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首页> 外文期刊>ACS Omega >Structure and Properties of Poly-α-olefins Containing Quaternary Carbon Centers
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Structure and Properties of Poly-α-olefins Containing Quaternary Carbon Centers

机译：含有季碳中心的聚α-烯烃的结构与性能

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In this paper, poly-α-olefins (PAO) containing quaternary carbon centers were prepared by two-step oligomerization using a metallocene catalyst followed by a Ziegler–Natta catalyst. First, the 1-decene dimer was oligomerized with [t -BuN(Me)_(2)C(η~(5)-C_(5)H_(4))]ZrCl_(2), and the effects of the oligomerization temperature, Al/Zr molar ratio, and catalyst loading on the oligomerization were investigated. In the second step, the obtained 1-decene dimers were copolymerized with 1-decene with TiCl_(4)/Et_(2)AlCl, and the effects of the catalysts, monomer/dimer ratio, and α-olefin species on the copolymerization were investigated. The composition and structure of the dimers and copolymerization products were characterized by gas chromatography (GC) and ~(1)H NMR and ~(13)C NMR spectroscopy. The results of GC and ~(13)C NMR analyses indicated that the metallocene catalyzed the formation of the 1-decene oligomerization product, resulting in the branched olefin dimer being the major product, and the existence of quaternary carbons in the 1-decene/1-decene dimer copolymerization product could also be found. The polymerization mechanism for the formation of the quaternary carbon centers is proposed. The 1-decene/1-decene dimer copolymerization product containing quaternary carbon centers has a kinematic viscosity of 10.8 mm~(2)/s at 100 °C, a viscosity index of 165, and a pour point of ?52 °C; thus, the product with quaternary carbon centers has a better viscosity–temperature performance and low-temperature fluidity than those of the 1-decene oligomerization product and typical PAO products, but the kinematic viscosity is similar.
机译：在本文中，通过使用茂金属催化剂的两步低聚，然后用Ziegler-Natta催化剂进行两步寡聚化制备含有季碳中心的聚-α-烯烃（Pao）。首先，用[ T-BUN（ME）_（2）C（η〜（5）-C_（5）H_（4））] ZRCL_（2）和效果，将1-癸烯二聚体少化研究了寡聚化温度，Al / Zr摩尔比和寡聚化上的催化剂负载。在第二步骤中，将得到的1-癸烯二聚体与用1-癸烯与TiCl_（4）/ Et_（2）AlCl共聚，催化剂，单体/二聚体比和α-烯烃物种对共聚的影响是调查。通过气相色谱（GC）和〜（1）H NMR和〜（13）C NMR光谱表征二聚体和共聚产物的组成和结构。 GC和〜（13）C NMR分析结果表明，茂金属催化了1-癸烯低聚产物的形成，导致支化烯烃二聚体是主要产物，以及1-癸烯中的第四纪碳的存在还可以找到1-癸烯二聚体共聚产物。提出了形成季碳中心的聚合机制。含有季碳中心的1-癸烯/ 1-癸烯二聚体共聚产物在100℃下具有10.8mm〜（2）/ s的运动粘度，粘度指数为165，倾点为52°C;因此，具有季碳中心的产品具有更好的粘度温度性能和低温流动性，而不是1-癸烯寡聚化产品和典型的PAO产品，但运动粘度相似。

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