催化作用
齐格勒-纳塔催化剂
聚合
聚乙烯
粒子(生态学)
高分子化学
扫描电子显微镜
粒径
猝灭(荧光)
形态学(生物学)
化学工程
化学
加合物
乙烯
材料科学
核化学
有机化学
物理化学
聚合物
复合材料
荧光
生物
量子力学
工程类
地质学
遗传学
物理
海洋学
作者
Roghayeh Jamjah,Gholamhossein Zohuri,Javid Vaezi,Saeid Ahmadjo,M Nekomanesh,M. Pouryari
摘要
Abstract Spherical MgCl 2 ·nEtOH was prepared by adducting ethanol to MgCl 2 using melt quenching method. Effect of molar ratio of [EtOH]/[MgCl 2 ] = 2.8–3.05 on the morphology and particle size of the MgCl 2 ·nEtOH were studied. The best adduct of spherical morphology was obtained when 2.9 mol ethanol to 1 mol MgCl 2 was used. An emulsion of dissolved MgCl 2 in ethanol was prepared in a reactor containing silicon oil. Stirrer speed of the emulsion and its transfer rate to quenching section that work at −10 to −40°C are affected by the particle size of the adduct particle. The adducted ethanol was partially removed with controlled heat primary to catalyst preparation (support). Treatment of the support with excess TiCl 4 increased its surface area from 13.1 to 184.4 m 2 /g. Heterogeneous Ziegler‐Natta catalyst system of MgCl 2 (spherical)/TiCl 4 was prepared using the spherical support. Scanning electron microscopy studies of adduct, support, and catalyst obtained shown spherical particles, however, the polyethylene particles obtained have no regular morphology. The behavior indicates harsh conditions used for catalyst preparation, prepolymerization, and polymerization method used. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 101: 3829–3834, 2006
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