Abstract
Ethylene-propene copolymerization was carried out with Cp2MCl2 (Cp = cyclopentadienyl), rac-Et(Ind)2MCl2, rac-Me2Si(Ind)2MCl2 (Et = ethylene, Me2Si = dimethylsilyl, Ind = indenyl, M = Zr or Hf)/methylaluminoxane. In the case of using ansa-hafnocenes, the minimum molecular size (extended chain length) of ethylene-propene copolymer was obtained at about 50 mol-% of propene content in the copolymer. The polymerization activity decreased with increase of propene feed ratio in non-bridged non-specific metallocenes. Higher polymerization activities were observed for the copolymerization compared to ethylene and propene homo-polymerization with ansa-isospecific metallocenes. The factor of molecular size lowering was studied by the chain propagation and chain transfer reaction.
| Original language | English |
|---|---|
| Pages (from-to) | 837-851 |
| Number of pages | 15 |
| Journal | Macromolecular Rapid Communications |
| Volume | 18 |
| Issue number | 9 |
| Publication status | Published - 1997 Sep |
| Externally published | Yes |
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ASJC Scopus subject areas
- Materials Chemistry
- Polymers and Plastics
Cite this
Study of molecular size in ethylene-propene copolymerization with zirconocene and hafnocene catalysts. / Naga, Naofumi; Ohbayashi, Yoshiaki; Mizunuma, Kooji.
In: Macromolecular Rapid Communications, Vol. 18, No. 9, 09.1997, p. 837-851.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Study of molecular size in ethylene-propene copolymerization with zirconocene and hafnocene catalysts
AU - Naga, Naofumi
AU - Ohbayashi, Yoshiaki
AU - Mizunuma, Kooji
PY - 1997/9
Y1 - 1997/9
N2 - Ethylene-propene copolymerization was carried out with Cp2MCl2 (Cp = cyclopentadienyl), rac-Et(Ind)2MCl2, rac-Me2Si(Ind)2MCl2 (Et = ethylene, Me2Si = dimethylsilyl, Ind = indenyl, M = Zr or Hf)/methylaluminoxane. In the case of using ansa-hafnocenes, the minimum molecular size (extended chain length) of ethylene-propene copolymer was obtained at about 50 mol-% of propene content in the copolymer. The polymerization activity decreased with increase of propene feed ratio in non-bridged non-specific metallocenes. Higher polymerization activities were observed for the copolymerization compared to ethylene and propene homo-polymerization with ansa-isospecific metallocenes. The factor of molecular size lowering was studied by the chain propagation and chain transfer reaction.
AB - Ethylene-propene copolymerization was carried out with Cp2MCl2 (Cp = cyclopentadienyl), rac-Et(Ind)2MCl2, rac-Me2Si(Ind)2MCl2 (Et = ethylene, Me2Si = dimethylsilyl, Ind = indenyl, M = Zr or Hf)/methylaluminoxane. In the case of using ansa-hafnocenes, the minimum molecular size (extended chain length) of ethylene-propene copolymer was obtained at about 50 mol-% of propene content in the copolymer. The polymerization activity decreased with increase of propene feed ratio in non-bridged non-specific metallocenes. Higher polymerization activities were observed for the copolymerization compared to ethylene and propene homo-polymerization with ansa-isospecific metallocenes. The factor of molecular size lowering was studied by the chain propagation and chain transfer reaction.
UR - http://www.scopus.com/inward/record.url?scp=0031532276&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0031532276&partnerID=8YFLogxK
M3 - Article
VL - 18
SP - 837
EP - 851
JO - Macromolecular Rapid Communications
JF - Macromolecular Rapid Communications
SN - 1022-1336
IS - 9
ER -