Polymerization of Ethylene with Calix[8]arene Neodymium-Al(i-Bu)3System

Abstract

Abstract: Calix[8]arene neodymium was prepared by reacting calix[8]arene with metallic sodium in a mixture of benzene and isopropanol, then with anhydrous neodymium chloride. Calix[8]arene neodymium in combination with Al(i-Bu)₃as a cocatalyst was active in the polymerization of ethylene. Effects of Al/Nd molar ratio, concentration of catalyst and temperature on the ethylene polymerization were studied in detail. Polyethylene having Mv of 97×10⁴was obtained under the following conditions: [Nd]=8×10^-4mol/L, the molar ratio of Al to Nd=15, 80 ℃, 0.5 h; ethylene pressure=1.2 MPa, and the catalytic activity is 24 kg PE/(mol Nd·h) .

Key words: Calix[8]arene, Rare earth catalyst, Polymerization of ethylene

CLC Number:

O632.12

TrendMD:

SHEN Zhi-Quan, CHEN Yao-Feng, ZHANG Yi-Feng, KOU Rui-Qiang, CHEN Lin-Shen  . Polymerization of Ethylene with Calix[8]arene Neodymium-Al(i-Bu)₃System[J]. Chem. J. Chinese Universities, 1999, 20(12): 1982.

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Polymerization of Ethylene with Calix[8]arene Neodymium-Al(i-Bu)₃System

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