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

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

Research output: Contribution to journalArticleScientificpeer-review

11 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 languageEnglish
Pages (from-to)185-191
Number of pages6
JournalPolymer Bulletin
Volume29
Issue number1-2
DOIs
Publication statusPublished - 1992
MoE publication typeA1 Journal article-refereed

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Ziegler catalyst
copolymerization
propylene
Aluminum
Copolymerization
Propylene
Ethylene
ethylene
aluminum
Catalysts
Carrier concentration
copolymers
Copolymers
Molecular modeling
Heptane
heptanes
molecular weight
Molecular weight
catalysts
microstructure

Cite this

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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",
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Effect of the cocatalyst on the copolymerization of ethylene and propylene with high activity Ziegler-Natta catalyst. / Koivumäki, J.; Seppälä, J. V.; Kuutti, Lauri.

In: Polymer Bulletin, Vol. 29, No. 1-2, 1992, p. 185-191.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

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

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VL - 29

SP - 185

EP - 191

JO - Polymer Bulletin

JF - Polymer Bulletin

SN - 0170-0839

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