✦ LIBER ✦

Effect of polymerization temperature on the microtacticity of isotactic poly(propylene) prepared using heterogeneous (MgCl2-supported) Ziegler-Natta catalysts

✍ Scribed by John C. Chadwick; Giampiero Morini; Giulio Balbontin; Olof Sudmeijer

Publisher: John Wiley and Sons
Year: 1998
Tongue: English
Weight: 533 KB
Volume: 199
Category: Article
ISSN: 1022-1352
DOI: 10.1002/(sici)1521-3935(19980901)199:9<1873::aid-macp1873>3.0.co;2-c

No coin nor oath required. For personal study only.

✦ Synopsis

A study of the effect of polymerization temperature on the microtacticity of poly(propy1ene) prepared using various MgClz-supported catalysts has shown that, in almost all cases, an increase in temperature leads not only to higher proportions of isotactic polymer but also to increased stereoregu1arit:y of the isotactic fraction. The results indicate a greater relative increase in productivity, with increasing temj'erature, for highly isospecific as opposed to moderately isospecific centres. It is suggested that easier propagation after the occasional regioirregular (2,l-) insertion may contribute to this effect.

📜 SIMILAR VOLUMES

Effect of diether as internal donor on M

Effect of diether as internal donor on MgCl2-supported Ziegler–Natta catalyst for propylene polymerization

✍ Nannan Cui; Yucai Ke; Huayi Li; Zhicheng Zhang; Cunyue Guo; Zhanxia Lv; Youliang 📂 Article 📅 2005 🏛 John Wiley and Sons 🌐 English ⚖ 92 KB 👁 2 views

## Abstract This article demonstrates the influence of the molar ratio between diether as internal donor and Magnesium dichloride in processing of the catalyst preparation on the catalytic performance for propylene polymerization with MgCl~2~‐supported Ziegler–Natta catalyst. The effect of electron

Effect of high polymerization temperatur

Effect of high polymerization temperature on the microstructure of isotactic polypropylene prepared using heterogeneous ticl4/mgcl2 catalysts

✍ Chifeng Zhong; Mingzhi Gao; Bingquan Mao 📂 Article 📅 2003 🏛 John Wiley and Sons 🌐 English ⚖ 103 KB 👁 2 views

Study of hydrogen effect in propylene po

Study of hydrogen effect in propylene polymerization on (with) the MgCl2-supported ziegler-natta catalyst—part 2. Effect of CS2 on polymerization centres

✍ E.I. Vizen; L.A. Rishina; L.N. Sosnovskaja; F.S. Dyachkovsky; I.L. Dubnikova; T. 📂 Article 📅 1994 🏛 Elsevier Science 🌐 English ⚖ 278 KB

Study of the effect of hydrogen in propy

Study of the effect of hydrogen in propylene polymerization with the MgCl2-supported ziegler-natta catalyst—part 1. Kinetics of polymerization

✍ L.A. Rishina; E.I. Vizen; L.N. Sosnovskaja; F.S. Dyachkovsky 📂 Article 📅 1994 🏛 Elsevier Science 🌐 English ⚖ 285 KB

Propylene polymerization was investigated with the TiC14/MgCI 4 supported catalyst with the stereoregulating donor pair dibutylphtalate (DBPH)/triethoxyphenylsilane (TEPS) in heptane with A1Et 3 as cocatalyst in the presence of hydrogen. It was shown that there is an activation effect by the influen

Study of propylene polymerization cataly

Study of propylene polymerization catalyzed by a spherical MgCl2-supported Ziegler–Natta catalyst system: The effects of external donors

✍ Zhenli Ma; Li Wang; Wenqin Wang; Lianfang Feng; Xueping Gu 📂 Article 📅 2004 🏛 John Wiley and Sons 🌐 English ⚖ 136 KB 👁 1 views

Synthesis of a TiCl4 Ziegler-Natta Catal

Synthesis of a TiCl4 Ziegler-Natta Catalyst Supported on Spherical MgCl2 · nEtOH for the Polymerization of Ethylene and Propylene

✍ Lidiane A. Almeida; Maria de Fátima V. Marques 📂 Article 📅 2011 🏛 John Wiley and Sons 🌐 English ⚖ 661 KB

## Abstract Experiments designed to prepare Ziegler‐Natta catalysts with controlled particle morphology are reported. Different dealcoholation processes are used on the adduct MgCl~2~ · __n__EtOH to prepare the catalysts: either thermal treatment or chemical dealcoholation employing different subst