Ethylene and 1-butene copolymerization catalyzed by a Ziegler–Natta/Metallocene hybrid catalyst through a 2³ factorial experimental design

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• 作者：de Camargo Forte ; Maria Madalena ; da Cunha ; Fernanda Oliveira Vieira ; dos Santos ; Joã ; o Henrique Zimnoch ; et. al.
• 关键词：2³ Factorial design ; Ziegler&ndash ; Natta ; Metallocene
• 刊名：Polymer
• 出版年：2003
• 出版时间：March, 2003
• 年：2003
• 卷：44
• 期：5
• 页码：1377-1384
• 全文大小：1.28 M

文摘

In this work, a 2³ factorial experimental design for the evaluation of ethylene–1-butene copolymerization was employed. The following reaction parameters were used as independent variables: catalyst type, Al/Ti molar ratio and 1-butene concentration. The copolymerization was carried out using hybrid Ziegler–Natta/Metallocene catalysts with different titanium molar ratios. The catalyst activity and polymer characteristics were statistically analyzed through response surface methods. It was found that the catalyst type has a significant effect on activity, melt flow index and 1-butene content. Copolymers presented crystallinity values ranging from 46 to 58 % and melt temperature in the 128–131°C range. Copolymer comonomer content varied from 2 to 6 % in weight.