Copolymerization of ethylene/diene with different metallocene catalysts

被引：0

作者：

Vieira Marques, Maria de Fatima ^{[1
]}

Rocha, Fernanda Constantino ^{[1
]}

Soto, Narda Juarez ^{[1
]}

机构：

[1] Univ Fed Rio de Janeiro, IMA, Inst Macromol Prof Eloisa Mano, BR-21941590 Rio De Janeiro, Brazil

来源：

ZEITSCHRIFT FUR NATURFORSCHUNG SECTION B-A JOURNAL OF CHEMICAL SCIENCES | 2006年 / 61卷 / 11期

关键词：

ethylene copolymer; non-conjugated dienes; metallocene catalysts; polyolefins; copolymerization;

D O I：

暂无

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

Copolymerizations of ethylene and 1,7-octadiene were carried out employing homogeneous catalysts Cp2ZrCl2, Ph2C(Flu,Cp)ZrCl2 and Et(Ind)(2)ZrCl2, and methylaluminoxane as cocatalyst. The polymerization characteristics, such as catalytic activity, polymerization rate, copolymer composition, and thermal properties were examined in relation to the catalyst type. Different comonomer concentrations were employed, and the reaction time was varied, ranging from 1 h up to 4 h, at 90 degrees C and at 0.5 bar ethylene pressure. The results showed that the catalyst Cp2ZrCl2 was more efficient than Et(Ind)(2)ZrCl2 in the preparation of high diene content ethylene/1,7-octadiene copolymers. On the other hand, Et(Ind)(2)ZrCl2 and Ph2C(Flu,Cp)(2)ZrCl2 catalysts produced low insaturation content but possibly formed cyclic structures and crosslinking.

引用

页码：1426 / 1432

页数：7

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