Abstract
Ethene and propene polymerizations were carried out with the rac-Me2Si(Ind)2ZrCl2 (Me = CH3, Ind = indenyl)/methylaluminoxane (MAO) catalyst in toluene. The molecular mass distribution index (MMD = M̄w/M̄n) of polypropenes was almost 2,0, while a bimodal MMD was observed for polyethene. The MMD of polyethene was independent of the [Al]/[Zr] ratio and the [Zr] concentration. However, the high molecular weight fraction disappeared when the polymerization was performed either at a low temperature or by using dry MAO. Addition of AlMe3 to the MAO caused an increase of the low molecular weight fraction at the initial stage of polymerization. The low molecular weight fraction was also increased when the polymerization was conducted in a mixture of toluene and CH2Cl2 as the solvent. From these results, the active species formed in the catalyst system are discussed.
| Original language | English |
|---|---|
| Pages (from-to) | 113-118 |
| Number of pages | 6 |
| Journal | Macromolecular Chemistry and Physics |
| Volume | 199 |
| Issue number | 1 |
| Publication status | Published - 1998 Jan |
| Externally published | Yes |
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ASJC Scopus subject areas
- Organic Chemistry
- Physical and Theoretical Chemistry
- Materials Chemistry
- Polymers and Plastics
Cite this
Molecular weight and molecular weight distribution of polyethene obtained with rac-Me2Si(Ind)2ZrCl2/methylaluminoxane. / Naga, Naofumi; Mizunuma, Kooji.
In: Macromolecular Chemistry and Physics, Vol. 199, No. 1, 01.1998, p. 113-118.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Molecular weight and molecular weight distribution of polyethene obtained with rac-Me2Si(Ind)2ZrCl2/methylaluminoxane
AU - Naga, Naofumi
AU - Mizunuma, Kooji
PY - 1998/1
Y1 - 1998/1
N2 - Ethene and propene polymerizations were carried out with the rac-Me2Si(Ind)2ZrCl2 (Me = CH3, Ind = indenyl)/methylaluminoxane (MAO) catalyst in toluene. The molecular mass distribution index (MMD = M̄w/M̄n) of polypropenes was almost 2,0, while a bimodal MMD was observed for polyethene. The MMD of polyethene was independent of the [Al]/[Zr] ratio and the [Zr] concentration. However, the high molecular weight fraction disappeared when the polymerization was performed either at a low temperature or by using dry MAO. Addition of AlMe3 to the MAO caused an increase of the low molecular weight fraction at the initial stage of polymerization. The low molecular weight fraction was also increased when the polymerization was conducted in a mixture of toluene and CH2Cl2 as the solvent. From these results, the active species formed in the catalyst system are discussed.
AB - Ethene and propene polymerizations were carried out with the rac-Me2Si(Ind)2ZrCl2 (Me = CH3, Ind = indenyl)/methylaluminoxane (MAO) catalyst in toluene. The molecular mass distribution index (MMD = M̄w/M̄n) of polypropenes was almost 2,0, while a bimodal MMD was observed for polyethene. The MMD of polyethene was independent of the [Al]/[Zr] ratio and the [Zr] concentration. However, the high molecular weight fraction disappeared when the polymerization was performed either at a low temperature or by using dry MAO. Addition of AlMe3 to the MAO caused an increase of the low molecular weight fraction at the initial stage of polymerization. The low molecular weight fraction was also increased when the polymerization was conducted in a mixture of toluene and CH2Cl2 as the solvent. From these results, the active species formed in the catalyst system are discussed.
UR - http://www.scopus.com/inward/record.url?scp=0001639388&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0001639388&partnerID=8YFLogxK
M3 - Article
VL - 199
SP - 113
EP - 118
JO - Macromolecular Chemistry and Physics
JF - Macromolecular Chemistry and Physics
SN - 1022-1352
IS - 1
ER -