D.[1]

机构：[1]East China Univ Sci & Technol, Sch Mat Sci & Engn, Minist Educ, Shanghai Key Lab Adv Polymer Mat,Key Lab Ultrafin, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Sch Chem & Mol Engn, Shanghai 200237, Peoples R China

年份：2019

卷号：33

期号：10

起止页码：9796

外文期刊名：ENERGY & FUELS

收录：;EI(收录号：20194207540766);WOS:【SCI-EXPANDED(收录号:WOS:000492113000035)】；

基金：We are grateful to and all funds are sourced from the National Key R&D Program of China (2017YFB0306701) and the Project of Shanghai Key Discipline and Key Laboratory, China (Nos. B502, 08DZ2230500).

语种：英文

外文关键词：Molecular structure - Olefins - Catalysts - Dimers - Molecular weight distribution - Dimerization - Organometallics

摘要：In this paper, a single-component poly-alpha-olefin (PAO) oil base stock of an alpha-olefin tetramer was prepared via two-step oligomerization using a metallocene catalyst and a Ziegler-Natta catalyst in sequence. The structure was characterized, the performance was investigated, and the effects of the molecular structure and composition on performance were evaluated. First, the alpha-olefins were dimerized with different metallocenes as the catalyst, and the effects of the oligomerization conditions (amount of catalyst, temperature, and ratio of Al/Zr) on the molecular weight distribution of the obtained polymers were investigated. The dimerization selectivity reached 83.1%, and the content of branched alpha-olefin was 91.7%. In the second step, the obtained alpha-olefin dimer was polymerized by a Ziegler-Natta catalyst, and the dimerization reaction was dominant. A PAO with a tetramer content of 89.6% was obtained, and at 100 degrees C, the kinematic viscosity was 6.4 cSt and the viscosity index was 148. Further results suggested that both molecular structure parameters (the length of the main chain and the length of the branches) affect the PAO properties when the number of branches and the branch position on the molecular skeleton are the same. It was also found that, as the length of the main chain and the length of the branches increased, the kinematic viscosity and viscosity index increased, while the pour point decreased; however, when the length of the main chain, the number of branches, and the length of the branches were the same, the presence of quaternary carbons in the main chain lowered the viscosity index and increased the pour point.