Effect of the cocatalyst on the copolymerization of ethylene and propylene with high activity Ziegler-Natta catalyst

J. Koivumäki; J. V. Seppälä; Lauri Kuutti

doi:10.1007/BF00558055

Effect of the cocatalyst on the copolymerization of ethylene and propylene with high activity Ziegler-Natta catalyst

J. Koivumäki, J. V. Seppälä, Lauri Kuutti

Helsinki University of Technology

Research output: Contribution to journal › Article › Scientific › peer-review

13 Citations (Scopus)

Abstract

Ethylene and propylene were copolymerized in n-heptane in the presence of high activity heterogeneous Ziegler-Natta catalyst to study the effect of the cocatalyst on the microstructure and molecular weight of the copolymer. Seven aluminium alkyls of structure Al((CH₂)_nCH₃)₃, where n = 0—3, 5, 7 or 11, and one of structure Al(C(CH₃)₃)₃, were used as cocatalysts. The effect of the Al/Ti mole ratio was also studied. Modern molecular modelling techniques were used to calculate the volume of the cocatalyst and the electron density around aluminium. The size of the cocatalyst molecule was found to have a marked effect on the activity of the catalyst: the smaller the cocatalyst the higher the activity. Higher electron density around aluminium increased the randomness of the copolymer.

Original language	English
Pages (from-to)	185-191
Number of pages	6
Journal	Polymer Bulletin
Volume	29
Issue number	1-2
DOIs	https://doi.org/10.1007/BF00558055
Publication status	Published - 1992
MoE publication type	A1 Journal article-refereed

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10.1007/BF00558055

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title = "Effect of the cocatalyst on the copolymerization of ethylene and propylene with high activity Ziegler-Natta catalyst",

abstract = "Ethylene and propylene were copolymerized in n-heptane in the presence of high activity heterogeneous Ziegler-Natta catalyst to study the effect of the cocatalyst on the microstructure and molecular weight of the copolymer. Seven aluminium alkyls of structure Al((CH2)nCH3)3, where n = 0—3, 5, 7 or 11, and one of structure Al(C(CH3)3)3, were used as cocatalysts. The effect of the Al/Ti mole ratio was also studied. Modern molecular modelling techniques were used to calculate the volume of the cocatalyst and the electron density around aluminium. The size of the cocatalyst molecule was found to have a marked effect on the activity of the catalyst: the smaller the cocatalyst the higher the activity. Higher electron density around aluminium increased the randomness of the copolymer.",

author = "J. Koivum{\"a}ki and Sepp{\"a}l{\"a}, {J. V.} and Lauri Kuutti",

year = "1992",

doi = "10.1007/BF00558055",

language = "English",

volume = "29",

pages = "185--191",

journal = "Polymer Bulletin",

issn = "0170-0839",

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T1 - Effect of the cocatalyst on the copolymerization of ethylene and propylene with high activity Ziegler-Natta catalyst

AU - Koivumäki, J.

AU - Seppälä, J. V.

AU - Kuutti, Lauri

PY - 1992

Y1 - 1992

N2 - Ethylene and propylene were copolymerized in n-heptane in the presence of high activity heterogeneous Ziegler-Natta catalyst to study the effect of the cocatalyst on the microstructure and molecular weight of the copolymer. Seven aluminium alkyls of structure Al((CH2)nCH3)3, where n = 0—3, 5, 7 or 11, and one of structure Al(C(CH3)3)3, were used as cocatalysts. The effect of the Al/Ti mole ratio was also studied. Modern molecular modelling techniques were used to calculate the volume of the cocatalyst and the electron density around aluminium. The size of the cocatalyst molecule was found to have a marked effect on the activity of the catalyst: the smaller the cocatalyst the higher the activity. Higher electron density around aluminium increased the randomness of the copolymer.

AB - Ethylene and propylene were copolymerized in n-heptane in the presence of high activity heterogeneous Ziegler-Natta catalyst to study the effect of the cocatalyst on the microstructure and molecular weight of the copolymer. Seven aluminium alkyls of structure Al((CH2)nCH3)3, where n = 0—3, 5, 7 or 11, and one of structure Al(C(CH3)3)3, were used as cocatalysts. The effect of the Al/Ti mole ratio was also studied. Modern molecular modelling techniques were used to calculate the volume of the cocatalyst and the electron density around aluminium. The size of the cocatalyst molecule was found to have a marked effect on the activity of the catalyst: the smaller the cocatalyst the higher the activity. Higher electron density around aluminium increased the randomness of the copolymer.

U2 - 10.1007/BF00558055

DO - 10.1007/BF00558055

M3 - Article

SN - 0170-0839

VL - 29

SP - 185

EP - 191

JO - Polymer Bulletin

JF - Polymer Bulletin

IS - 1-2

ER -

Effect of the cocatalyst on the copolymerization of ethylene and propylene with high activity Ziegler-Natta catalyst

Abstract

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